Updated on 2024/06/12

写真a

 
Atsushi Iizuka
 
Organization
Research and Development Initiative Institute Professor
Contact information
The inquiry by e-mail is 《here
External link

Degree

  • 工学博士 ( 京都大学 )

Education

  • 1986.3
     

    Kyoto University   doctor course   others

Research History

  • 2024.4 -  

    Chuo University   Research and Development Initiative   professor

  • 2005.4 -  

    Kobe University   Resaarch Center for Urban Safety and Security   Professor

  • 2004.7 -  

    Kobe University   Resaarch Center for Urban Safety and Security   associate professor

  • 1997.4 -  

    Kobe University   Faculty of Engineering   associate professor

  • 1993.12 -  

    Kanazawa University   Faculty of Engineering   associate professor

  • 1988.12 -  

    Kanazawa University   Faculty of Engineering   assistant professor

  • 1986.4 -  

    Kyoto University   Faculty of Engineering   assistant professor

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Professional Memberships

  • 土木学会

  • 地盤工学会

Research Interests

  • Geotechnical engineering

  • Geoenvironmental engineering

  • Geomechanics

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Geotechnical engineering

Papers

  • A constitutive model for swelling properties of unsaturated bentonite buffer materials during saturation Reviewed

    Shinji Ito, Shinya Tachibana, Tomohide Takeyama, Atsushi Iizuka

    Soils and Foundations   62 ( 4 )   101161 - 101161   2022.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.sandf.2022.101161

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  • Separation of the primary and secondary consolidation of freeze-dried clay Reviewed

    H. Ohta, T. Kondo, T. Hashimoto, T. Sakagami, A. Iizuka

    Proc. 20th Int. Conf. Soil Mech. And Geotechnical Engineering   Vol. 2   179   2022.5

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  • Numerical analysis of the axial and radial swelling of unsaturated compacted bentonite Reviewed

    Tachibana, S, Hayashi, D, Ishii, T, Takeyama, T, Iizuka, A

    International Journal of GEOMATE   22 ( 92 )   1 - 8   2022.4

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    DOI: 10.21660/2022.92.1673

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  • 液状水と水蒸気の流れを考慮した不飽和土の連続条件式の定式化

    有井拓也, 橘伸也, 竹山智英, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 26 )   1 - 9   2022.3

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  • 民間企業による国土強靭化への ESG 投資の活用

    野村拓馬, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 26 )   29 - 41   2022.3

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  • 地盤応答解析コードの GPU 並列化

    堂ヶ原健, 竹山智英, 銭谷誠司, 橘伸也, 飯塚 敦

    神戸大学都市安全研究センター研究報告   ( 26 )   10 - 19   2022.3

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  • Automatic Construction of Three-Dimensional Ground Model by Data Processing Reviewed

    Takeyama,T, O-tani,H, Oishi,S, Hori,M, Iizuka,A

    IEEE-ASME TRANSACTIONS ON MECHATRONICS   26 ( 6 )   2881 - 2887   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    There have been attempts to improve the operational efficiency of construction projects and plan response countermeasures for estimated damage following disasters through the utilization of accumulated electronic data, which constructs a digital twin that can reproduce a physical space in cyberspace and feedback the cyberspace simulation results to physical space. However, the application of such simulations is limited, unless numerical models can be automatically constructed from the data. In this study, we develop a program that utilizes a data processing platform to read, transform, and integrate data to create mediated data with a common data structure. This mediated data can be used to construct analytical models for various numerical analyses. Using the program developed, a grid model of 3-D ground surface as the mediated data was constructed based on borehole data obtained through a ground survey. Each grid point has basic material parameters of soil, and these parameters are estimated from borehole data and other investigation reports. Each grid point has general geotechnical parameters and can be easily converted to a 3-D finite-element model. When the borehole data is added or changed, the analytical model can be updated with almost no cost, whereas it would be very costly to create the model manually.

    DOI: 10.1109/TMECH.2021.3105062

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  • Liquefaction risk assessment in the 23 wards of Tokyo using elastoplastic analysis Reviewed

    Honda,K, Takeyama, T. Tachibana,S, Iizuka,A

    International Journal of GEOMATE   21 ( 86 )   48 - 54   2021.10

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    DOI: 10.21660/2021.86.j2270

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  • A procedure to determine material parameters based on borehole data in dynamic analysis Reviewed

    Tomohide Takeyama, Kazuya Honda, Shinya Tachibana, Atsushi Iizuka

    INTERNATIONAL JOURNAL OF GEOMATE   21 ( 85 )   1 - 9   2021.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:GEOMATE INT SOC  

    Recently, the occurrence of large earthquakes has become a concern in Japan, prompting the need for a numerical method that can accurately predict real phenomena, such as the elastoplastic soil-water coupled finite element method. Because the elastoplastic constitutive model requires many material parameters, various soil tests and specialized knowledge are needed to determine these material parameters. In this study, a new method was proposed to determine the material parameters from the limited ground information obtained by borehole inspections and the method was validated by comparing the numerical results with monitored seismic behavior. One-dimensional seismic analyses were conducted using the material parameters estimated from borehole data near the target sites. It was confirmed that the amplitude and predominant period obtained by numerical simulation were consistent with the monitored data. As a result, it was found that the dynamic numerical result was more consistent with the monitored data when the compression index was set to be larger than that in the static analysis.

    DOI: 10.21660/2021.85.j2228

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  • Leaning Pagoda of Ayutthaya Analysis with Three-Dimensional Effects and Ground Uncertainty Reviewed

    Ito,H, Ishida,Y, Sansaard,V, Takeyama,T, Iizuka,A

    International Journal of GEOMATE   20 ( 82 )   161 - 169   2021.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:International Journal of Geomate  

    The pagoda of Wat Krasai, built in the 17th century on the outskirts of the Ayutthaya district in the Kingdom of Thailand, tilts approximately 2 degrees to the north and may continue to tilt further. The cause of this tilt is thought to be the uneven settlement of the foundation ground, but no supporting evidence has been presented. Three cohesive soil layers that may cause uneven settlement have been confirmed in the foundation ground around the pagoda, but soil tests are inadequate, leading to uncertainty in proving the cause of inclination. Hence, the cause of inclination was investigated in this study by calculating the inclination that can occur within the realistic ranges of the soil properties through numerical analysis using the finite element method. A method of correcting plane strain analysis, which has a low computational cost, with a three-dimensional effect coefficient, was utilized to assess over 500 cases considering ground material uncertainties, and the probability distribution of the possible inclinations was calculated. This method is useful as it considers fluctuations in the ground material parameters to address land settlement, which is largely influenced by the three-dimensional effects. This approach will also be applicable to future predictions aimed at pagoda preservation.

    DOI: 10.21660/2021.82.j2108

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  • 盛立ておよび降雨過程における盛土の圧縮挙動の有限要素解析

    難波智徳, 伊藤真司, 橘伸也, 竹山智英, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 25 )   62 - 74   2021.3

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  • 粘土鉱物の変質に起因する間隙水圧の上昇とスロースリップ

    酒井貴寛, 土居優斗, 橘伸也, 竹山智英, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 25 )   51 - 61   2021.3

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  • 土/水/空気連成動的解析を用いたアーチ効果の液状化への影響の解析的検討

    林啓太, 竹山智英, 橘伸也, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 25 )   42 - 50   2021.3

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  • 機械学習による過圧密比の深度分布推定

    陳冉, 竹山智英, 銭谷誠司, 橘伸也, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 25 )   33 - 41   2021.3

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  • 粘土緩衝材を対象とした熱/水/空気/応力連成解析手法の開発

    太田有祐, 伊藤真司, 橘伸也, 竹山智英, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 25 )   22 - 32   2021.3

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  • 自然災害への対峙的な防災・減災からの脱却

    飯塚敦

    神戸大学都市安全研究センター研究報告   ( 25 )   181 - 190   2021.3

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  • 温度勾配による不飽和ベントナイト中の水分移動シミュレーション Reviewed

    有井拓也, 太田有祐, 橘伸也, 竹山智英, 飯塚敦

    Proceedings of the Kansai Geo-Symposium   9   218 - 222   2021

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  • Numerical study on the axial and radial swelling behaviors of unsaturated compacted bentonite Reviewed

    S. Tachibana, D. Hayashi, T. Ishii, T. Takeyama, A. Iizuka

    Proc. of 11th Conference on Geotchnique   2021

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    Publishing type:Research paper (international conference proceedings)   Publisher:Construction Materials & Environment  

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  • 高レベル放射性廃棄物地層処分における性能設計 Reviewed

    飯塚 敦

    原子力バックエンド研究   27 ( 2 )   115 - 118   2020.12

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    Publishing type:Research paper (conference, symposium, etc.)   Publisher:日本原子力学会  

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  • 都市デジタルツインによる防災減災パラダイムシフト Reviewed

    飯塚 敦

    土木構造・材料論文集   ( 36 )   15 - 19   2020.12

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    Publishing type:Research paper (conference, symposium, etc.)   Publisher:九州橋梁・構造工学研究会  

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  • Practical method to estimate parameters of elasto-plasticconstitutive model for unsaturated soils from compaction curve Reviewed

    Shinya Tachibana, Masayoshi Matsumoto, Atsushi Iizuka

    Soils and Foundations   60 ( 5 )   1287 - 1298   2020.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.sandf.2020.08.005

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  • Three-dimensional Effects of Rectangular Embankment Loading Placed on Soft Ground Reviewed

    Ito,H, Iizuka,A, Ohta,H

    International Journal of GEOMATE   19 ( 73 )   148 - 155   2020.9

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    DOI: 10.21660/2020.73.96594

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  • ベントナイトの膨潤圧試験における壁面摩擦の影響に関する数値解析的検討

    小山円香, 伊藤真司, 橘伸也, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 24 )   66 - 76   2020.3

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  • 最適化手法を用いた土/水連成問題に対する分離型解法の収束性に関する研究

    北野井智希, 竹山智英, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 24 )   53 - 65   2020.3

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  • 層間水の脱水による土粒子密度変化を考慮した連続条件式

    前川慎太郎, 岩木友哉, 飯塚敦, 橘伸也

    神戸大学都市安全研究センター研究報告   ( 24 )   34 - 43   2020.3

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  • 室内試験に基づく繰り返し挙動を表現できる構成モデルのパラメータ同定方法

    加藤知彦, 山本百華, 竹山智英, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 24 )   44 - 52   2020.3

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  • ベイズ推定を用いた被害規模予測モデルの改善

    小林宗一郎, 本田和也, 橘伸也, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 24 )   25 - 33   2020.3

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  • せん断強度に基づく飽和度変化に起因する硬化特性の定量的評価

    有井拓也, 林啓太, 橘伸也, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 24 )   18 - 24   2020.3

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  • Constitutive model with a concept of plastic rebound for expansive soils Reviewed

    Shinya Tachibana, Shinji Ito, Atsushi Iizuka

    Soils and Foundations   60 ( 1 )   179 - 197   2020.2

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    DOI: 10.1016/j.sandf.2020.02.007

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  • Extension of unsaturated soil mechanics and its applications Reviewed

    Atsushi Iizuka, Shinya Tachibana, Tomohide Takeyama, Yuri Sugiyama, Shun Nomura, Hideki Ohta

    Geotechnical Research   6 ( 3 )   156 - 176   2019.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ICE Publishing  

    Although the soil, water and air coupling theory has been deductively derived from the three-phase mixture theory, assumptions and interpretations inherent in soil mechanics are also conveniently introduced in this theory. Mechanical properties of unsaturated soils are phenomenologically integrated into the constitutive equation for a deformation problem, with effective stress expressed as a combination of partial stresses acting on each phase of the mixture. The governing equations of two seepage problems describing the movements of pore water and pore air are formulated by a priori introduction of Darcy's law. Consequently, the coupling theory consists of a deformation problem and two seepage problems, in which the soil-water retention characteristics play the role of a mediator connecting these problems. If the theoretical structure is clarified in this way, an extension of this theory is easily made. In this paper, the extension of the theory to each of four examples and their performance is demonstrated. The features of settlement caused by absorption of soil water due to vegetation; dissolution, advection and diffusion of substances in groundwater; desaturation and state change due to vaporisation of dissolved gas from pore water; and the liquefaction potential of unsaturated soil are presented.

    DOI: 10.1680/jgere.18.00004

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  • The Risk of Liquefaction Associated with Water Head Fluctuation in the Low-lying Area of Tokyo Reviewed

    Tomohide Takeyama, Kazuya Honda, Atsushi Iizuka

    Journal of Civil Engineering and Construction   8 ( 2 )   41 - 47   2019.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Tech Reviews Ltd  

    In the wide area of the eastern part of Tokyo, the ground level is less than mean sea level. This area is more vulnerable to disasters than other areas. If large flood damage such as storm surge should occur in this area, the disaster would be a long-term catastrophe. On the coast of Tokyo Bay, countermeasures have been taken by tide embankments and floodgates. However, considering the damage scale when it occurs, an analysis in this area is very important. In this area, ground settlement occurred and groundwater head dropped because groundwater excessively withdrew by the industrial purpose during the period of economic growth. Currently, the groundwater head recovers and the ground settlement has been subsided. However, due to the groundwater head fluctuation, pore water pressure distribution had been different from hydrostatic pressure distribution. Therefore, in the analysis in this area, it is necessary to consider past groundwater head fluctuation. In this research, the ground settlement and the distribution of pore water pressure are simulated from groundwater level fluctuation over the past 100 years. Then, we conducted the seismic analysis by input the distribution of effective stress calculating from the simulated ground water pressure. The sites analyzed in this research are Tokyo Sea Life Park at the mouth of Arakawa River.

    DOI: 10.32732/jcec.2019.8.2.41

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  • Elasto-plastic modelling of shear failure of the plate boundary decollement zone Reviewed

    Y Sugiyama, S Tachibana, H Sakaguchi, A Iizuka

    Geophysical Journal International   216 ( 3 )   1890 - 1900   2019.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Oxford University Press (OUP)  

    DOI: 10.1093/gji/ggy499

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  • 深海底プレート境界デコルマ帯を想定した過圧密化の発現

    上原 拓真, 飯塚 敦, 橘 伸也, 杉山 友理

    都市安全研究センター研究報告   ( 23 )   26 - 36   2019.3

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  • 不飽和土の締固め曲線と硬化則の関連性について

    松本 昌祥, 橘 伸也, 飯塚 敦

    都市安全研究センター研究報告   ( 23 )   37 - 54   2019.3

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  • Application of partitioned iterative coupling approach to multi-physics Reviewed

    Takeyama, T, Tachibana, S, Kitanoi, T, Iizuka, A

    Journal of Civil Engineering and Construction   8 ( 1 )   13 - 18   2019.2

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    DOI: 10.32732/jcec.2019.8.1.13

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  • ベイズ推定を用いた被害予測と死亡者数再現関数の検討 Reviewed

    75 ( 1 )   31 - 39   2019

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:土木学会  

    DOI: 10.2208/jscejsp.75.31

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  • Solute transfer during consolidation based on a solid-fluid-solute coupling model Reviewed

    Nomura, Shun, Kawai, Katsuyuki, Tachibana, Shinya, Iizuka, Atsushi

    INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS   42 ( 10 )   1172 - 1196   2018.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY  

    The migration of contaminant through soil is usually modeled using the advection-dispersion equation and assumes that the porous media is stationary without introducing a constitutive equation to represent soil structure. Consequently, time-dependent deformation induced by soil consolidation or physical remediation is not considered, despite the need to consider these variables during planning for the remediation of contaminated ground, the prediction of contaminated groundwater movement, and the design of engineered landfills. This study focuses on the numerical modeling of solute transfer during consolidation as a first step to resolve some of these issues. We combine a coupling theory-based mass conservation law for soil-fluid-solute phases with finite element modeling to simulate solute transfer during deformation and groundwater convection. We also assessed the sensitivity of solute transfer to the initial boundary conditions. The modeling shows the migration of solute toward the ground surface as a result of ground settlement and the dissipation of excess pore water pressure. The form of solute transport is dependent on the ground conditions, including factors such as the loading schedule, contamination depth, and water content. The results indicate that an understanding of the interaction between coupling phases is essential in predicting solute transfer in ground deformation and could provide an appropriate approach to ground management for soil remediation.

    DOI: 10.1002/nag.2787

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  • Analytical investigation of disturbance of seabed-sampled soil specimens and its influence on unconfined strength Reviewed

    Sugiyama Yuri, Tachibana Shinya, Sakaguchi Hide, Iizuka Atsushi

    Soils and Foundations   Vol.58 ( No.3 )   pp.689 - 701   2018

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japanese Geotechnical Society  

    In view of the need to utilize ocean space and to develop seabed resources, the assessment of the stability of deep seabed soil has emerged as an important challenge in the field of geomechanics. To study seabed stability, the strength and stiffness of the natural ground must be ascertained. Accordingly, it is necessary either to conduct laboratory testing on soil specimens sampled from the seabed or to estimate the strength and stiffness by in-situ tests. While in the future it may be reasonable to conduct in-situ tests to estimate the stiffness and strength of seabed soil, it will still be necessary to compare the physical properties measured by in-situ testing with those measured by laboratory testing in advance of these determinations. In short, soil specimens must be sampled from the actual deep seabed, and laboratory mechanical tests must be conducted on the sampled soil specimens. However, soil sampled from the ocean bottom is subject to effects that differ from those exerted on soil sampled from the earth. More specifically, the non-negligible effects of disturbance are expected with soil sampled from the ocean bottom. The effects of disturbance occur during the sampling process due to the vaporization of dissolved gases, as these soil specimens are under relatively higher pressure and contain pore water with a high amount of dissolved gases. Therefore, numerical simulations were conducted in the present study to investigate the effects of vaporized dissolved gases on the mechanical behavior of soil specimens during sampling and on the undrained shear strength as determined by laboratory tests. The analyses revealed that the combination of the decreasing effective stress caused by the sampling and factors such as overconsolidation and unsaturation is attributable to the difference between the soil strength ascertained by laboratory testing and the in-situ soil strength.

    DOI: 10.1016/j.sandf.2018.02.026

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  • Numerical analysis of vacuum consolidation considering dissolved gasses Reviewed

    Nagaura, T, Sugiyama, Y, TAKEYAMA TOMOHIDE, IIZUKA ATSUSHI

    Proceedings of the 7th International Conference on Unsaturated Soils   2018

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  • Finite strain finite element formulation of coupled solid-fluid mixture for dynamic problems Reviewed

    Bhuddarak Charatpangoon, Aiko Furukawa, Junji Kiyono, Shinya Tachibana, Tomohide Takeyama, Atsushi Iizuka

    International Journal of GEOMATE   15 ( 51 )   1 - 8   2018

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:GEOMATE International Society  

    Currently, finite element codes for small-strain have been widely applied in geotechnical engineering problems. However, the limitations of these codes are recognized, especially when the strain is large. To overthrow such limitations, finite-strain finite element code for porous media is needed. Therefore, this study aims to implement the finite element code for coupled solid-fluid at finite strain for static and dynamic problems. Firstly, the governing equation for porous media at finite-strain was introduced. Then, the mixed formulation of both phases with respect to the reference coordinates by deriving the governing equations with respect to the reference or current coordinates and by considering the solid and fluid as separate, was given. At present, the code is developed only for elastic regime as its preliminary step. In this study, the proposed code has been verified with the static and dynamic problem. And, the result of the finite-strain finite element code is then compared with the result of the analytical solution and small-strain finite element code within the small-strain regime. Thereafter, the proposed code was used to estimate the response of the earthen dam when subjected to a dynamic load. Finally, the results, discussion, and comparison between small- and finite-strain finite element analyses were presented.

    DOI: 10.21660/2018.51.86896

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  • Evaluation of specific surface area of bentonite-engineered barriers for Kozeny-Carman law Reviewed

    I. Kobayashi, H. Owada, T. Ishii, A. Iizuka

    SOILS AND FOUNDATIONS   57 ( 5 )   683 - 697   2017.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPANESE GEOTECHNICAL SOC  

    The impermeability of bentonite is dependent on montmorillonite microstructures and varies with chemical alteration caused by related changes. The Kozeny-Carman equation is viewed as a rational hydraulic model for bentonite because it incorporates microstructure parameters such as specific surface area in addition to macrostructure parameters such as the void ratio. In the study reported here, a technique for measuring the specific surface area of compacted bentonite under constant volume conditions using X-ray diffraction was developed, and the hydraulic conductivity of various bentonite materials was evaluated based on the measurements thus obtained. The applicability of the Kozeny-Carman hydraulic model for evaluation of impermeability of bentonite was clarified. (C) 2017 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.

    DOI: 10.1016/j.sandf.2017.08.001

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  • Simulation of saturation process in a transuranium disposal facility Reviewed

    Yusuke Takayama, Atsushi Iizuka, Katsuyuki Kawai

    Environmental Geotechnics   4 ( 5 )   339 - 352   2017.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ICE Publishing  

    Bentonite materials have been considered as a candidate material for engineered barriers in transuranium (TRU) waste disposal facilities due to their physical and chemical characteristics. Bentonite materials will be initially compacted and unsaturated. After closing the cavern, the bentonite material will become saturated through exposure to a percolating groundwater. It is therefore important to understand the behaviour of bentonite during saturation, which provides an initial condition of the disposal facilities. This paper explains a mathematical model which can express the saturation process. Subsequently, a series of numerical simulations were carried out. First, the swelling pressure of buffer and backfill was examined to verify the numerical model. It was confirmed that the simulated swelling pressure rises with water absorption, and swelling pressure test results from the literature are shown to be satisfactorily predicted by the numerical model, although these were slightly overestimated. Next, the mechanical behaviour of bentonite materials in a TRU waste disposal facility during the saturation process was examined using soil/ water/ air coupled finite-element method. Although it is difficult to examine the validity of analysis results because of the difficulty of an extremely long-term measurement, the qualitative behaviour of the saturation process could be inferred.

    DOI: 10.1680/jenge.14.00041

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  • TC106 General Report; Unsaturated Soils Reviewed

    Iizuka,A, Tachibana,S

    Proc. 19th International Conference on Soil Mechanics and Geotechnical Engineering   pp.1113 - 1120   2017.9

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  • H-M-C coupling analysis considering several scenarios of long-term alteration in cement-bentonite system Reviewed

    Tachibana, S, Ito, S, Iizuka, A, Owada, H, Hayashi, D

    Proc. of 2nd Annual Workshop of the Cebama Project   2017.5

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  • B 値に与える影響因子とB 値測定手法がせん断挙動に及ぼす影響

    宇治 亮佑, 杉山 友理, 竹山 智英, 飯塚 敦

    都市安全研究センター研究報告   ( 21 )   49 - 62   2017.3

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  • 地盤動的解析のための試験結果のばらつきを考慮したパラメータ範囲の検討

    鹿瀬 一希, 飯塚 敦, 竹山 智英

    都市安全研究センター研究報告   ( 21 )   27 - 35   2017.3

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  • 海底地盤におけるサンプリング時の応力解放に伴う乱れに関する検討

    岡田 真理子, 杉山 友理, 橘 伸也, 飯塚 敦

    都市安全研究センター研究報告   ( 21 )   36 - 48   2017.3

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  • 化学変質を考慮したベントナイト緩衝材の長期挙動評価

    神藤 卓哉, 飯塚 敦, 橘 伸也

    都市安全研究センター研究報告   ( 21 )   83 - 90   2017.3

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  • デコルマ帯における変質を考慮したせん断挙動モデル

    妹川 賢司, 杉山 友里, 飯塚 敦

    都市安全研究センター研究報告   ( 21 )   73 - 82   2017.3

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  • ジオテキスタイル補強土の補強効果の評価手法

    織田 裕至, 飯塚 敦, 橘 伸也

    都市安全研究センター研究報告   ( 21 )   63 - 72   2017.3

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  • Constitutive modeling for compacted bentonite buffer materials as unsaturated and saturated porous media Reviewed

    Yusuke Takayama, Shinya Tachibana, Atsushi Iizuka, Katsuyuki Kawai, Ichizo Kobayashi

    SOILS AND FOUNDATIONS   57 ( 1 )   80 - 91   2017.2

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    Bentonite has remarkable swelling characteristics and low permeability that enhance the stability of the buffer materials in repositories for the geological disposal of radioactive waste. It is necessary to apply reliable numerical simulation techniques to assess the safety and mechanical stability of repositories over a long period of time. Having a constitutive model that can describe the mechanical behavior of bentonite is key to such numerical simulations. This paper proposes an elasto-plastic constitutive model to describe the changes in the mechanical properties of bentonite due to saturation in the progress of a repository becoming submerged under groundwater. In the proposed model, the swelling index is formulated as a function of the degree-of-saturation to express not only the swelling behavior, but also the dependency of the degree-of-saturation on the dilatancy characteristics. The montmorillonite content is used as a material parameter to determine the normal consolidation line. The experimental results of swelling volume and swelling pressure tests in previous literature are shown to have been satisfactorily predicted by the proposed model. (C) 2017 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.

    DOI: 10.1016/j.sandf.2017.01.006

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  • Research activities at RWMC on the bentonite re-saturation process (2) Laboratory and numerical evaluation Reviewed

    Ito, S, Tachibana, S, Sakai, J, Iizuka, A, Kobayashi, I. Ishii, T, Kawakubo, M

    BEACON Initial Workshop   2017

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  • Elastoplastic prediction of clay-buffer homogenization due to swelling behavior Reviewed

    Tachibana, S, Ito, S, Sakai, J, Iizuka, A, Ishii, T, Kawakubo, M, Kobayashi, I

    7th International Conference on Clays in Natural and Engineered Barriers for Radioactive Waste Confinement   2017

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  • 地層処分施設内における温度・密度・飽和度を考慮したベントナイト緩衝材の力学特性 Reviewed

    Vol.12   567 - 570   2017

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  • 水質の違いによるベントナイトの膨潤特性 Reviewed

    Vol.12   557 - 560   2017

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  • 解析による施工時期の違いが盛土の初期応力に与える影響 Reviewed

    金澤 伸一, 五十嵐 日菜, 飯塚 敦

    土木学会論文集 A2 (応用力学)   73 ( 2 )   I_489 - I_496   2017

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  • Effect of selection of secondary minerals on H-M-C coupling calculation Reviewed

    Owada,H, Hayashi,D, Iizuka,A

    Proceedings of the First Annual Workshop of the HORIZON 2020 CEBAMA Project   269 - 274   2017

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    DOI: 10.5445/KSP/1000068889

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  • Detailed FE analysis of E-Defense shake table test on soil-underground structure Reviewed

    Pal,M.K, Yamashita,T, Ohno,S, Iizuka,A

    Proc. of Computational Engineering Conference JSCE   Vol.22   2017

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  • Expression of air pressure distribution using soil/water/air coupled analysis Reviewed

    Kawai, K, Kawakatsu,T, Iizuka,A

    Proc. of 6th Int. Conf. GEOMATE 2016   233 - 238   2016.11

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  • Effects of stress conditions on B-value measurement Reviewed

    Sugiyama, Yuri, Kawai, Katsuyuki, Iizuka, Atsushi

    SOILS AND FOUNDATIONS   56 ( 5 )   848 - 860   2016.10

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    The B-value, measured after setting up a specimen for triaxial testing, is used for evaluating the degree of saturation of a specimen. However, the stress conditions used when measuring the B-value have not been standardized. Although some experimental approaches have been pursued, no detailed analyses have evaluated the effects of the measurement conditions on the B-value results. In this study, the B-values of nearly saturated specimens under various stress conditions were investigated, using a smart triaxial test apparatus capable of elaborate stress control, and comparisons among measurement results were conducted. Moreover, by applying Henry's law, which governs the dissolution of the gas phase into the liquid phase, to an existing constitutive model for unsaturated soil, a new soil model was proposed. This new model accurately represents the behaviors of pore air even under nearly saturated conditions. In addition, the effects of the stress conditions on the B-values were investigated through numerical simulations of B-value measurements. (C) 2016 The Japanese Geotechnical Society. Production and hosting by Elsevier B.V.

    DOI: 10.1016/j.sandf.2016.08.009

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  • 放射性廃棄物の地下空洞型物処分施設に用いる側部低透水層の転圧工法による施工品質の評価 Reviewed

    山田 淳夫, 千々松 正和, 秋山 吉弘, 小峯 秀雄, IIZUKA ATSUSHI

    土木学会論文集C (地圏工学)   72 ( 2 )   164 - 178   2016.6

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  • 応力条件がB値計測に及ぼす影響

    田中 博之, 杉山 友理, IIZUKA ATSUSHI

    都市安全研究センター研究報告   ( 20 )   18 - 31   2016.3

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  • 海底地盤からのサンプリングに伴う応力変化が強度特性に及ぼす影響

    中谷 奈央, 杉山 友理, IIZUKA ATSUSHI

    都市安全研究センター研究報告   ( 20 )   32 - 39   2016.3

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  • Soil/water/air coupled F. E. simulation of phreatic surface generation process within a river levee Reviewed

    Kawai,K, Phommachanh,V, Iizuka,A

    Japanese Geotechnical Society Special Publication (The 15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering)   2 ( 49 )   p. 1714 - 1717   2016.1

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    In this study, the generation process of the phreatic surface within a river levee is investigated through soil/water/air coupled simulation. Here, the effects of river level fluctuation and rainfall on changes in soil moisture distribution within a river levee are considered. The constitutive model proposed by Ohno et al.1) is formulated to the initial and boundary value problems in accordance with Borja's multi phases' concept and is used for simulation. Consequently, it is first found that high groundwater level is maintained for ground consisting of low permeability and high soil water retentivity. Moreover, it is found that the fluctuation of river level directly influences the phreatic surface, and that, in contrast, the effect of rainfall appears after a time lag.

    DOI: 10.3208/jgssp.JPN-078

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  • Explanation of Dry Density Distribution Induced by Compaction through Soil/Water/Air Coupled Simulation Reviewed

    Kawai, Katsuyuki, Phommachanh, Viradeth, Kawakatsu, Takuya, Iizuka, Atsushi

    ADVANCES IN TRANSPORTATION GEOTECHNICS III   143   276 - 283   2016

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    Most onshore earth structures, such as earthen dams, embankment, and river levees, are constructed by compaction. Transportation geotechnics also includes construction of compacted earth structures, such as road and railway embankment. Optimum compaction can increase shear strength, while decreasing compressibility and permeability of earth structures. For this reason, compaction has been used for earthworks since the dawn of times. Generally, a series of lab compaction tests is conducted to obtain a compaction curve before constructing these structures. The shape of the compaction curve, which determines the maximum dry density at the optimum water content, is very important in the design and construction of structures. However, it is difficult to control compaction quality on the basis of lab tests alone, as soil materials are inhomogeneous. Furthermore, there are differences in the compaction methods used in lab tests and at construction sites. Therefore, it is necessary to explain the mechanisms of compaction in the framework of soil mechanics. In this study, compaction of earthworks is simulated in a similar way. The effect of compaction layer thickness and the number of compaction layers on the distribution of dry densities in an earth structure was investigated through soil/water/air coupled simulation. Consequently, it was found that multi-layered compaction can create a gap in the dry density between two layers and that this gap can be reduced by thinner layer compaction. On the other hand, though the average dry density in a compacted earth structure can be increased by increasing the number of compacted layers, some gap between compaction layers was inevitable. Through these findings, this study contributes to the performance design of compacted earth structures.

    DOI: 10.1016/j.proeng.2016.06.035

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  • 木造低層住宅の地震時における完全倒壊を防止するための屋外設置フレームの提案 Reviewed

    太田 秀樹, 清田 泰行, 菅原 禎, 畠山 寛之, 中村 勝則, 飯塚 敦

    地盤工学シンポジウム論文集   Vol.60   pp.213 - 216   2016

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  • Influence of stress release after sampling on shear characteristics Reviewed

    Sugiyama,Y, Kawai,K, Iizuka,A, Nakatani,N

    Proc. of Int. Conf. on Soft Ground Engineering   pp.553 - 559   2015.12

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  • 廃砂堆積場の表面止水層性能評価

    生田勇輝, 岡田真理子, 飯塚 敦

    都市安全研究センター研究報告   ( 19 )   10 - 27   2015.3

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  • 放射性廃棄物地層処分におけるベントナイト緩衝材の変質評価手法の開発

    樋野隆太, 飯塚敦

    都市安全研究センター研究報告   ( 19 )   28 - 44   2015.3

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  • 深海底デコルマ帯におけるせん断破壊モデル

    戎健次, 杉山友理, 飯塚敦, 河井克之, 佐々木陽亮

    都市安全研究センター研究報告   ( 19 )   45 - 58   2015.3

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  • 弾塑性動的地盤モデルのためのパラメータの同定

    吉富力, 妹川賢司, 飯塚敦, 河井克之, ロハニ タラニディ

    都市安全研究センター研究報告   ( 19 )   85 - 100   2015.3

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  • 粒度分布に注目した土粒子吸着物質の除去方法の検討

    西門優, 飯塚敦, 河井克之

    都市安全研究センター研究報告   ( 19 )   75 - 84   2015.3

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  • 土/水/空気連成解析によるキャピラリーバリアシステムの性能評価

    中村翔一, 河井克之, 飯塚敦

    都市安全研究センター研究報告   ( 19 )   67 - 74   2015.3

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  • ベルセロ法を用いた高容量テンシオメータの開発

    松尾直人, 飯塚敦, 河井克之

    都市安全研究センター研究報告   ( 19 )   59 - 66   2015.3

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  • STUDY ON THE DEPLOYMENT MODEL OF DMAT IN ACUTE DISASTER MEDICAL Reviewed

    KOTANI Minoru, IIZUKA Atsushi, KAWAI Katsuyuki

    Journal of Japan Society of Civil Engineers, Ser. F6 (Safety Problem)   71 ( 1 )   32 - 45   2015

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    &nbsp;In recent years, enormous damage has been caused by natural disasters. Disaster Medical Assistance Team (DMAT) play an important role in minimizing human suffering. However, since factual information is intermingled with disinformation in the event of a disaster, it is difficult to obtain correct information, such as where and to what extent medical care is required, in order to dispatch DMAT appropriately. In this study, using a victims estimation formula empirically derived from the cumulative death toll data with the passage of time in past seismic hazard, an optimization problem was addressed to minimize the number of deaths.<br>&nbsp;Consequently, it was found that early dispatch of DMAT would be effective, and DMAT should be dispatched according to the circumstances (number of DMAT, conditions of affected areas) in order to minimize the cumulative death toll. And, by setting the conditions of the affected area, it was possible to consider the way of reasonable DMAT dispatch. Thus, it has become possible to suggest the way of effective dispatch of finite DMAT, to use limited DMAT resources efficiently, and to help make decisions.

    DOI: 10.2208/jscejsp.71.32

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  • BAYESIAN ESTIMATION OF THE VICTIMS NUMBER INFORMATION USING THE WEIBULL DISTRIBUTION Reviewed

    KOTANI Minoru, IIZUKA Atsushi, KAWAI Katsuyuki

    Journal of Japan Society of Civil Engineers, Ser. F6 (Safety Problem)   71 ( 1 )   46 - 57   2015

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    &nbsp;Decision makers must decide the disaster correspondence by using uncertain information. When the decision maker makes this decision, they have the dilemma to prioritize which of &ldquo;the rapidity of correspondence&rdquo; and &ldquo;the accuracy of information&rdquo;. The result for disaster varies according to the difference in priority.<br>&nbsp;This study approximate the change of cumulative number of death with time lapse by using the Weibull distribution and proposed the Bayesian estimation model to predict the total number of deaths by utilizing the change of cumulative number of deaths. By considering the estimated total number of deaths with past earthquakes cases, it was possible to estimate the time period to make the disaster response decision. Therefore, this would be a judgment material to reduce the dilemma of decision makers.

    DOI: 10.2208/jscejsp.71.46

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  • ANALYSIS STUDY AN EMBANKMENT MODEL WITH DRAINAGE Reviewed

    Shin-ichi KANAZAWA, Shinya TACHIBANA, Atsushi IIZUKA

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   71 ( 2 )   I_429 - I_436   2015

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    DOI: 10.2208/jscejam.71.i_429

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  • 降雨時における傾斜地盤内空気の挙動について Reviewed

    川勝 拓哉, 河井 克之, TIWARI Binod, 飯塚 敦

    土木学会論文集A2(応用力学)   71 ( 2 )   I_171 - I_180   2015

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    DOI: 10.2208/jscejam.71.I_171

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  • 放射性廃棄物の地下空洞型処分施設に用いる底部低透水層の転圧工法による施工品質の評価 Reviewed

    山田 淳夫, 千々松 正和, 藤原 斉郁, 矢田 勤, 秋山 吉弘, 小峯 秀雄, IIZUKA ATSUSHI

    土木学会論文集 C (地圏工学)   71 ( 3 )   147 - 162   2015

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    As for the low permeable layer, important functions are expected as an engineered barrier of radioactive waste disposal for low-level waste with comparatively high radiation levels. On examining the construction methods of this low permeable layer, it is important to confirm the possibility of the construction in the conditions similar to the actual constructed conditions with a true scale size. Therefore, the construction examination for the bottom part of the low permeable layer by bentonite and the performance check test of the buffer layer were carried out. The result of the construction examination showed that the possibility of the construction were confirmed, and the result of performance check test showed that it was possible to ensure the required performance of the low permeable layer, such as hydraulic conductivity.

    DOI: 10.2208/jscejge.71.147

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    Other Link: https://jlc.jst.go.jp/DN/JLC/20013233950?from=CiNii

  • 深海底プレート境界デコルマ帯におけるせん断破壊モデル Reviewed

    杉山 友理, 戎 健次, 飯塚 敦, 河井 克之, 佐々木 陽亮

    土木学会論文集A2(応用力学)   71 ( 2 )   I_605 - I_612   2015

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  • Numerical simulation of saturation process in TRU disposal facility Reviewed

    Y. Takayama, R. Hino, A. Iizuka, K. Kawai

    Computer Methods and Recent Advances in Geomechanics   409 - 414   2014.9

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    Due to its low permeability and excellent expansion characteristics, bentonite materials are considered to be the engineered barrier in Trans-Uranium (TRU) disposal facility. It is necessity to predict the mechanical behavior of bentonite using numerical simulation to evaluate the long-term performance of TRU disposal facility. In this paper, we simulated the saturation process of bentonite materials in TRU disposal facility from an initially unsaturated state. And we examined the mechanical behavior of bentonite buffer during the saturation process. This simulation result shows that Disposal waste is moved upward due to the difference of swelling pressure between buffer and backfill. And the facility existed in unsaturated state even under steady state conditions due to the entrapped air.

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  • Expression of the pore-pressure coefficient B with numerical simulation Reviewed

    Y. Sugiyama, H. Tanaka, K. Kawai, A. Iizuka

    Computer Methods and Recent Advances in Geomechanics   403 - 408   2014.9

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    Undrained shear strength is used for estimating the bearing resistance of foundations and the safety factor of a slope. For this test, the pore-pressure coefficients, namely A and B as proposed by Skempton, are available. These coefficients can be obtained from the undrained triaxial test. According to Terzaghi's effective stress theory, the B-value must be 1.0 in a saturated soil. Therefore, a B-value of 1.0 is used as the target for saturating a specimen. However, it is difficult to achieve a B-value of 1.0 in the triaxial test. Because of this, a specimen with a B-value greater than 0.95 is regarded as saturated. The relationship between saturation and the B-value is still not clear. In this study, the factors influencing the B-value were numerically investigated with a soil/water/air coupled model that considers the solvability of pore-air to pore-water. Consequently, the pore-water pressure behavior, which depends on the initial degree of saturation and initial stress conditions, could be expressed.

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  • Application of soil/water/air coupled FE code to predict seepage and deformation on sandy slope Reviewed

    V. Phommachanh, N. Matsuo, K. Ienaga, K. Kawai, A. Iizuka, B. Tiwari

    Proc. International Conference on Unsaturated Soils: Research and Applications (UNSAT2014)   Vol.1   621 - 627   2014.7

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    In order to study the triggering factors for shallow landslides during rainfall, sandy soil slopes were prepared in laboratory angles of 30 and 45 degrees and those slopes were poured with rainfall intensities of 30 and 60 mm/hours through a specially developed rain simulator. Moreover, the rainfall on slope was simulated with using unsaturated soil/water/air coupled F.E. code, and the numerically calculated depth of water front and values of suction at different location in the slopes at various angles of inclinations matched well with the experimentally observed values. The combined results obtained with the numerical and experimental studies were utilized to predict the variation in the depth of water and values of suction at different intensities of rainfall as well as deformation of slopes during rainfall.

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  • Derivation of mass transfer model for unsaturated soil and its applications Reviewed

    S. Nomura, Y. Sugiyama, K. Kawai, A. Iizuka

    Proc. International Conference on Unsaturated Soils: Research and Applications (UNSAT2014)   Vol.2   1179 - 1187   2014.7

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    In this study, we use conservation laws to construct a method for describing the movement of dissolved material. This is then applied to a mathematical model. Recently, soil pollution, induced by toxic materials in the ground water, is spreading. The mobility modes for this dissolved material can be divided into advection, induced by distribution of fluid head, and dispersion, induced by distribution of concentration content. First, Darcy's law is derived from the momentum conservation law using Bear's theory. Secondly, the concept of total fluid head is extended for application to various fluids. Additionally, an infiltration equation and an advection-dispersion equation are derived from mass conservation laws. Coupling the two equations, we construct a mass transfer model for unsaturated/saturated ground. Using the model, the effect of density flow is considered assuming basic one-dimensional areas. The results show that mobility of the dissolved material depends on its density. We concluded that density flow dominates along the vertical rather than the horizontal direction and mobility of the fluid is dulled in the unsaturated area.

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  • Compaction simulation with soil/water/air coupled FEA code and parametric study Reviewed

    K Kawai, V Phommachanh, S Sakamoto, A Iizuka

    Proc. International Conference on Unsaturated Soils: Research and Applications (UNSAT2014)   1   545 - 552   2014.6

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    DOI: 10.1201/b17034-76

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  • Numerical evaluation of a multiple soil barrier system preventing water infiltration Reviewed

    Y Takayama, Y Ikuta, A Iizuka, K Kawai, T Taki, R Sakao, Y Ichikawa

    Proc. International Conference on Unsaturated Soils: Research and Applications (UNSAT2014)   1   659 - 665   2014.6

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    DOI: 10.1201/b17034-91

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  • マルチング材料としての粉砕汚泥焼成煉瓦の有効活用について Invited Reviewed

    河井克之, 佐伯拓也, 野村瞬, 杉山友理, 飯塚敦

    骨材資源   185   13 - 23   2014.4

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  • 間隙気体の溶解を考慮した不飽和力学モデル

    杉山 友理, 田中 博之, 飯塚 敦, 河井 克之

    都市安全研究センター研究報告   ( 18 )   32 - 39   2014.3

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    DOI: 10.24546/81011440

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  • 土/水/空気/溶解物質連成有限要素解析プログラムを用いた塩害抑制手法の検討

    田中 琢, 飯塚 敦, 河井 克之

    神戸大学都市安全研究センター研究報告   ( 18 )   44 - 53   2014.3

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    DOI: 10.24546/81011442

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  • 土の粒度分布に注目した放射性物質吸着土壌の減容化に関する検討

    吉井 大貴, 西門 優, 飯塚 敦, 河井 克之

    都市安全研究センター研究報告   ( 18 )   40 - 43   2014.3

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    DOI: 10.24546/81011441

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  • 長期化学的変質を考慮したベントナイト緩衝材の力学モデル化

    鶴見 修平, 飯塚 敦, 河井 克之

    都市安全研究センター研究報告   ( 18 )   23 - 31   2014.3

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    DOI: 10.24546/81011439

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  • Coupled Hydraulic-Mechanical-Chemical Modeling for Cement-Bentonite Barrier System (2) Mechanical Modeling of Bentonite Engineered Barrier in Consideration of Long Term Chemical Alteration Reviewed

    Takayama,Y, IIZUKA ATSUSHI, Ohwada,H, Ishii,T, Kobayashi,I

    Proc. International Conference on the Performance of Engineered Barriers: Backfill, Plugs & Seals, Physical and Chemical Properties, Behaviour & Evolution   2014.2

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  • Effect of montmorillonite content on mechanical and hydraulic properties of bentonite and its numerical modelling Reviewed

    Yusuke Takayama, Shuhei Tsurumi, Ichizo Kobayashi, Hitoshi Ohwada, Tomoko Ishii, Ryoji Yahagi, Atsushi Iizuka

    CLAYS IN NATURAL AND ENGINEERED BARRIERS FOR RADIOACTIVE WASTE CONFINEMENT   400   221 - 235   2014

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    Recently, the hydraulic/mechanical/chemical (HMC) analytical method has been studied with the aim of evaluating the long-term performance of Trans-Uranium (TRU) geological repositories. In this particular research, the hydraulic/mechanical modelling of bentonite materials for HMC analyses has been studied, with bentonite materials considered as the engineered barrier. It is said that the bentonite material in the TRU disposal facilities is altered chemically by cement leachate. Moreover, there is a concern that chemical alteration changes the expansion characteristics and water permeability of the bentonite material. In this paper, using past test results, the influence of montmorillonite content and the exchange of sodium and calcium ions on mechanical and hydraulics behaviour is examined. Hydraulic/mechanical mathematical modelling is also presented, describing the mechanical behaviour of bentonite from an initially unsaturated state while also taking into account the hydraulic and mechanical characteristics of bentonite mentioned above. We also simulate the saturation process from an initially unsaturated state in a TRU disposal facility, which is modelled one-dimensionally.

    DOI: 10.1144/SP400.13

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  • 東名牧の原盛土の崩壊時強度の推定と今後の維持管理への提言

    森山 陽一, 藤岡 一頼, 木村 勝, 石垣 勉, 林 雄介, IIZUKA ATSUSHI, 齋藤 邦夫, 太田 秀樹

    地盤工学シンポジウム論文集   Vol.59   pp.163 - 170   2014

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  • THEORETICAL INTERPRETATION OF THE PORE PRESSURE COEFFICIENT B WITH SOIL/WATER/AIR COUPLED MODEL Reviewed

    SUGIYAMA Yuri, KAWAI Katsuyuki, TANAKA Hiroyuki, IIZUKA Atsuhi

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   70 ( 2 )   I_145 - I_153   2014

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    The pore pressure coefficient B, which is measured on triaxial test, is useful for evaluating degree of saturation of specimen. However, the influential factors on this B value other than degree of saturation have not been investigated in detail up to now. In this study, first, Henry's law that indicates dissolved air in pore water was applied to the existing constitutive model for unsaturated soil in order to express the behavior of pore air on unsaturated soil extremely close to fully saturated state. Next, the influential factors, such as degree of saturation, confining stress and back pressure, were investigated through numerical simulations with using newly obtained model. Consequently, it was found out that B value depends on not only degree of saturation but also stress state.

    DOI: 10.2208/jscejam.70.I_145

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  • 新しい三軸試験装置の紹介 : SMART triaxial testing apparatus

    小林 一三, 中山 栄樹, 飯塚 敦, 太田 秀樹

    地盤工学シンポジウム論文集   Vol.59   pp.115 - 120   2014

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  • Salt damage and soil contamination caused by the east Japan earthquake and Tsunami Reviewed

    Yuri Sugiyama, Shun Nomura, Atsushi Iizuka, Katsuyuki Kawai, Shinya Tachibana, Shin Ichi Kanazawa, Tomohide Takeyama

    Theoretical and Applied Mechanics Japan   62   141 - 148   2014

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    The East Japan Earthquake and Tsunami caused serious damages in the coastal area of eastern Japan. Many houses and cars on the road were swept away by the tsunami. Also, industrial facilities such as chemical plants in the coastal area were completely destroyed. Damage from saline seawater was not limited only to the rice field areas, and there were also serious anxieties regarding the possibility of ground contamination as a result of harmful heavy metals that leaked from destroyed chemical plants. In light of this scenario, we carried out a quantitative survey to examine these areas. This paper reports on the results of our survey. It was found that high salt concentrations were detected on the ground surface but predictions state that these concentrations can be diluted with rainfall. It was also revealed that serious ground contamination due to the harmful heavy metals was not detected.

    DOI: 10.11345/nctam.62.141

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  • Coupled chemical-hydraulic-mechanical modelling of long-term alteration of bentonite Reviewed

    T. Ishii, R. Yahagi, H. Owada, I. Kobayashi, M. Takazawa, K. Yamaguchi, Y. Takayama, S. Tsurumi, A. Iizuka

    Clay Minerals - Journal of Fine Particle Science   48 ( 2 )   331 - 341   2013.5

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    In order to evaluate the long-term behaviour of the engineered barriers in geological disposal sites for transuranic element-bearing (TRU) waste, an evaluation by numerical analysis is required. Although chemical and hydraulic/mechanical analyses have been conducted independently until now, essentially both type of phenomena occur simultaneously and produce synergistic effects. Therefore, we focused attention on the buffer (bentonite) engineered barrier and conducted a study of which involved incorporating hydraulic/mechanical phenomena into the chemical analysis of bentonite alteration.
    The simulations employed weakly-coupled chemical and hydraulic/mechanical effects to study the behaviour in one dimension. The results showed that the dissolution of the montmorillonite is suppressed in the buffer section nearest the cement material. Moreover, in order to achieve a fully coupled analysis in future, the present study also identifies issues that need to be resolved.

    DOI: 10.1180/claymin.2013.048.2.13

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  • ベントナイトの特異性の解明と構成関係の導出

    前田 圭介, 飯塚 敦, 河井 克之, 高山 裕介

    神戸大学都市安全研究センター研究報告   ( 17 )   39 - 48   2013.3

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    DOI: 10.24546/81011407

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  • 土/水/空気連成解析手法による異なる含水比の締固め地盤の品質評価

    佐藤 武斗, ポムマチャン ヴィラデス, 河井 克之, 飯塚 敦

    神戸大学都市安全研究センター研究報告   ( 17 )   31 - 38   2013.3

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    DOI: 10.24546/81011406

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  • 災害派遣医療チームの配置モデルに関する考察

    小谷 稔, 飯塚 敦

    都市安全研究センター研究報告   ( 17号 )   23 - 30   2013.3

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  • 過圧密粘土の吸水軟化による正規圧密粘土化現象の検証

    安原 昇平, 吉富 力, 河井 克之, 飯塚 敦

    神戸大学都市安全研究センター研究報告   ( 17 )   49 - 60   2013.3

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    DOI: 10.24546/81011408

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  • Expression of mechanical characteristics in compacted soil with soil/water/air coupled F.E. Simulation Reviewed

    K. Kawai, A. Iizuka, S. Kanazawa

    1   1129 - 1132   2013

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    Results obtained in a lab compaction test are difficult to apply to the design and compaction control at an actual geotechnical engineering site. This is attributed to the fact that the mechanism for compaction has not been explained using the principles of soil mechanics. The main theme of this study is interpretation of the compaction mechanism with unsaturated soil mechanics. Here, static compaction tests were simulated with soil/water/air coupled finite element analysis code DACSAR-MP. Consequently, the shape of the compaction curve was successfully expressed. Moreover, the effects of compaction on compressibility and permeability of compacted soil could be reasonably explained. Additionally, shear deformation was applied to the specimen obtained from static compaction simulations in soil/water/air coupled analysis. The relationships between shear strength and compaction curve showed good agreement with the actual behavior.

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  • THE RELATIONSHIP BETWEEN LIFE CYCLE COSTS AND FAILURE PROBABILITY WHICH INHABIT THE HYDRAULIC BARRIER IN WASTE DISPOSAL SITE Reviewed

    Takeshi SATOH, Takeshi NAGAE, Atsushi IIZUKA

    Geosynthetics Engineering Journal   28 ( 0 )   109 - 116   2013

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    DOI: 10.5030/jcigsjournal.28.109

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  • Stress–Strain relationship for the singular point on the yield surface of the elasto-plastic constitutive model and quantification of metastability Reviewed

    Tomohide Takeyama, Thirapong Pipatpongsa, Atsushi Iizuka, Hideki Ohta

    Geotechnical, Geological and Earthquake Engineering   25   229 - 239   2013

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    © Springer Science+Business Media Dordrecht 2013. In this chapter, the stress–strain relationship on the singular point of the yield surface of the original Cam clay model and the Sekiguchi-Ohta’s model is derived in order to compute the volume change correctly. Metastable space, the range of increment of strain in which effective stress does not get away from the singular point of yield surface, was theoretically derived. In metastable space, the increment of volumetric strain is larger than the increment of deviatoric strain.

    DOI: 10.1007/978-94-007-5675-5_15

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  • Elasto-plastic constitutive model for unsaturated soils with subloading surface concept Reviewed

    Shintaro Ohno, Katsuyuki Kawai, Atsushi Iizuka, Shinya Tachibana, Shin ichi Kanazawa, Hideki Ohta

    Geotechnical, Geological and Earthquake Engineering   25   215 - 228   2013

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    © Springer Science+Business Media Dordrecht 2013. An elasto-plastic constitutive model for unsaturated soils is improved to realize numerical stability of computations at the singular point on the yield surface and an accurate prediction of the mechanical behavior of overconsolidated (or elastic state) soils in this chapter. The authors introduce the exponential contractancy model (EC model) by Ohno et al. (J Appl Mech JSCE 9:407–414, 2006) and the subloading surface model by Hashiguchi and Chen (Int J Numer Anal Method Geomech 22:197–227, 1998) to the elasto-plastic constitutive model for unsaturated soils by Ohno et al. (J JSCE 63(4):1132–1141, 2007). The applicability of the constitutive model is verified by simulating triaxial shear tests under constant net stress undrained conditions.

    DOI: 10.1007/978-94-007-5675-5_14

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  • 二次圧密による先行効果を考慮した弾・粘塑性構成モデルの拡張 Reviewed

    HIRATA Masafumi, IIZUKA Atsushi, OHTA Hideki

    Doboku Gakkai Ronbunshuu C   Vol.69 ( No.4 )   pp.404 - 416   2013

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    In order to express time dependence actions, such as secondary consolidation, creep, and strain rate dependence, much elasto-viscoplastic constitutive models are proposed until now. However, in these constitutive models based on a viscoplasticity theory, the time dependence action from an overconsolidation domain to a normal consolidation domain cannot be expressed continuously. Moreover, Pc-effect by secondary consolidation cannot be evaluated quantitatively, either.<br> In this paper, the elasto-viscoplastic model in consideration of Pc-effect by secondary consolidation is proposed. Moreover, the simulations of shear test and consolidation test were carried out and the validity and applicability of this constitutive model were examined.

    DOI: 10.2208/jscejge.69.404

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  • Evaluation of long-term interaction between cement and bentonite for geological disposal, (4) Effect of montmorillonite content on mechanical and hydraulics properties of bentonite and its numerical modeling Reviewed

    Takayama,Y, Tsurumi,S, Iizuka,A, Kobayashi,I, Ohwada,H, Ishii,T, Yahagi,R

    Proc. 5th Clays in Natural and Engineered Barriers for Radioactive Waste Confinement   2012.10

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  • Evaluation of long-term interaction between cement and bentonite for geological disposal, (4) Chemical alteration analysis of bentonite in consideration of hydraulic/mechanical properties Reviewed

    Ishii,T, Yahagi,R, Ohwada,H, Kobayashi,I, Takazawa,M, Yamaguchi,K, Takayama,Y, Tsurumi,S, Iizuka,A

    Proc. 5th Clays in Natural and Engineered Barriers for Radioactive Waste Confinement,   2012.10

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  • An Interpretation of Mechanical Properties of Bentonite as a Non-linear Elastic Material Reviewed

    International journal of GEOMATE : geotechnique, construction materials and environment   3 ( 1 )   357 - 362   2012.9

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  • 地下水位変動に伴う地盤の長期沈下

    籠橋 慶太, 飯塚 敦, 河井 克之

    神戸大学都市安全研究センター研究報告   ( 16 )   23 - 32   2012.3

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    DOI: 10.24546/81011370

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  • 不飽和土の力学によるジオテキスタイル補強効果の検討

    藤原 鉄也, 飯塚 敦, 河井 克之

    神戸大学都市安全研究センター研究報告   ( 16 )   45 - 54   2012.3

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    DOI: 10.24546/81011372

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  • Expression of self-hardening property of coal fly-ash Reviewed

    Phommachanh, V, Maegawa, F, Kawai, K, Iizuka, A

    Proc. 5th Asia-Pacific Conf. on Unsaturated soils   489 - 494   2012.3

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  • 神戸空港島の経年品質評価

    荒金 延明, 宮本 郁美, 飯塚 敦, 河井 克之

    神戸大学都市安全研究センター研究報告   ( 16 )   33 - 43   2012.3

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    DOI: 10.24546/81011371

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  • 自硬性を考慮した石炭灰のモデル化

    Phommachanh,V, 前川太, 河井克之, 飯塚敦

    神戸大学都市安全研究センター研究報告   ( 16 )   63 - 74   2012.3

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    DOI: 10.24546/81011374

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  • The role of unsaturated geomechanics in desertification due to salt damage Reviewed

    Iizuka,A, Kawai,K, Nomura,S, Tachibana,S, Ohno,S, Pipatopongsa,T

    Proc. 5th Asia-Pacific Conference on Unsaturated Soils (AP-UNSAT2011)   31 - 44   2012.3

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  • Mathematical model of soil/water/air coupled problem for unsaturated soils considering mass transfer within pore-water Reviewed

    Nomura, S, Kawai, K, Iizuka, A, Tachibana, S, Kanazawa, S

    Proc. 5th Asia-Pacific Conf. on Unsaturated Soils   287 - 292   2012.3

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  • Elasto-plastic constitutive model for expansive soils with a concept of fully saturation curve Reviewed

    S. Tachibana, Y. Takayama, A. Iizuka, K. Kawai, S. Ohno, I. Kobayashi

    5th Asia-Pacific Conference on Unsaturated Soils 2012   1   303 - 308   2012

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    This study presents a new constitutive model for expansive soils. Under any arbitrary state of degree-of-saturation, the mechanical void ratio predicted by the elasto-plastic constitutive models, i.e. EC model and Se-hardening model are combined with the additional void ratio in order to characterize the typical swelling behavior of expansive soil. Herein, the fully saturation curve which derived from compaction and consolidation experimental tests are taken into consideration. The proposed model is examined by simulating the typical experimental test on expansive soil, i.e. normally consolidation and swelling pressure tests. © 2012 IEEE.

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  • 地盤内塩分移動シミュレーションによる陸前高田一本松の生育環境評価 Reviewed

    68 ( 2 )   I_345 - I_352   2012

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    DOI: 10.2208/jscejam.68.i_345

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  • Consideration of influences of soil parameters on compaction behavior with soil/water/air coupled F. E. code Reviewed

    KAWAI Katsuyuki, SAKAMOTO Satoshi, PHOMMACHANH Viradeth, IIZUKA Atsushi

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   68 ( 2 )   I_299 - I_306   2012

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    Compacted soil is widely used for earth structures. However, the mechanism of compaction has not been explained, so it is difficult to grasp distributions of stress, void ration, and soil moisture within compacted earth structure. Therefore, estimation of safety and stability of compacted earth structures exposed to natural disaster is complicated. Compaction is decreasing void ratio by applying stress under certain water content and pushing air out of soil mass. Thus, the mechanics of unsaturated soil, which includes air within void, is needed for understanding of compaction. In this study, we regarded compaction as compression and expansion phenomenon of unsaturated soil under drained air and undrained water conditions and formulated it in initial-boundary-value problem. Here, the influences of permeability and soil water retention characteristics on compaction were considered and static compaction tests were simulated. Moreover, multi-layered compaction was examined.

    DOI: 10.2208/jscejam.68.I_299

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  • 土/水/空気連成有限要素法を用いた締固め土の力学挙動の解析 Reviewed

    68 ( 2 )   I_291 - I_298   2012

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    DOI: 10.2208/jscejam.68.i_291

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  • 自硬性を考慮した石炭灰のモデル化及び埋立て模型地盤の解析シミュレーション Reviewed

    68 ( 2 )   I_307 - I_315   2012

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    DOI: 10.2208/jscejam.68.i_307

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  • Protective measures of the monumental pine in Rikuzentakada with soil-water-air-solved material coupled model Reviewed

    Sugiyama, Y, Nomura,S, Kawai,K, Iizuka,A

    Proc. of 2nd Int. Conf. GEOMATE 2012   828 - 833   2012

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  • An interpretation of mechanical properties of bentonite as a non-linear elastic material Reviewed

    Takayama, Y, Tsurumi,S, Iizuka,A, Kawai,K

    Proc. of 2nd Int. Conf. GEOMATE 2012   666 - 671   2012

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  • Influences of soil material parameters in compaction simulation with soil/water/air coupled F. E. code Reviewed

    Sakamoto, S, Kawai,K, Phommachanh,V, Iizuka,A

    Proc. of 2nd Int. Conf. GEOMATE 2012   391 - 396   2012

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  • Simulations of Static Compaction with Soil/Water/Air Coupled F.E. Analysis Reviewed

    Katsuyuki Kawai, Masaki Shibata, Takeru Ohtsuki, Viradeth Phommachanh, Shinichi Kanazawa, Atsushi Iizuka

    Unsaturated Soils: Research and Applications   181 - 187   2012

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    DOI: 10.1007/978-3-642-31343-1_23

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  • Static pressure distribution beneath granular wedges sloped at angle of repose Reviewed

    Pipatpongsa,T. Heng, S. Iizuka,A, Ohta,H

    Proc. International Symposium on Deformation Characteristics of Geomaterials (IS-Seoul 2011)   Vol.2   924 - 932   2011.9

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    Static friction in granular wedges can stabilize own weight on a horizontal plane without lateral supports. This sort of problem provides fundamental knowledge about pressure distribution along the foundation of earth works which have a long triangular shape in particular. The present study reviews the authors' recent development on an analytic model of a sand heap which adopted Nadai's hypothesis on the major principal stress orientation and a framework of below-yielding limit. Because deformation analyses of many geotechnical engineering problems often require the magnitude of coefficient of lateral earth pressure at-rest K-0 to describe in situ lateral earth pressure, emphasis is placed on the evaluation of stress ratio under the apex of sand heap which represents Jaky's basic assumption on the derivation of K-0 in the prismatic sand heap sloped at an angle of repose. Comparison of the analytical stress ratio along the central plane of granular wedge with Jaky's expressions was reported.

    DOI: 10.3233/978-1-60750-822-9-924

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  • 飽和/不飽和地盤内における水溶性物質移動モデルの構築 Reviewed

    14   I_231 - I_240   2011.9

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    DOI: 10.2208/jscejam.67.i_231

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  • ベントナイト材料の力学挙動のモデル化

    飯塚 敦, 河井 克之, 高山 裕介, 前田 圭介

    神戸大学都市安全研究センター研究報告   ( 15 )   13 - 20   2011.3

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    DOI: 10.24546/81011336

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  • Theoretical Evaluation of the Mechanical Behavior of Unsaturated Soils Reviewed

    Michinori Honda, Shintaro Ohno, Atsushi Iizuka, Katsuyuki Kawai, Hideki Ohta

    Geotechnical and Geological Engineering   29 ( 2 )   171 - 180   2011.3

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    An evaluation method for the mechanical behavior of unsaturated soils is studied in this paper. Although the mechanical behavior of unsaturated soils is complicated, a simple modeling is preferable in practice. This is because the soil properties are not homogeneous and ground data is limited when structures are being designed. In addition, in order to evaluate the reliability of the design, the physical meanings of the parameters applied in the prediction model should be clear. Firstly, the authors study the relationship between compaction curves and compression indexes in the unsaturated state that is used in the proposed constitutive model. Based on the constitutive model, the stress paths for constant volume shear tests are formulated under a constant void ratio condition and the stress paths for undrained shear tests are calculated under a constant water content condition. In the case of unsaturated specimens, the volume of these specimens changes with the shear deformation and the stress paths depend on the initial degree of saturation. The results of the calculation qualitatively describe the test results by considering the changes in effective confining pressure in the undrained condition and the water retention curves. © 2010 Springer Science+Business Media B.V.

    DOI: 10.1007/s10706-010-9340-6

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  • スマート三軸試験装置を用いた三軸圧縮せん断試験

    河津 次郎, 安原 昇平, 河井 克之, 飯塚 敦

    神戸大学都市安全研究センター研究報告   ( 15 )   41 - 50   2011.3

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    DOI: 10.24546/81011339

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  • 土/水/空気連成有限要素解析プログラムを用いた締固め土の強度発現メカニズムの検討

    柴田 昌輝, 大槻 剛瑠, 河井 克之, 飯塚 敦

    神戸大学都市安全研究センター研究報告   ( 15 )   51 - 58   2011.3

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    DOI: 10.24546/81011340

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  • Formulation and application for soil/water/air/dissolved material model

    ( 15 )   21 - 28   2011.3

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    DOI: 10.24546/81011337

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  • 盛土材料の初期含水条件が初期応力状態に及ぼす影響

    田中 麻穂, 河井 克之, 金澤 伸一, 飯塚 敦

    神戸大学都市安全研究センター研究報告   ( 15 )   29 - 40   2011.3

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    DOI: 10.24546/81011338

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  • A numerical interpretation of density homogenization of bentonite material in wetting process Reviewed

    Atsushi Iizuka, Yusuke Takayama, Shinya Tachibana, Shintaro Ohno, Ichizo Kobayashi, Katsuyuki Kawai

    Proceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM   ( PARTS A AND B )   949 - 954   2011

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    Due to its low permeability and excellent expansion characteristics, bentonite is an excellent candidate with potential use as a buffer in the disposal of nuclear waste. Its expansion characteristics, activated by wetting, can be interpreted based on the full saturation line, depicted as a unique line on the density and the confining pressure relationship as proposed by Kobayashi et al. (2007). In addition, its elasto-plastic constitutive relation can also be formulated by introducing additional irreversible strain component describing the expansion of the montmorillonite present in the bentonite material. A constitutive model can consistently express the mechanical behavior of the compacted bentonite material from the unsaturated to the fully saturated state. This paper describes the density homogenization process that was conducted through a series of soil-water coupled elasto-plastic finite element simulations. Specifically, bentonite specimens, with different initial densities, were permeated with a constant water head. Stresses and strains developing in bentonite, particularly the density change, were carefully examined. A series of numerical simulations, performed on the two specimens, showed that specimens did not homogenize to a unique value of density upon reaching the fully saturated state. To confirm the simulation results, we carried out a series of experiments. The experimental results also support our simulation results. Copyright © 2011 by ASME.

    DOI: 10.1115/ICEM2011-59153

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  • Statics of loose triangular embankment under Nadai's sand hill analogy Reviewed

    Pipatpongsa,T, Heng,S, Iizuka,A, Ohta,H

    Journal of the Mechanics and Physics of Solids   58   1506 - 1523   2010.10

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    In structural mechanics, Nadai's sand hill analogy is the interpretation of an ultimate torque applied to a given structural member with a magnitude that is analogously twice the volume of stable sand heap which can be accommodated on a transverse cross-section basis. Nadai's analogy is accompanied by his observation of a loose triangular embankment, based on the fact that gravitating loose earth is stable if inclined just under the angle of repose. However, Nadai's analysis of stress distribution in a planar sand heap was found to be inaccurate because the total pressure obtained from Nadai's solution is greater than the self-weight calculated from the heap geometry. This raises a question about the validity of his observation in relation to the analogy. To confirm his criterion, this article presents and corrects the error found in Nadai's solution by analyzing a radially symmetric stress field for a wedge-shaped sand heap with the purpose of satisfying both force balance and Nadai's closure. The fundamental equation was obtained by letting the friction state vary as a function of angular position and deduce it under the constraint that the principal stress orientation obeys Nadai's closure. The theoretical solution sufficiently agreed with the past experimental measurements. © 2010 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jmps.2010.07.013

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  • Banking simulation with a constitutive model for unsaturated soil Reviewed

    M. Tanaka, K. Kawai, S. Kanazawa, A. Iizuka, S. Tachibana, S. Ohno, T. Takeyama

    Proc. 5th Int. Conf. on Unsaturated Soils   1337 - 1342   2010.9

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  • 締固め方法の違いが締固め土構造物の品質に及ぼす影響 Reviewed

    柴田 昌輝, 河井 克之, 尾崎 早希子, 金澤 伸一, 橘 伸也, 飯塚 敦

    応用力学論文集   Vol.13   363 - 370   2010.9

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  • 築堤シミュレーションにおける設定条件が盛土内応力分布に及ぼす影響 Reviewed

    田中 麻穂, 河井 克之, 金澤 伸一, 橘 伸也, 大野 進太郎, 飯塚 敦, 竹山 智英

    応用力学論文集   Vol.13   423 - 430   2010.9

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  • Study of stratification resistant to salt damage Reviewed

    Nomura, S, Kawai, K, Kanazawa, S, Iizuka, A

    Proc. 5th Int. Conf. on Unsaturated Soils   2   1133 - 1139   2010.9

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    Desertification due to salt damage has recently become a serious problem throughout the world. Salt damage is a phenomenon where salt in the groundwater gets concentrated at the ground surface and kills vegetation. In this study salt damage due to disequilibrium of water balance was simulated with unsaturated soil/water coupled simulation code, as applied the material transport equation. Evaporation and precipitation cycles were applied to a model of ground that contained salty groundwater in its deep region. This allowed the successful reproduction of the phenomenon of salt accumulation on the ground surface. Additionally, identical climatic conditions were applied to model grounds consisting of two types of soil, different in terms of their soil-water retention characteristics. It was found that two methods of overlay and insertion of a layer of coarse-grade material, known as 'mulching', are effective in the prevention of salt accumulation. © 2011 Taylor & Francis Group, London.

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  • Simulation of static compaction with unsaturated soil/water coupled F. E. analysis Reviewed

    M. Shibata, K. Kawai, S. Kanazawa, A. Iizuka

    Proc. 5th Int. Conf. on Unsaturated Soils   965 - 971   2010.9

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  • Mechanical behaviors and water retention characteristics of micro-porous ceramic particles produced by burning sludge Reviewed

    Kawazu, J, Kawai, K, Kanazawa, S, Iizuka, A

    Proc. 5th Int. Conf. on Unsaturated Soils   277 - 282   2010.9

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  • 神戸空港における地盤変形解析手法の構築 Reviewed

    山本 卓生, 坂上 敏彦, 高橋 嘉樹, 柳浦 良行, 南部 光広, 飯塚 敦

    土木学会論文集C   Vol.66 ( No.3 )   457 - 471   2010.7

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  • 超軟弱地盤における道路盛土の変形挙動要因とその抑制対策 Reviewed

    平田 昌史, 木藤 政則, 山田 耕一, 飯塚 敦, 荒井 克彦

    土木学会論文集C   Vol. 66 ( No. 2 )   356 - 369   2010.6

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  • 不飽和土/水連成解析による築堤シミュレーション

    河井 克之, 田中 麻穂, 金澤 伸一, 橘 伸也, 大野 進太郎, 飯塚 敦, 竹山 智英

    神戸大学都市安全研究センター研究報告   ( 13 )   1 - 8   2010

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  • Analyses of pressure distribution using arching criteria in 2D sand heaps Reviewed

    Pipatpongsa,T, Ohta,H, Iizuka,A

    Theoretical and Applied Mechanics Japan   58   41 - 48   2010

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    Pressure distribution in sand heaps is affected by a particular arching action during the formation process. The closure of fixed principal axes successfully links arching criterion to capture the phenomenon of central stress minimum in conical sand heaps. However, it is insufficient to explain a negligible stress dip observed in planar sand heaps, which are of practical interest to civil engineers because many earthworks are triangular in shape. This study explains the closure of polarized principal axes and the stress distribution formulation, which was found to be agreeable with experimental data. The direction of major compression along a circle traced about the apex might provide a suitable arching criterion in the 2D space of sand heaps.

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  • A finite element simulator for mechanical behavior of unsaturated earth structures exposed to evaporation and moisturization Reviewed

    Kanazawa.S, Kawai,K, Ohno,S, Tachibana,S, Pipatpongsa,T, Takeyama,T, Iizuka,A

    Proc. 4th Asia-Pacific Conference on Unsaturated Soils   711 - 718   2009.11

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    To predict the long-term elasto-plastic behavior of unsaturated earth structures, a constitutive model, which can express the following typical mechanical behavior of unsaturated soil, is needed. This includes shrinkage and increase of stiffness upon drying (i.e. suction increase), collapse with reduction of stiffness upon wetting (i.e. suction decrease), and the influences of suction history related to the hysteresis of soil-water retention characteristics. In this study, a new constitutive model is proposed for unsaturated soil where the effective degree of saturation is used as a parameter relating to stiffness. The model shows good agreement with experimental results. In addition, a soil/water coupled finite element simulation code (simulator), as applied to this model, is introduced. The appropriateness of the simulator is demonstrated for the case of a virtual fill.

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  • HPMを用いた土/水連成有限要素解析における水頭の空間離散化 Reviewed

    平田 昌史, 藤山 哲雄, 竹山 智英, 飯塚 敦, 太田 秀樹

    応用力学論文集   Vol.12   187 - 194   2009.9

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  • Simulations of static compaction with unsaturated soil/water coupled F. E. code Reviewed

    12   429 - 436   2009.9

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  • Stress-strain and water retention characteristics of micro-porous ceramic particles made with burning sludge Reviewed

    Kawai,K, Iizuka,A, Kanazawa,S, Fukuda,A, Tachibana,S, Ohno,S

    Proc. of the International Symposium on Prediction and Simulation Methods for Geohazard Mitigation (IS-Kyoto 2009)   339 - 345   2009.5

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    When troublesome sludge discharged from industries and purification plants are burnt by 1300 degree, they change to innocuous micro-porous ceramic materials. The authors are seeking for practical use of such micro-porous ceramic materials in the geotechnical engineering field, particularly for geohazard mitigation. Then, in order to grasp fundamental mechanical properties of the micro-porous ceramic particles, a series of laboratory tests, that is, triaxial compressive shear tests, permeability tests and water retention tests, were performed. It is found that the stress-strain characteristics and permeability of the micro-porous ceramic particles are very similar to those of standard sandy materials but they have very high water retention capability. Next, applicability of the unsaturated elasto-plastic constitutive model proposed by Ohno et al. (2007) to the mechanical behavior of micro-porous ceramic particles was examined in this paper.

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  • Rationale for coefficient of earth pressure at rest derived from prismatic sand heap Reviewed

    Pipatpongsa,T, Heng,S, Iizuka,A, Ohta,H

    Journal of Applied Mechanics   Vol.12   383 - 394   2009

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  • The critical state theory applied to porous rock considering the distructuration effects

    Tachibana, S, Iizuka, A, Kuwano, J

    Proceeding of 6th Regional Symposium on Infrastructure Development   1   25   2009

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  • Stress propagation in semi-infinite planar heap of granular medium possessing self-weight in loose condition Reviewed

    Pipatpongsa, T, Heng, S, Kanazawa, S, Iizuka, A

    Proc. the Asian Pacific Conference for Materials and Mechanics 2009   2009

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  • On the vertex singularity of the Sekiguchi-Ohta model Reviewed

    Thirapong Pipatpongsa, Tomohide Takeyama, Hideki Ohta, Atsushi Iizuka

    Theoretical and Applied Mechanics Japan   57   89 - 94   2009

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    Discontinuity at the vertex of the Sekiguchi-Ohta model causes numerical troubles when associated flow rule is applied because the singularity encountered in the derivatives of yield function. Based on Koiter's associated (low rule, the numerical implementation to accommodate the vertex singularity had been generalized. The set of applied strains had been formulated and defined as the domain of metastability. This study is focused on validity of the domain of metastability by a regularized method. Infinitesimal vicinity adjacent to the vertex is considered to regularize all of plastic flow in outwards normal direction to the yield surface. It was confirmed that the metastable domain of the Sekiguchi-Ohta model is bounded by an elliptical cone in principal strain space.

    DOI: 10.11345/nctam.57.89

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  • Effect of yield function's form on performance of the backward-Euler stress update algorithm for the original cam-clay model Reviewed

    Khosravi, M. H, Pipatpongsa, T, Kanazawa, S, Iizuka, A

    Proc.11th JSCE International Summer Symposium   161 - 164   2009

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  • Study of the stratigraphic architecture resistant for salt damage and the method to purify salty ground Reviewed

    12   421 - 428   2009

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  • Impacts of plant-induced uptake on the stability of the earth structure Reviewed

    K. Kawai, A. Iizuka, S. Tachibana, S. Ohno

    Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering: The Academia and Practice of Geotechnical Engineering   1   526 - 529   2009

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    It is empirical knowledge that vegetation can influence the behavior of earth structure. It prevents surface failure and erosion due to rain and wind, and contributes to the stability of earth structure. Moreover, it encourages water circulation with transpiration, fixes atmospheric nitrogen and carbon via photosynthesis, and improves the environment. Therefore, surface seeding is purposely performed when an earth structure, such as an embankment or an earth dam, is constructed. Typically, vegetation grows on unsaturated soil. Consequently, a constitutive model for unsaturated soil is needed for understanding the effects of vegetation on the ground. In this study, we focus on the effect of vegetation-induced water uptake. The effect of water uptake due to evapo-transpiration can be regarded as reduction of water content within soil and appropriately represented in simulation studies. The constitutive model proposed by Ohno et al. (2007) is used for the simulation. In this model, the effective degree of saturation is treated as a parameter expressing hardening/softening. Moreover, the 'root element,' where the reduction of water content occurs, is applied to the soil/water coupled analysis with unsaturated soil mechanics. To verify the applicability of this model, the accident in Poland where non-uniform settlement and building damage were caused by water uptake of vegetation was simulated. The results show that water uptake increased suction and induced non-uniform settlement. This method is effective for understanding the effects of vegetation on the ground. © 2009 IOS Press.

    DOI: 10.3233/978-1-60750-031-5-526

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  • EXAMPLES OF EDUCATION SYSTEM RECONSTRUCTION MADE BY ENGINEERING DEPARTMENTS Reviewed

    Muneo HORI, Sadao KIMURA, Atsushi IIZUKA, Satoru OHTSUKA, Kenichi KUMAGAI, Toshiaki SAITOH, Takeshi TAMURA, Chikanori HASHIMOTO, Junnichi HIRADE, Eiki YAMAGUCHI

    Journal of Japan Society of Civil Engineers, Ser. H (Engineering Education and Practice)   1   135 - 143   2009

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    DOI: 10.2208/jscejeep.1.135

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  • Theoretical undrained shear behavior of unsaturated soils Reviewed

    Honda Michinori, Ohno Shintaro, Iizuka Atsushi, Kawai Katsuyuki, Ohta Hideki

    Proc. of 12th Int. Conf. of IACMAG   pp.992-997   2008.10

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  • Study of spatial discretization scheme in unsaturated soil/water coupled analysis Reviewed

    Journal of Applied Mechanics, JSCE   11   331 - 338   2008.9

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  • Influence of vegetation uptake on the deformation of ground Reviewed

    Journal of Applied Mechanics, JSCE   11   443 - 450   2008.9

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  • Numerical modelling for life cycle planning of highway embankments on soft foundations Reviewed

    S Omoto, H Ohta, A Iizuka, T Takeyama, T Ishigaki

    Advances in Transportation Geotechnics   389 - 395   2008.8

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    DOI: 10.1201/9780203885949.ch52

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  • Introduction about the Plan of Course System in Lectures of Japanese Geotechnical Society Reviewed

    Furuya,H, Iizuka,A

    Proc. the first International Conference on Education and Training in Geo-engineering Sciences   489 - 492   2008.6

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  • ジョグジャカルタ近郊集落における地盤条件の調査報告

    橘伸也, ジョコ・ソエラノ, 飯塚敦

    都市安全研究センター報告   ( 12 )   33 - 42   2008.6

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  • タイ東北部における塩害と地盤変状シミュレータを用いた国際協力の可能性

    ピパットポンサー・テュラポン, 飯塚敦, 河井克之

    神戸大学都市安全研究センター研究報告   ( 11 )   43 - 50   2008.3

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  • Analysis of embankment by nonlinear contractancy description Reviewed

    Ohno,S, Takeyama,T, Pipatpongsa,T, Ohta,H, Iizuka,A

    Proc 13th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering   1097 - 1100   2007.12

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  • Modelling of compression/swelling behavior of compacted bentonite using constant water-content line and constant degree-of-saturation line Reviewed

    Kobayashi,I, Toida,M, Sasakura,T, Iizuka,A, Ohta,H

    Proc. International Workshop on Long-term Performance of Smectitic Clays Embedding Canisters with Highly Radioactive Waste   2007.11

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  • 膨張性土質材料の過圧密時の摩擦を考慮した弾朔性構成則の改良

    平井 卓, 重野喜政, 高治一彦, 飯塚 敦

    建設工学研究所論文報告集   ( 49 )   67 - 76   2007.11

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  • An application of performance-based design concept to design of compacted ground Reviewed

    Honda,M, Iizuka,A, Kawai,K

    Proc. 1st International Symposium on Geotechnical Safety & Risk   2007.10

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  • The influences of uptake of vegetation on the ground Reviewed

    Journal of Applied Mechanics, JSCE   10   375 - 382   2007.9

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  • Inhomogeneous Deformation Developing in a Clay Specimen Reviewed

    Tachibana,S, Iizuka,A, Kawai,K, Kobayashi,I, Pipatpongsa,T, Ohta,H

    Proc 16th Southeast Asian Geotechnical Conference   289 - 296   2007.5

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  • Coefficient of Earth Pressure at rest derived from the Sekiguchi-Ohta modell Reviewed

    Pipatpongsa,T, Takeyama,T, Ohta,H, Iizuka,A

    Proc. 16th Southeast Asian Geotechnical Conference   289 - 296   2007.5

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  • A study on yield stress in unsaturated clay Reviewed

    Honda,M, Ohno,S, Iizuka,A, Kawai,K, Ohta,H

    Proc. 3rd Asian Conference on Unsaturated Soils   219 - 233   2007.4

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  • The salt disaster problem and its mathematical modeling Reviewed

    Iizuka,A, Kawai,K, Tachibana,S, Honda,M, Fujikawa,K, Pipatpongsa,T, Wang,W

    Proc. 3rd Asian Conference on Unsaturated Soils   347 - 352   2007.4

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  • The influences of evapo-transpiration on the ground Reviewed

    Kawai,K, Iizuka,A, Tachibana,S

    Proc. of the 3rd Asian Conference on Unsaturated Soils   359 - 364   2007.4

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  • Non-uniform settlement problem of compacted soil caused by the deformation characteristics of unsaturated soil on wetting Reviewed

    Kawai,K, Iizuka,A, Hayakawa,E, Wang,W

    Soils and Foundations   47 ( 2 )   195 - 206   2007.4

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    The soil/water-coupled analysis for unsaturated soil mechanics with the finite element method is used to express the behavior of compacted earth structures exposed to rainfall. The constitutive model, which is proposed by Karube et al. (1996, 1997) and modified by Karube and Kawai (2001), is formulated for initial and boundary problems and coded as DACSAR-U (lizuka et al., 2000). A deep fill, which consists of compacted, unsaturated soil, was analyzed with DACSAR-U. Different patterns of rainfall were applied to deep fills in finite element simulations. As a result, non-uniform settlement of deep fill can be calculated and the magnitude of settlement of deep fills is dependent on the amount of collapse, namely, the compression due to the decrease in suction. Moreover, delayed settlement due to rainfall and an accumulation of an irreversible settlement due to cyclic rainfall was observed.

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  • 神戸空港護岸築造工事における沖積粘性土層の挙動とその考察 Reviewed

    長谷川 憲孝, 柳浦 良行, 高橋 嘉樹, 和田 昌大, 飯塚 敦

    地盤工学ジャーナル 2007年3月号   2 ( 1 )   25 - 35   2007.3

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  • Study on constitutive model of elastoplastic behavior for swelling buffer material Reviewed

    Takashi Hirai, Yoshimasa Shigeno, Kazuhiko Takaji, Atsushi Iizuka

    Structural Engineering/Earthquake Engineering   24 ( 2 )   102 - 111   2007

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    A new constitutive model of swelling soil material is proposed to evaluate its mechanical characteristics. In the case of the compacted bentonite material, nonlinear behavior appears more dominantly than ordinary clay materials in the consolidation test. The original Cam-clay model cannot describe these characteristics observed in the compacted bentonite materials. Therefore, a new modeling that strain increment consists of linear summation of the swelling component and the elast-plastic component is introduced to describe the nonlinear behavior in the unloading stage. From the result of the simulation of the triaxial compression test, it is demonstrated that the stress pass and the stress and strain relationship are well simulated by the new model.

    DOI: 10.2208/jsceseee.24.102s

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  • Numerical investigation on the failure of normally consolidated clays Reviewed

    Tachibana,S, Iizuka,A, Kawai,K, Kobayashi,I, Pipatpongsa,T, Ohta,H

    International Journal for Numerical and Analytical Methods in Geomechanics   31   809 - 833   2007

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  • 土/水連成解析を用いた道路アセットマネジメント支援の試み Reviewed

    Atsushi Iizuka, Tsutomu Ishigaki, Yoshinori Omoto, Thirapong Pipatpongsa, Tomohide Takeyama, Hideki Ohta

    Journal of Applied Mechanics, JSCE   10   971 - 982   2007

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    DOI: 10.2208/journalam.10.971

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  • Comparison of original and modified cam clay models extended for Ko-consolidated clays Reviewed

    Ohta,H. Pipatpongsa,T, Takeyama,T, Ohno,S, Iizuka,A

    Proceedings of the Sri Lankan Geotechnical Society’s First International Conference on Soil & Rock Engineering   2007

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  • Soil/water coupled F.E. Simulation of field performance of 5 embankments placed on homogeneous clay Reviewed

    Takeyama, T, Pipatpongsa, T, Iizuka, A, Mizuta, T, Ohno, S, Ohta, H

    First Sri Lankan Geotechnical Society International Conference on Soil and Rock Engineering   2007

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  • New trend toward performance-based design in the construction industry Reviewed

    Horikoshi,K, Honjo,Y, Iizuka,A

    TAIPEI2006 International Symposium on New Generation Design Codes for Geotechnical Engineering Practice   2006.11

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  • Elasto-plastic constitutive modeling for dilative geomaterials in swelling Reviewed

    Hirai,T, Shigeno,Y, Iizuka,A

    Proc. of 3rd International Workshop on New Frontiers in Computational Geotechnics   91 - 96   2006.10

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  • Soil cantilever reinforced by geosynthetics and pre-stressed steel bars Reviewed

    Iizuka, A, Hirata, M, Ohta, H, Yokota, Y

    Proc. of 8th International Conference on Geosynthetics (CD-ROM)   1213 - 1218   2006.9

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    In this paper, the authors focus on the confining effect brought by geosynthetic-reinforcement. The reinforcement effect is not brought by the geosynthtics itself but mobilized complexly as a composite material consisting of geosynthetics and compacted soils. If the geosynthetics and the compacted soils are unified more tightly, higher reinforcement effect may be expected. Then, in this paper, presented is an experiment, that is, making soil cantilevers with compacted soils wrapped by geosynthetics which are tightly unified by prestressed steel bars. Two types of soil cantilevers were constructed. The soil structures were, first, constructed and wrapped by geosynthetics on the bases of styrene forms and, next, prestressed through the steel bars penetrated from the top surface to the bottom of the geosynthetic-reinforced soil structures. The soil cantilever was formed by melting and removing the styrene forms in order from the edge with monitoring the vertical displacements. It was found that amazing reinforcement effect appears by tightly confining the dilative deformation of compacted soils with the geosynthetics and the prestressed steel bars. The reinforcement effect is numerically investigated. A series of elasto-plastic FE numerical simulation was carried out. The compacted soil was modelled to be elasto-plastic body and the geosynthetics was expressed by the elastic material.

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  • 膨張性土質材料の弾朔性構成則に関する研究 Reviewed

    平野 卓, 重野 善政, 高治 一彦, 飯塚 敦

    応用力学論文集   9   471 - 478   2006.9

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  • 非線形コントラクタンシー表現を用いた土の弾朔性構成モデル Reviewed

    大野 進太郎, 飯塚 敦, 太田 秀樹

    応用力学論文集   9   407 - 414   2006.9

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  • On the Strategic viewpoints for Mitigation and Reconstruction for the Mid-Java Earthquake Disaster from the Lessons of Disasters in Japan

    Tsutomu Shigemura, Yoshimitsu Shiozaki, Hisashi Nanba, Akihiko Hokugo, Tamotsu Asai, Hiroshi Adachi, Atsushi Iiduka, Yasuko Kuwata

    International Symposium on Earthquake Engineering & Infrastructure & Building Retrofitting (EE & IBR)   2006.8

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  • 掘削工事における周辺地盤の変形予測手法の検討 Reviewed

    KOJIMA Kenichi, OHTA Hideki, TATEYAMA Masaru, IIZUKA Atsushi

    土木学会論文集   No.652/III-51,pp.217-228   2006.6

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  • 物質移動を考慮した不飽和土/水連成問題の数理モデルと有限要素解析手法 Reviewed

    藤川和彦, 飯塚敦, 河井克之, ピパットポンサー・ティラポン

    応用力学論文集   9   377 - 384   2006

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  • An evaluation method for the volume change characteristics of compacted soil Reviewed

    M. Honda, A. Iizuka, S. Ohno, K. Kawai, W. Wang

    Geotechnical Special Publication   ( 147 )   837 - 848   2006

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    This paper discusses the volume change characteristics of compacted soil based on oedometer test results. After making specimens with different water contents and under different compaction loads, compression tests are conducted under both saturated and unsaturated conditions. The effects of the compaction conditions on the compression curves are discussed. It is confirmed that the yield stress and the water content are important factors when evaluating a compression curve, while dry density and suction are important factors when evaluating the yield stress. Copyright ASCE 2006.

    DOI: 10.1061/40802(189)66

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  • 締固め土の圧縮特性に関する評価手法の検討 Reviewed

    本田道識, 飯塚敦, 大野進太郎, 河井克之, 汪偉川

    土木学会論文集   No.806/III-73   33 - 44   2005.12

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  • Elasto-plastic constitutive model to describe soil contractancy in a wide variety under axi-symmetric stress condition Reviewed

    Ohno,S, Iizuka, A, Ohta, H

    Proc. of the Fifth Workshop on Safety and Stability of Infrastructures against Environmental Impacts   192 - 203   2005.12

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  • 軟弱盛土基礎地盤の挙動予測における地盤調査結果の差異の影響

    Iizuka Atsushi, Nishida Hirofumi, Kawai Katsuyuki

    Memoirs of Construction Engineering Research Institute   47 ( 47 )   87 - 100   2005.11

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  • 地盤動態解析の基礎理論

    大野進太郎, 竹山智英, 飯塚敦, Pipatpongsa Thirapong, 太田秀樹

    東京工業大学 都市地震工学センター,第96回工学地震学・地震工学談話会,地震工学研究レポート   ( No.96 )   35 - 46   2005.10

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  • 膨潤性を有する緩衝材の弾朔性構成モデル化 Reviewed

    平井 卓, 重野 善政, 飯塚 敦

    応用力学論文集   Vol.8   395 - 402   2005.9

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  • 膨張性を有する緩衝材の弾塑性構成則に関する研究 Reviewed

    HIRAI Takashi, SHIGENO Yoshimasa, IIZUKA Atsushi

    Journal of Applied Mechanics, JSCE   Vol.8   2005.9

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  • Influence of ground improvement on the quality of man-made islands Reviewed

    Iizuka,A, Nishida,H, Kawai,K

    Proc. 11th International Association for Computer Methods and Advances in Geomechanics   327 - 332   2005.6

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  • Mechanical behavior of partly saturated ground considering the effect of evaporation and transpiration Reviewed

    Iizuka,A, Kawai,K, Wang,W

    The International Symposium on Numerical Simulation of Environmental Problems, Journal of the Faculty of Environmental Science and Technology   203 - 209   2005.5

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  • CHANGES IN THE INSTANTANEOUS SHEAR MODULUS OF NORMALLY CONSOLIDATED CLAY WITH SHEAR HISTORY Reviewed

    IIZUKA ATSUSHI, TACHIBANA SHINYA, KAWAI KATSUYUKI, OHTA HIDEKI

    Journal of the Japanese Geotechnical Society   45 ( 2 )   135 - 143   2005.4

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    Changes in the instantaneous shear modulus associated with the non-coaxiality of NC clay materials are presented. A series of hollow cylindrical shear tests was performed to measure the changes in the instantaneous shear modulus with shear history. After each normally consolidated clay specimen was compressively sheared until a prescribed shear level, it was continuously torsionally sheared under a constant volume to measure the instantaneous shear modulus. Coaxial constitutive relations, such as these of the conventional Cam-clay type of models, predict that the instantaneous shear modulus obtained, does not change regardless of the compressive shear history. On the contrary, it is known that non-coaxial constitutive relations theoretically bring about changes in the instantaneous shear modulus in relation to the compressive shear history. The test results supported the predictions made by the non-coaxial constitutive models. Finally, the proper formulation for the non-coaxiality between the stress and the incremental plastic strain is discussed.

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    Other Link: http://dl.ndl.go.jp/info:ndljp/pid/10424246

  • Changes in the instantaneous shear modulus of normally consolidated clay with shear history Reviewed

    Iizuka,A, Tachibana,S, Kawai,K, Ohta,H

    Soils and Foundations   45 ( 2 )   135 - 143   2005.4

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    Changes in the instantaneous shear modulus associated with the non-coaxiality of NC clay materials are presented. A series of hollow cylindrical shear tests was performed to measure the changes in the instantaneous shear modulus with shear history. After each normally consolidated clay specimen was compressively sheared until a prescribed shear level, it was continuously torsionally sheared under a constant volume to measure the instantaneous shear modulus. Coaxial constitutive relations, such as these of the conventional Cam-clay type of models, predict that the instantaneous shear modulus obtained, does not change regardless of the compressive shear history. On the contrary, it is known that non-coaxial constitutive relations theoretically bring about changes in the instantaneous shear modulus in relation to the compressive shear history. The test results supported the predictions made by the non-coaxial constitutive models. Finally, the proper formulation for the non-coaxiality between the stress and the incremental plastic strain is discussed.

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  • 河川水位上昇に伴う不飽和堤防盛土内の応力状態の変化予測

    飯塚 敦, 道奥 康治, 藤川 和彦

    神戸大学都市安全研究センター研究報告   ( 9 )   97 - 109   2005.3

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  • The effect of evapo-transpiration through vegetation on unsaturated ground deformation Reviewed

    Iizuka,A, Kawai,K, Wang,W

    Proc. of Symposium on Elasto-plasticity   37 - 46   2005.2

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  • Elasto-plastic constitutive equation to describe re-liquefaction phenomenon Reviewed

    OHNO Shintaro, IIZUKA Atsushi, KAWAI Katsuyuki, OHTA Hideki

    Plasticity, Damage and Metal Forming : Material Response and Multiscale Modeling, Proc. Of PLASTICITY'05: the 11th International Symposium on Plasticity and its Current Applications, edited by A.S.Khan and A.R.Khoei.   286 - 288   2005.1

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  • The non-coaxiality induced by stress rate on the instantaneous shear modulus of clays Reviewed

    Iizuka,A, Tachibana,S, Kawai,K, Ohta,H

    in the book of Dislocations, Plasticity, Damage and Metal Forming : Material Response and Multiscale Modeling, Key-note-lecture, Proc. Of PLASTICITY'05 : the 11th International Symposium on Plasticity and its Current Applications, edited by A.S.Khan and A   265 - 267   2005.1

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  • A simple evaluation method of adjacent ground settlement due to excavation work Reviewed

    Kojima, K, Ohta, H, Iizuka, A, Tateyama, M

    5th International Conference on Getechnical Aspects of Underground Construction in Soft Ground   719 - 723   2005

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    The prediction of back-fill settlement due to the excavation work is getting important, particularly in the urban area. The finite element simulation would be a suitable choice to answer it. However, it is less feasible in practice to carry it out because input parameters needed in the F.E. simulation are not sufficiently provided in advance at the stage of design work. In the past, some simple evaluation methods for predicting the back-fill settlement due to excavation works were presented by Peck, Long and Moormann et al. and so on. In this paper, a new method capable for predicting the back-fill settlement at the stage of design work is proposed, taking account of design parameters, i.e. soil parameters, retaining wall parameters and construction sequences. The proposed method is built up based on a lot of monitored records obtained from sites and the numerical results obtained from a series of F.E. simulations for imaginary excavation works. It is designed to be simple and useful at the stage of design work. This method consists of two parts, predictions of the maximum amount of back-fill settlement and the distance from the retaining wall. Finally, some case studies in which the proposed new method was applied to actual excavation sites in Japan are presented.

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  • Modeling of the confining effect due to the geosynthetic wrapping of compacted soil specimens Reviewed

    Iizuka,A, Kawai,K, Kim,E.R, Hirata,M

    Journal of Geotextiles and Geomembranes   22 ( 5 )   329 - 358   2004.10

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    This paper presents the modeling of the composite soil-geosynthetic structure and discusses the effect of the reinforcement arising from the confining of the deformation of the soil by geosynthetics. A series of compressive shear tests for compacted sandy soil specimens, wrapped in geosynthetics, is carried out for the purpose of quantitatively examining the effect of the geosynthetic reinforcement arising from the confining of the deformation of compacted soils during shearing. Furthermore, an elasto-plastic modeling for compacted soil and a rational determination procedure for input parameters, needed in the elasto-plastic modeling, are presented. In this paper, the subloading yielding Surface is introduced to the elasto-plastic modeling in order to describe the irreversible deformation characteristics of compacted soil during shearing. Since compacted soil is essentially unsaturated and its mechanical behavior is influenced by the suction working in the compacted soil media, the suction effect is taken into account in estimating of the degree of compaction. Finally, an elasto-plastic finite element simulation is conducted and the geosynthetic-reinforcement effect is presented. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.geotexmeml.2004.01.001

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  • Interpretation of existing constitutive models for unsaturated soil and the general expression of the constitutive model considering hysteresis of the water retention characteristic curve Reviewed

    KAWAI Katsuyuki, WANG Weichuan, IIZUKA Atsushi

    Journal of applied mechanics   Vol.7 ( No.1 )   505 - 513   2004.9

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    There are some constitutive models for unsaturated soil. However, their mathematical structures, particularly for expression of collapse phenomenon, are essentially the same. Therefore, it is possible to unify the constitutive models which were proposed in the past. In this paper, a generalized constitutive model for unsaturated soils is presented. First, we outline existing constitutive models for unsaturated soil and, next, we propose a comprehensive constitutive model for unsaturated soils in terms of the effective stress for unsaturated soils. To this new elasto-plastic model, it is easier to introduce sophisticated methods such as a rotational hardening, a subloading surface and so forth. This model is formulated in the form of incremental general stress and strain relationship and is incorporated into a finite element code, DACSAR-U, for unsaturated soils. The performance of the new constitutive model is demonstrated by comparing with the models proposed by Karube et at and by Honda et al

    DOI: 10.2208/journalam.7.505

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  • 土構造物の維持補修への構成式の応用 Reviewed

    石井 武司, 村上 章, 飯塚 敦

    地盤工学会 土と基礎   52 ( No.8(Ser.No.559) )   25 - 27   2004.8

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  • Modeling of the confining effect due to the geosynthetics wrapping of compacted soil specimen considering suction effect Reviewed

    Kim, E.R, Kim, Y.S, Iizuka,A, Kawai,K

    Proceedings of the 3rd Asian regional Conference on Geosynthetics   707 - 714   2004.6

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  • The role of numerical simulation for geosymthetic reinforced soil structures - from laboratory tests to full scale structures - Invited Reviewed

    Iizuka, A, Hirata, M, Ohta,H, Kawai, K, Yokota, Y

    GeoAsia2004, invited Lecture at ISSMGT TC9 Sponsored Session, Proceedings of the 3rd Asian regional Conference on Geosynthetics, Seoul Korea   153 - 172   2004.6

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  • Development of the elasto-plastic constitutive model for soils by using new descriptive function of dilatancy

    Ohno Shintaro, Iizuka Atsushi, Ohta Hideki

    Proceedings of the Japan National Conference on Geotechnical Engineering   39   261 - 262   2004

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    DOI: 10.11512/jiban.JGS39.0.261.0

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  • Applicability of the loading judgment based on viscoplasticity theory to Sekiguchi and Ohta's constitutive model

    Nishida Hirofumi, Iizuka Atsushi, Ohta Hideki

    Proceedings of the Japan National Conference on Geotechnical Engineering   39   913 - 914   2004

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    DOI: 10.11512/jiban.JGS39.0.913.0

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  • Safety and Symbiosis' form Viewpoint of geomechanics Reviewed

    Iizuka,A, Kawai,K, Wang,W

    Proc. KU-UW International Symposium #1 on Design Strategy towards Safety and Symbiosis of Urban Space   81 - 88   2004

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  • Implicit integration algorithm for a Cam-clay model at finite strain

    Tachibana Shinya, Iizuka Atushi, Ohta Hideki

    Proceedings of the Japan National Conference on Geotechnical Engineering   39   259 - 260   2004

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    DOI: 10.11512/jiban.JGS39.0.259.0

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  • Constitutive parameters of compacted sandy soils Reviewed

    Iizuka, A. Hirata, M, Ohta, H

    Proc. 13th Regional Conference for Africa, The Involvement of Geotechnical Engineering in Infrastructure development in Africa   713 - 719   2003.12

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  • Deformation analysis of soft subsoil on sloping bedrock loaded by highway embankment with stabilization methods Reviewed

    Iizuka,A, Yamamoto,N, Sueoka,M, Satou,N, Kawaida,M, Ohta,H

    Soils and Foundations   43 ( 5 )   81 - 92   2003.10

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    A highway embankment built in Akita prefecture using ground stabilization methods was constructed on very soft peat and clay deposits on a sloping base. This paper presents a case study of a soil/water coupled elasto-viscoplastic finite element simulation of an actual embankment construction, that is, the deformation analysis of a soft clayey foundation deposited on an inclined base with embankment loading. For execution of the numerical simulation, determining the input parameters needed in the analysis and evaluating the shape of sloping bedrock under the ground were problems. The former is discussed for a practical procedure of determining input parameters using unconfined compression strengths and the latter is accomplished by drawing a contour map of the top face of the bedrock under the ground, with reference to the geographical features of the area around the site and to a topographic map. The performance of the numerical simulation is discussed in comparison with in-situ monitored records. The effectiveness of ground stabilization methods employed at the site is also a topic of discussion.

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  • The change of instantaneous shear modulus associated with non-coaxiality of normally consolidated clays Reviewed

    Iizuka,A, Tachibana,S, Kawai,K, Ohta,H

    Proc. of the International Workshop on Prediction and Simulation Methods in Geomechanics (IWS-Athens 2003)   21 - 24   2003.10

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  • 15 years continuous settlement of a highway embankment on very soft clay Reviewed

    Hideki Ohta, Atsushi Iizuka, Masahiro Inagaki, Mitsuo Nozu, Tomohide Takeyama

    Proc. International Workshop on Geotechnics of Soft Soils   pp.49-62   2003.9

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  • 施工履歴の違いを考慮したCAES地下空洞掘削シミュレーション Reviewed

    西田博文, 飯塚敦, 河井克之, 伊藤文雄

    応用力学論文集   6   1131 - 1139   2003.9

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  • Soil/water coupled response to repeated loading Reviewed

    Ohno,S, Iizuka,A, Ohta,H

    Proc. of JSPS Core University Program on Environmental Engineering Symposium   381 - 390   2003.8

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  • Numerical assessment of long term non-uniform settlement of man-made island Reviewed

    Iizuka,A, Kawai,K, Nishida,H

    Proc. of 13th European Conference on Soil Mechanics and Geotechnical Engineering   1   709 - 712   2003.8

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  • Influence of water level change on the behavior of unsaturated zone Reviewed

    Kawai,K, Iizuka,A, Umehara,H. Wang, Kato,S

    Proc. of 13th European Conference on Soil Mechanics and Geotechnical Engineering   1   735 - 738   2003.8

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  • Undrained strength measured in lab/in-situ tests and strength mobilized at failure in the field Reviewed

    Ohta, H, Nishihara, A, Iizuka, A

    Proc. JSPS Core University Program on Environmental Engineering Symposium   391 - 408   2003.8

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  • Numerical interpretation of a shape of yield surface obtained from stress probe tests Reviewed

    Kobayashi,I, Soga,K, Iizuka,A, Ohta,H

    Soils and Foundations   43 ( 3 )   95 - 104   2003.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPANESE GEOTECHNICAL SOC  

    Experimental evidence suggests that a mutual relationship between anisotropy and structure of clays exists. It was hypothesized that development and decay of the structure of clays (called structuralizing and destructuralizing) can be regarded as development of anisotropy and decay of anisotropy (isotropization), respectively. Using this hypothesis, an anisotropic rotational hardening rule was incorporated in the Sekiguchi-Ohta elasto-plastic constitutive model. The subloading surface concept was also introduced to model the plastic deformation inside the yield surface more accurately.
    The proposed model provided some rational as well as physical explanations for the experimental facts. Using the proposed model, it was possible to simulate the apparent softening behavior observed in anisotropically consolidated specimens. For isotropically consolidated specimens, no softening was observed, which is consistent with the experimental data. At the critical state, the undrained shear strength of the anisotropically consolidated specimens was the same as that of the isotropically consolidated specimens. This is due to both specimens having the same soil structure after large shearing. The shape of yield surface obtained from stress probe tests was investigated by simulating the tests with the proposed model. Typical data of the stress probe tests of natural clays shows that the yield surface generally has a smooth elliptical shape. By modeling the rotation of yield surface, the proposed model was capable of simulating this 'apparent' yield surface.

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  • A study of the relation between volume change characteristics of compacted soil and the condition of compaction Reviewed

    Honda,M, Seguchi,H, Kim,E, Kawai,K, Iizuka,A, Karube,D

    Proc. of 2nd Asian Conference on Unsaturated Soils   177 - 180   2003.4

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  • The deformation and the moisture characteristics of unsaturated soils under isotropic loading and undrained condition Reviewed

    Kawai,K, Wang,W, Sakurai,K, Iizuka,A

    Proc. of 2nd Asian Conference on Unsaturated Soils   171 - 176   2003.4

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  • Suction change of compacted soils during static compaction test Reviewed

    Kawai,K, Nagareta,H, Hagiwara,M, Iizuka,A

    Proc. of 2nd Asian Conference on Unsaturated Soils   429 - 434   2003.4

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  • Estimation of the consolidated yielding stress of compacted soil considering the effects of suction Reviewed

    Kim,E., Kawai,K., Iizuka,A.

    Proc. of 2nd Asian Conference on Unsaturated Soils   271 - 276   2003.4

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  • Computational soil/water coupled unsaturated soil behavior Reviewed

    Iizuka,A, Kawai,K, Nishida,H, Honda,M, Karube,D

    Proc. of 2nd Asian Conference on Unsaturated Soils   299 - 304   2003.4

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  • Settlement of an embankment placed on the old seabed in a polder Reviewed

    H Ohta, A Iizuka

    Soft Ground Engineering in Coastal Areas   397 - 407   2003.1

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    DOI: 10.1201/9781439833919.ch45

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  • Failure criterion of soil specimens obtained from Mise-type clay materials

    Tachibana Shinnya, Iizuka Atsushi, Kawai Katsuyuki, Ohta Hideki

    Proceedings of the Japan National Conference on Geotechnical Engineering   38   293 - 294   2003

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    DOI: 10.11512/jiban.JGS38.0.293.0

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  • Elasto-plastic Constitutive Model Considering Decay of Structure and Iso/aniso-tropization

    Osakabe Kazuya, Kobayashi Ichizo, Iizuka Atsushi, Ohno Shintaro, Suzuki Akihiro, Ota Hideki

    Proceedings of the Japan National Conference on Geotechnical Engineering   38   283 - 284   2003

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    DOI: 10.11512/jiban.JGS38.0.283.0

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  • Mechanical influence of a large-scale excavation on the adjacent embankment Reviewed

    Kojima,K, Tateyama,M, Iizuka,A, Ohta,H, Fujita,K

    roc. of 4th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground   IS-Toulouse   2002.10

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  • A series of trial embankments of reinforced earth Reviewed

    Ohta,H, Maeda,Y, Nishimoto,T, Ohmori,K, Yamakami,T, Iizuka,A, Kobayashi,I

    Proc of 7th International Conference on Geosynthetics   307 - 312   2002.9

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  • 不飽和土の力学を用いた締固め土における圧密降伏応力の簡易予測手法 Reviewed

    5   785 - 792   2002.9

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    DOI: 10.2208/journalam.5.785

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  • 地盤沈下の予測理論と実際 Reviewed

    飯塚 敦, 村上 章, 宮田 喜壽, 中角 功

    施工過程を考慮した地盤の変形・破壊予測に関するシンポジウム発表論文集   17 - 24   2002.9

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  • 水分特性曲線ヒステリシスの表現と不飽和土の応力変化 Reviewed

    5   777 - 784   2002.9

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    The mechanical behavior of unsaturated soils strongly depends on the pore water distribution as well as the suction. The water characteristic curve (W. C. C) specifying the pore water content and the suction value plays a very important role in describing the mechanical modeling for unsaturated soils. However, the W. R. 0 shows the hysteresis loop in the wetting/drying processes. This paper emphasizes the importance of considering the hysteresis of W.C.C in the modeling. The accumulation of irreversible strains in the soil structures caused by rainfalls cannot be explained well without considering the hysteresis of W. C. C. An existing model of W. C. C is modified so as to express the accumulation of irreversible strains as the cyclic suction loading. Finally, it is shown that the modified model well explains the experimental results.

    DOI: 10.2208/journalam.5.777

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  • 施工履歴の違いを考慮した人工島の品質評価に対する検討 Reviewed

    飯塚敦, 西田博文, 河井克之, 井内崇也

    応用力学論文集   5   767 - 776   2002.9

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  • Compressive shear tests of compacted soils wrapped by geosynthetics Reviewed

    Iizuka,A, Hirata,M, Yokota,Y, Ohta,H, Kim,E.R, Kubo,T

    Proc of 7th International Conference on Geosynthetics   1133 - 1136   2002.9

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  • 地盤沈下の予測理論と実際 -施工に伴う荷重や変位の履歴による地盤応答- Reviewed

    飯塚敦, 村上章, 宮田喜壽, 中角功

    土と基礎   Vol.50 ( No.8 (Ser.No.535) )   6 - 8   2002.8

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  • 開削トンネル設計時における周辺地盤の簡易沈下予測 Reviewed

    小島謙一, 太田秀樹, 館山勝, 飯塚敦

    土と基礎   Vol.50 ( No.7 (Ser.No.534) )   28 - 30   2002.7

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  • FEM formulation for analysis of soil constitutive model with a corner on the yield surface Reviewed

    Pipapongsa,T, Iizuka,A, Kobayashi,I, Ohta,H

    Journal of Structural Engineering   Vol.48A ( 1 )   185 - 194   2002.4

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  • The relationship between the suction and the consolidation yield stress of compacted soils

    6 ( 6 )   397 - 408   2002.3

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    DOI: 10.24546/00317653

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  • Soil/water coupled dynamic F. E. analysis using an elasto-plastic constitutive model with a subloading surface Reviewed

    Atsushi IIZUKA, Shintaro OHNO, Katsuyuki KAWAI, Kazuyoshi TATEYAMA

    Journal of applied mechanics   5   601 - 610   2002

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    DOI: 10.2208/journalam.5.601

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  • Application of Dilatancy Models with Subloading Surface to Soils Reinforced by Geosynthetics

    Kim Eun-ra, Iizuka Atsushi, Hirata Masafumi, Kawai Katsuyuki

    Proceedings of the Japan National Conference on Geotechnical Engineering   37   761 - 762   2002

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    DOI: 10.11512/jiban.JGS37.0.761.0

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  • Numerical Interpretations of a Shape of Yield Surface Obtained from Stress Probe Tests

    Kobayashi Ichizo, Suzuki Akihiro, Iizuka Atsushi, Ohta Hideki, Soga Kenichi

    Proceedings of the Japan National Conference on Geotechnical Engineering   37   327 - 328   2002

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    DOI: 10.11512/jiban.JGS37.0.327.0

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  • K0-value obtained from the Sekiguchi-Ohta subloading surface model with rotational hardening concept.

    Suzuki Akihiro, Kobayashi Ichizou, Ohta Hideki, Iizuka Atsushi, Soga Kenichi

    Proceedings of the Japan National Conference on Geotechnical Engineering   37   325 - 326   2002

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    DOI: 10.11512/jiban.JGS37.0.325.0

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  • Geological approach to the void ratio distribution for aged clays based on Bjerrum's hypothesis Reviewed

    Saito,T, Iizuka,A, Kitamura,A, Ohta,H

    Journal of Geotechnical Engineering   Vol.32 ( No.3 )   153 - 164   2001.12

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  • Applicability of an elasto-plastic model for reinforced soil structures Reviewed

    Yoshida,T, Mori,K, Iizuka,A, Maegawa,F, Amano,S

    Proc. of the International Symposium on Landmarks in Earth Reinforcement (IS-Kyushu 2001)   Vol.1   507 - 510   2001.11

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    The reinforcement technique using flexible materials such as geosynthetics has been widely employed in the current engineering practice. However, the reinforcement mechanism has not revealed sufficiently, i.e. the mechanical interaction between the reinforcements and soils, the confining effect induced by reinforcements and so forth, and then it has not yet led into a proposal of rational design procedure. This paper reports in-situ loading tests carried out on the compacted soil structure reinforced by flexible beltlike materials. Elasto-plastic finite element simulations were also performed considering dilatancy characteristics of compacted soils during shearing. Throughout comparison with the field records monitored in the site and the results obtained from the conventional elastic computation, discussed are the applicability of the elasto-plastic analysis and the role of dilatancy characteristics of compacted soils in the reinforcement mechanism.

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  • セルフボーリングプレッシャーメータから得られる強度に間隙水の移動が及ぼす影響 Reviewed

    小林一三, 曽我健一, 飯塚敦, 太田秀樹, Dalton,C

    応用力学論文集   Vol.4   285 - 294   2001.10

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  • Nonlinear analysis for stress-strain-strength of clays using return-mapping algorithms Reviewed

    Pipatpongsa,T, Iizuka,A, Kobayashi,I, Ohta,H, Suzuki,Y

    Journal of Applied Mechanics   Vol.4   295 - 306   2001.10

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  • 体積変化を考慮したせん断帯生成理論 Reviewed

    森川嘉之, 飯塚敦, 太田秀樹

    応用力学論文集   Vol.4   367 - 374   2001.10

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  • Integration algorithms for soil constitutive equations with a singular hardening vertex Reviewed

    Pipatpongsa, T, Ohta, H, Kobayashi, I, Iizuka, A

    Proc. 3rd Int. Summer Symposium   201 - 204   2001.8

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  • Reinforcement effect arising from confining dilatancy by geosynthetics. Reviewed

    IIZUKA Atsushi, HIRATA Masafumi, OHTA Hideki

    Doboku Gakkai Ronbunshu   2001 ( No.680/III-55 )   15 - 28   2001.6

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    This paper discusses the geosynthetic-reinforcement effect. The reinforcing effect arises from the equilibrium of inner forces between extension forces working to the geosynthetics and stresses induced in the soil media. In this paper, a series of model tests and their numerical simulations are carried out to examine this geosynthetics-soils mechanical interaction. The compacted soils are wrapped by geosynthetics and sheared in the newly developed loading test apparatus with monitoring the deformation and stresses. It is revealed that, throughout this paper, the geosynthetic-reinforcement effect is mobilized by confining the &lsquo;dilatancy characteristics&rsquo; of compacted soils. And also, a numerical simulation technique to rationally explain the observed facts obtained from model tests is proposed in this paper.

    DOI: 10.2208/jscej.2001.680_15

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  • 異方性地盤材料の構成モデルの陰解法有限要素解析への適用 Reviewed

    ピパットポンサー ティラポン, 小林 一三, 太田 秀樹, 飯塚 敦

    第51回理論応用力学講演会講演論文集   51 ( 0 )   91 - 91   2001

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    DOI: 10.11345/japannctam.tam51.0.91.0

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  • An Observational Prediction Method of Back-Fill Settlement in Excavation Work. Reviewed

    Kenichi KOJIMA, Atsushi IIZUKA, Hideki OHTA, Masaru TATEYAMA

    Doboku Gakkai Ronbunshu   ( 694 )   67 - 79   2001

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    DOI: 10.2208/jscej.2001.694_67

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  • A repair work of a bridge abutment suffering from excessive deformation of soft clay foundation Reviewed

    Kawaida,M, Morii,Y, Horikoshi,K, Iizuka,A, Kobayashi,I, Ohta,H

    Proc. of 3rd Regional Symposium on Infrastructure Development in Civil Engineering   373 - 380   2000.11

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  • STRESS-STRAIN RELATIONSHIP FOR UNSATURATED SOIL Reviewed

    HONDA Michinori, IIZUKA Atsushi, KAWAI Katsuyuki, KARUBE Daizo

    659 ( No.659/III-52 )   153 - 164   2000.9

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  • SOIL/WATER COUPLED ANALYSIS CONSIDERING UNSATURATED PORE WATER DISTRIBUTION Reviewed

    IIZUKA Atsushi, HONDA Michinori, NISHIDA Hirofumi, KAWAI Katsuyuki, KARUBE Daizo

    659 ( No.659/III-52 )   165 - 178   2000.9

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  • Effects of some parameters on braced-excavation of soft clay by numerical studies Reviewed

    Pipatpongsa,T, Ohta,H, Iizuka,A, Hashimoto,M

    Proc. of Coastal Geotechnical Engineering in Practice (IS-Yokohama)   Vol.1   351 - 356   2000.9

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    Apart from following general outlines for input procedures and parameter findings when performing excavation analysis using FEM, some additional considerations should be taken. The influences of appropriate soil stiffness, pre-load efficiency, actual strut stiffness, soil/wall interface, crack in concrete retaining wall, and foundation piles installed before excavation have been investigated to weight the impact on analysis quality, enhancing acceptability in practice. Computed deformations and strut axial loads of a case study agreed quite well with field responses after applying these effects.

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  • 開削工事における周辺地盤変形要因に関する解析的研究

    小島 謙一, 太田 秀樹, 館山 勝, 飯塚 敦

    鉄道総合技術論文誌鉄道総研報告   14 ( 8 )   25 - 30   2000.8

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  • A SIMPLE METHOD OF BACK-FILL SETTLEMENT ASSOCIATED WITH EXCAVATION WORK

    KOJIMA Kenichi, OHTA Hideki, TATEYAMA Masaru, IIZUKA Atsushi

    Doboku Gakkai Ronbunshu   652   217 - 227   2000.6

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    The prediction of back-fill settlement due to the excavation work is getting important, particularly in the urban area. The finite element simulation would be a suitable choice to answer it. However, it is not feasible in practice to carry it out because input parameters needed in the F. E. simulation are not provided in advance in the stage of design work. This paper proposes a simple prediction method of the back-fill settlement due to the excavation work. The proposed method is built based on a lot of monitored data obtained from sites and the numerical results obtained from a series of F. E. simulations for imaginary excavation sites. It is designed to be simple and useful in the stage of design work. This method consists of two parts, prediction of the maximum amount of back-fill settlement and prospect of the distance from the retaining wall.

    DOI: 10.2208/jscej.2000.652_217

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  • 掘削工事における周辺地盤の変形予測手法の検討 Reviewed

    小島謙一, 太田秀樹, 館山勝, 飯塚敦

    土木学会論文集   ( No.652/III-51 )   217 - 228   2000.6

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  • 締固め土の圧縮挙動に関する弾朔性構成モデルの適用

    本田 道織, 軽部 大蔵, 飯塚 敦, 河井 克之

    神戸大学大学院自然科学研究科紀要   18-B   51 - 59   2000.4

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  • 道路盛土の除去およびEPS置換に伴う軟弱地盤の挙動解析 Reviewed

    川井田実, 森川慶行, 堀越研一, 飯塚敦, 太田秀樹

    土木学会論文集   ( ,No.645/III-50 )   209 - 221   2000.3

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  • Shear strength mobilization in shear box test under constant volume Reviewed

    Kobayashi,I, Iizuka,A, Ohta,H, Hirata,M

    Proc. of International Symposium on Slope Stability Engineering, Geotechnical and Geoenvironmental Aspects (IS-Shikoku)   763 - 768   1999.11

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    The specification of strength parameters is an important task in the design work of slope stability. Usually laboratory shear tests are employed to determine the strength parameters. The specimen in the laboratory tests is intended and generally assumed to represent a single point in the in-situ soil medium. And, the strength parameters obtained are interpreted as material properties of the soil element. However, since the uniformity of stress/strain distribution within the specimen is hardly achieved during shearing, the strength parameters thus obtained cannot be essentially regarded as material properties. In this paper, the shear box test under the condition of constant volume is considered and the distribution of stress/strain within the specimen is rigorously examined through numerical simulations based on finite incremental deformation theory. The mobilization of strength is explained associated with the development of shear bands in the specimen during shear.

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  • ダイレタンシーを考慮したジオシンセティックス補強盛土有限要素解析 Reviewed

    平田 昌史, 飯塚 敦, 太田 秀樹, 山上 尚幸, 横田 善弘, 大森 晃治

    土木学会論文集   No.631/III-48   179 - 192   1999.9

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  • 土留め掘削周辺地盤の挙動と三次元解析事例 Reviewed

    杉江茂彦, 上野孝之, 太田秀樹, 飯塚敦, 秋野矩之, 崎本純治

    土と基礎   Vol.47-9 ( No.498 )   13 - 16   1999.7

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  • 粘土供試体の圧縮せん断破壊-観察とシミュレーション- Reviewed

    飯塚 敦, 小林 一三, 太田 秀樹

    土と基礎   Vol.47 ( No.5 )   21 - 24   1999.5

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  • 正規粘土供試体せん断時における局所変形の遷移 Reviewed

    小林 一三, 飯塚 敦, 太田 秀樹

    土木学会論文集   No.617/III-46   1 - 18   1999.3

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  • Dilatancy localization in clay specimen under shearing Reviewed

    Iizuka,A, Kobayashi,I, Ohta,H

    Proc. of 4th International Workshop on Localization and Bifurcation Theory for Soils and Rocks   345 - 354   1998.11

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    The strain localization developing inside clay specimens during shear is examined through the experimental observation and numerical F.E. simulation. In the experiment, clay specimens of column and hollow-cylinder shapes are uniaxially sheared and the development of shear bands is observed. The numerical simulation of compression shear is carried out under the plane strain condition for normally consolidated clay specimens with impermeable boundaries by using the elasto-plastic soil/water coupled finite element computation technique based on the finite deformation theory. Although the geometric boundary conditions are different in the experiment and simulation, discussed are the development of shear bands on/in the specimen and the transition of the localization mode which are found commonly in the experiment and simulation.

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  • Evaluation of undrained strengths obtained from three shear tests Reviewed

    Iizuka,A, Hirose,T, Shin,D, Ohmori,K, Ohta,H

    Proc. of 1st International Conference on Site Characterization   Vol.2   1265 - 1271   1998.4

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    This paper presents evaluation of undrained strengths obtained from unconfined compression tests, constant volume shear box tests and field vane shear tests which were carried out in a site. Theoretical expressions of these undrained strengths derived from the elasto-plastic constitutive model are summarized. And discussed are the correction factors that help converting the undrained strengths obtained from tests to ideal undrained strengths comparable to the theoretical strengths. Throughout comparison of the measured strengths and the theoretical predictions, reliable specification of the constitutive parameters for the model from the measured strengths is examined.

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  • Interpretation of in-situ and laboratory tests on soft clays Reviewed

    Ohta,H, Iizuka,A, Yamakami,T, Ohmori,K, Morikawa,Y

    Proc. of 1st International Conference on Site Characterization   Vol.1   403 - 408   1998.4

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    Mechanical properties of soft clays, such as deformability and strength, are estimated using data obtained from in-situ and laboratory tests. These test methods were developed through experience gained in the development of geotechnical engineering. The undrained strength, for instance, of a soft clay estimated by using any one of these in-situ or laboratory tests is not usually the same as that estimated by another one of these tests. There are many possible reasons for the apparently different response of the clay to each of these testing methods. The differences caused by factors such as disturbance, stress history, detailed testing procedures, are sometimes surprisingly influential. This paper shows examples of the above mentioned complications encountered in engineering practice. The paper also describes the interpretation of such complications by means of an elasto-plastic constitutive model which was proposed by Sekiguchi and Ohta in 1977.

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  • Application of dilatancy models to soils reinforced by geosynthetics Reviewed

    Ohta,H, Hirata,M, Iizuka,A, Yamakami,T, Yokota,T, Ohmori,K

    Proc. of 6th International Conference on Geosynthetics   Vol.2   551 - 556   1998.3

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  • 粘性土の等体積一面せん断強さ Reviewed

    森川 嘉之, 古田 康裕, 飯塚 敦, 太田 秀樹

    土木学会論文集   No.582/III-41   173 - 182   1997.12

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  • 土/水連成有限要素解析に基づいた限界盛土高さ推定法 Reviewed

    小林 一三, 飯塚 敦, 太田 秀樹

    土木学会論文集   No.575/III-40   207 - 217   1997.9

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  • Seismic deamplifying effect of soft clay layers Reviewed

    Ohta,H, Hagino,Y, Udaka,T, Demura,Y, Iizuka,A

    Proc. of 14th International Conference on Soil Mechanics and Foundation Engineering (ICSMFE)   Vol.2   859 - 862   1997.7

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    The seismic deamplifying effect of soft clay layers is described. This deamplifying effect of soft clay layers on the propagated waves due to an earthquake is significantly influenced by the degree of consolidation of the soft clay underlying the site. In this paper, two buildings on Rokko Island are analysed. First, the static soil/water coupled analyses are carried out to assess the initial equilibrium conditions of the site just before the earthquake and, secondly, the dynamic response analyses are performed based on the data obtained from the static analyses. The emphasis is placed on evaluating the factor of safety against liquefaction at the various stages of consolidation and at the completion of consolidation. The results seem to be consistent with the overall phenomena observed in Port island and Rokko Island.

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  • ジオシンセティックスで補強された盛土構造物の変形挙動 Reviewed

    Goren,S, 太田秀樹, 飯塚敦, 山上尚幸

    地盤工学における逆解析の適用と施工管理に関するシンポジウム論文集   145 - 150   1997.4

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  • 軟弱地盤上に施工された高速道路盛土による変形とその数値シミュレーション Reviewed

    太田 秀樹, 飯塚 敦, 石川 勇, 菅井 一嘉

    地盤工学における逆解析の適用と施工管理に関するシンポジウム論文集   123 - 132   1997.4

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  • 沈下予測解析における基準と初期条件の重要性 Reviewed

    飯塚敦

    土と基礎   ( 2 )   11 - 14   1997.2

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  • Numerical simulation of beam-shaped soil structure reinforced by geosynthetics Reviewed

    Ohta,H, Goren,S, Iizuka,A, Yamakami,T, Yamagishi,K, Moroto,Y

    Proc. of International Symposium on Earth Reinforcement (IS-Kyushu)   Vol.1   255 - 260   1996.11

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    A full-scale model test was conducted to investigate the mechanism of soil reinforcement by geosynthetic materials, A beam shaped soil structure reinforced by geosynthetics was designed and the global momentum stiffness was examined. This paper presents a brief description of the theoretical estimate of the global momentum stiffness of the reinforced structure for the laboratory model test and the numerical simulation of the full scale model test. The numerical simulation and the field test indicate that the effect of soil confinement by the geosynthetic material was particularly significant. A comparison of the numerical and field results is also presented.

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  • 間隙水の移動を考慮した極限解析 Reviewed

    小林 一三, 飯塚 敦, 太田 秀樹

    第40回地盤工学シンポジウム論文集   237 - 242   1995.11

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  • 梁形状のジオシンセティックス補強土構造物の力学挙動 Reviewed

    太田秀樹, Goren,S, 飯塚敦, 山上尚幸, 山岸克彰, 諸戸靖史

    第40回地盤工学シンポジウム論文集   331 - 338   1995.11

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  • “自然堆積粘土に対するベーンせん断試験結果の解釈”に対する討議回答 Reviewed

    太田 秀樹, 西原 晃, 飯塚 敦, 杉江 茂彦

    土木学会論文集   No.517,III-31   209 - 215   1995.6

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  • 一面せん断試験の力学的意義と結果の解釈 Reviewed

    太田 秀樹, 森川 嘉之, 勝山 克二, 森田 悠紀雄, 飯塚 敦

    直接型せん断試験の方法と適用に関するシンポジウム論文集   147 - 154   1995.2

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  • Pore water migration during plane strain triaxial test Reviewed

    Sugie,S, Iizuka,A, Ohta,H

    Proc. of International Symposium on Compression and Co nsolidation of Clayey Soils (IS-Hiroshima)   Vol.1   189 - 194   1995

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  • 都市型CAESタンクの周辺軟岩安定性に関する数値解析-関口・太田の弾粘塑性モデルによる予備的考察- Reviewed

    大森 剛志, 飯塚 敦, 太田 秀樹, 林 正夫

    岩の力学'95(岩の力学連合会、東京)   1022 - 1025   1995

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  • Non-linear soil/water coupled formulation and choice of element type used in deformation/stability analysis Reviewed

    Sugie,S, Iizuka,A, Ohta,H

    Proc. of International Conference on Computational Methods in Structure and Geotechnical Engineering   Vol.4   1516 - 1520   1994.12

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  • 海成粘土の一面せん断特性と一軸圧縮強度・ベーン強度の力学的関連性 Reviewed

    太田 秀樹, 勝山 克二, 森田 悠紀雄, 飯塚 敦

    第39回土質工学シンポジウム論文集   187 - 194   1994.11

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  • 粘性土の弾朔性構成式の一表現 Reviewed

    飯塚 敦, 前川 英範, 森川 嘉之

    地盤の破壊とひずみの局所化に関するシンポジウム論文集   135 - 142   1994.10

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  • 破壊近傍での有限要素の特性変化 Reviewed

    飯塚 敦, 太田 秀樹, 杉江 茂彦

    地盤の破壊とひずみの局所化に関するシンポジウム論文集   181 - 188   1994.10

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  • 3次元土/水連成FEMにおける種々の離散化と計算精度・効率 Reviewed

    杉江 茂彦, 飯塚 敦, 太田 秀樹

    構造工学における数値解析法シンポジウム論文集   18   33 - 38   1994.7

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  • Mobilization mechanism of vane shear strength revealed in K0 consolidated clayey ground. Reviewed

    Sugie Shigehiko, Iizuka Atsushi, Ohta Hideki

    Doboku Gakkai Ronbunshu   No.487/III-26 ( 487 )   227 - 236   1994.3

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    This paper describes the mobilization mechanism of vane shear strength revealed in the naturally consolidated clay deposits. The vane shear test has been successfully simulated by the 3-dimensional soil/water coupling finite element program, DACSAR, and through this numerical analysis the mobilization mechanism of vane shear strength has been explained. After verifying the finite element modelling, discussed are, mainly, the development of shear stresses along the blade of vane, their distribution, the effects of partial drainage and material viscosity. The in-situ vane shear test hardly escapes from much influence both of partial drainage and material viscosity. In particular, the partial drainage of pore water yields the difference between strengths at the top and/or bottom edges of a vane blade and at the side edge of a vane blade.

    DOI: 10.2208/jscej.1994.487_227

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  • Progressive failure of soft clay under embankment Reviewed

    Ohta,H, Iizuka,A, Monda,S, Kuwahara,M, Muta,T

    Proc. of 13th International Conference on Soil Mechanics and Foundation Engineering (ICSMFE)   Vol.2   751 - 754   1994.1

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  • 自然堆積粘土に対するベーンせん断試験結果の解釈 Reviewed

    太田 秀樹, 西原 晃, 飯塚 敦, 杉江 茂彦

    土木学会論文集   No.481/III-25   145 - 154   1993.12

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  • ジオテキスタイルで補強された複合地盤の曲げ剛性

    太田 秀樹, 山上 尚幸, GOREN S, 石垣 勉, 飯塚 敦

    金沢大学工学部紀要   第26巻(通巻第65号)   19 - 26   1993.3

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  • ハダカ中空円筒供試体によるKo圧密非排水せん断試験装置

    太田 秀樹, 山上 尚幸, 飯塚 敦, 坪内 正記, 武内 秀樹

    金沢大学工学部紀要   27 - 33   1993.3

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  • Use of field vane test data in analysis of soft clay foundation Reviewed

    Ohta,H, Nishihara,A, Iizuka,A, Morita,Y

    Proc. of C.P.Wroth Memorial Symposium: Predictive soil mechanics   387 - 405   1992.7

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  • The effect of stress induced anisotropy on shear band formation Reviewed

    Iizuka,A, Yatomi,C, Yashima,A, Sano,I, Ohta,H

    Archive of Applied Mechanics   62   104 - 114   1992.3

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    This paper describes the effect of non-coaxiality arising from material anisotropy on bifurcation phenomena such as shear band formation. The elasto-plastic model originally proposed by Sekiguchi and Ohta [7] is one of the typical models which include anisotropy and it is used to examine the effect of anisotropy on shear band formation. First, we shall extend this elasto-plastic model for infinitesimal strain to a model for finite strain and discuss the mathematical structure of this model. The stress induced anisotropy is found to bring about a vertex-like effect, such as the non-coaxiality between the Cauchy stress tensor and a plastic stretching tensor, into the constitutive relation. Then, we shall examine the effect of this non-coaxiality on bifurcation conditions in relation to the material rigidity which changes with the angle of simple shear. Finally, it will be concluded that this non-coaxiality arising from the anisotropy does not contribute much to triggering instability by localization of the deformations which result in shear band formation, while on the other hand, the non-coaxiality due to the yield vertex effect is rather inclined towards instability by localization of the deformations.

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  • 3-D analysis of soil/water coupling problems using elasto-viscoplastic constitutive relationship Reviewed

    Ohta,A, Iizuka,A, Omote,Y, Sugie,S

    Proc. of International Conference on Computer Methods and Advances in Geomechanics   Vol.2   1191 - 1196   1991.5

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  • Deformation analysis of anisotropically consolidated clay foundation loaded by 5 embankments Reviewed

    Ohta,H, Iizuka,A, Mitsuhashi,Y, Nabetani,M

    Proc. of International Conference on Computer Methods and Advances in Geomechanics   Vol.2   1017 - 1022   1991.5

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  • Design strength Su derived from pressuremeter tests Reviewed

    Ohta,H, Iizuka,A, Nishihara,A, Fukagawa,R, Morita,Y

    Proc. of International Conference on Computer Methods and Advances in Geomechanics   Vol.1   273 - 278   1991.5

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  • Analysis of post peak behaviour of foundations Reviewed

    Ichimoto,E, Nozu,M, Okuyama,K, Ohta,H, Iizuka,A

    Proc. of International Conference on Computer Methods and Advances in Geomechanics   Vol.2   1165 - 1170   1991.5

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  • ひずみ軟化を示す地盤挙動の有限要素解析 Reviewed

    一本 英三郎, 野津 光夫, 奥山 一典, 太田 秀樹, 飯塚 敦

    第35回土質工学シンポジウム論文集   39 - 46   1990.11

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  • Strength of compacted earth fill Reviewed

    Ohta,H, Kaneko,Y, Ohtake,M, Iizuka,A

    Proc. of 11th International Conference of the Terrian-Vehicle Systems   1123 - 1128   1990.8

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  • Effects of drainage on interpretation of pressuremeter tests in clay Reviewed

    Fukagawa,R, Ohta,H, Iizuka,A, Nishihara,A, Morita,Y

    Proc. of 3rd International Conference on Pressuremeters   189 - 198   1990.4

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  • Shear bands formation numerically simulated by a non-coaxial Cam-clay model Reviewed

    Yatomi,C, Yashima,A, Iizuka,A, Sano,I

    Soils and Foundations   Vol.29 ( No.4 )   1 - 13   1989.12

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  • せん断(すべり線)の生成機構と応力誘導異方性 Reviewed

    飯塚 敦, 矢富 盟祥, 八嶋 厚, 佐野 郁雄, 太田 秀樹

    第34回土質工学シンポジウム論文集   225 - 232   1989.11

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  • 平面ひずみ試験におけるせん断帯生成シミュレーション Reviewed

    八嶋 厚, 矢富 盟祥, 飯塚 敦, 佐野 郁雄, 太田 秀樹

    第34回土質工学シンポジウム論文集   pp.233-240   233 - 240   1989.11

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  • 大深度竪坑の掘削シミュレーションと施工上の問題点 Reviewed

    太田秀樹, 松本樹典, 飯塚敦

    第34回土質工学シンポジウム論文集   287 - 294   1989.11

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  • General theory of shear bands formation by a non-coaxial Cam-clay model Reviewed

    Yatomi,C, Yashima,A, Iizuka,A, Sano,I

    Soils and Foundations   Vol.29 ( No.3 )   41 - 53   1989.9

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  • 種々の掘削工法を検討できる山留め計算法 Reviewed

    柏木淳男, 熊谷俊雄, 菅井正澄, 飯塚敦

    土と基礎   Vol.37 ( No5 )   47 - 52   1989.5

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  • 不撹乱試料の残留有効応力と1軸圧縮強度 Reviewed

    太田 秀樹, 飯塚 敦, 西原 晃, 森田 悠紀雄, 深川 良一, 荒井 克彦

    サンプリングシンポジウム論文集   35 - 40   1989.3

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  • UNCONFINED COMPRESSION STRENGTH OF SOFT AGED CLAYS Reviewed

    Ohta,H, Nishihara,A, Iizuka,A, Morita,Y, Fukagawa,R, Arai,K

    Proc. of 12th International Conference on Soil Mechanics and Foundation Engineering (ICSMFE)   Vol.1   71 - 74   1989

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  • Soil-structure interaction related to actual construction sequences Reviewed

    Ohta, H, Iizuka

    Proc. of 6th International Conference on Numerical Methods in Geomechanics   Vol.3   2043 - 2050   1988.4

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  • Coupled elasto-plastic deformation-flow finite element analysis using imaginary viscosity procedure Reviewed

    Shoji,M, Matsumoto,T, Morikawa,S, Ohta,H, Iizuka,A

    Proc. of 6th International Conference on Numerical Methods in Geomechanics   Vol.1   299 - 304   1988.4

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  • Coupled elasto-plastic deformation-flow finite element analysis using "imaginary viscosity method". Reviewed

    SHOJI Mikio, MATSUMOTO Takashi, OHTA Hideki, IIZUKA Atsushi

    Doboku Gakkai Ronbunshu   No.388/III-8 ( 388 )   121 - 130   1987.12

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    Coupled elasto-plastic deformation-flow finite element analysis has been frequently used for the prediction of displacements, stresses and pore water pressures in geotechnical problems. However, the analysis is not suitable for the stability problems since its numerical results often become unstable after the stress paths of elements arrive at the critical state.<br>The analytical method including &ldquo;imaginary viscosity method&rdquo; which is a usual viscoplasticity computation scheme is developed to analyse the behavior of soil from the initial stress stage to the failure one.<br>In order to assess the validity and the applicability of this method, a problem of bearing capacity and an actual embankment are examined.

    DOI: 10.2208/jscej.1987.388_121

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  • A Determination Procedure of Input Parameters In Elasto-Viscoplastic Finite Element Analysis Reviewed

    Atsushi Iizuka, Hideki Ohta

    Soils and Foundations   27 ( 3 )   71 - 87   1987.9

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    DOI: 10.3208/sandf1972.27.3_71

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  • Bearing capacity and stress distribution in K0-consolidated clayey ground. Reviewed

    IIZUKA Atsushi, YOSHIMINE Tohru, OHTA Hideki, HATA Shojiro

    Doboku Gakkai Ronbunshu   No.382/III-7 ( 382 )   255 - 263   1987.6

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    The finite element technique using the imaginary viscoplastic calculation scheme is employed to compute the perfect plasticity region such as failure state. And the calculation of bearing capacity of footing in anisotropic normally consolidated ground is performed by incorporating theoretical equation of anisotropic undrained shear strength into yield function. The influences of anisotropy of ground are analytically investigated with taking notice of stress distribution near and in the applied footing stress at collapse of ground.

    DOI: 10.2208/jscej.1987.382_255

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  • 沈下予測解析における基準と初期条件の重要性 Reviewed

    IIZUKA Atsushi

    土と基礎   No.2,pp.11-14   1972.2

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Books

  • 美しい未来をつくるひとのための15のはなし

    祇園, 景子( Role: Contributor第5章 安全と未来,15未来に対する私たちの責任(飯塚敦))

    神戸大学出版会,神戸新聞総合出版センター (発売)  2021.3  ( ISBN:9784909364135

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    Total pages:140p   Responsible for pages:pp.118–125   Language:Japanese  

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  • Geomechanics from micro to macro : proceedings of the TC105 ISSMGE International Symposium on Geomechanics from Micro to Macro, Cambridge, UK, 1-3 September 2014

    (Chapter 208. A method of measuring the specific surface area of bentonite for evaluation of the hydraulic performance of bentonite engineered barriers)

    CRC Press  2014  ( ISBN:9781138027077

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    Total pages:2 v.   Responsible for pages:pp.1285–1290   Language:English  

    DOI: 10.1201/b17395-232

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  • 国土強靱化,日本を強くしなやかに (その3)

    自由民主党国土強靭化総合調査会, 国土強靱化総合研究所( Role: Contributor15.防災・減災における国土強靱化について,-超広域・複合災害に備える-)

    国土強靱化総合研究所,相模書房 (発売)  2013.11  ( ISBN:9784782413050

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    Total pages:冊   Responsible for pages:pp.343-366   Language:Japanese  

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  • Geotechnical predictions and practice in dealing with geohazards

    Chu, Jian, Wardani, Sri P. R., Iizuka, Atsushi( Role: Joint editorPrologue. Chapter 1. Chapter 7. Chapter 10. Chapter 11. Chapter 14.Chapter 15. Chapter 22.)

    Springer  2013.7  ( ISBN:9789400756748

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    Total pages:xxiii, 394 p.   Language:English   Book type:Scholarly book

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  • Chapter 13 Soil Mechanics "Constitutive Modelling for Soft Cohesive Soils", Geotechnics and Earthquake Geotechnics towards Global Sustainability

    Ohta, H, Iizuka, A, Ohno, S(Chapter 13 Soil Mechanics "Constitutive Modelling for Soft Cohesive Soils")

    Springer Dordrecht Heidelberg London New York  2011.3  ( ISBN:9789400704695

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    Total pages:294   Responsible for pages:pp.231-251   Language:English   Book type:Scholarly book

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  • 設計用地盤定数の決め方-土質編-

    MISHIMA Nobuo, IIZUKA Atsushi( Role: Joint author)

    地盤工学会  2007.12  ( ISBN:9784886440792

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    Responsible for pages:p.82 pp.128-137   Language:Japanese   Book type:Scholarly book

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  • 地盤技術者のためのFEMシリーズ② 弾塑性有限要素法がわかる

    UGAI Keizo, IIZUKA Atsushi( Role: Joint author)

    地盤工学会  2003.9  ( ISBN:4886440673

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  • Unsaturated Soils -Geotechnical and Geoenvironmental Issues-

    KARUBE Daizo, IIZUKA Atsushi, KATO Shoji, KAWAI Katsuyuki, TATEYAMA Kazuyoshi( Role: Joint author)

    TC6 of International Society of Soil Mechanics and Geotechnical Engineering  2003.4 

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  • 地盤工学理論シリーズ 地盤の変形解析

    OHTA Hideki, IIZUKA Atsushi( Role: Joint author)

    地盤工学会  2002.8  ( ISBN:4886449506

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  • 地盤力学

    SHIBATA Toru, IIZUKA Atsushi( Role: Joint author)

    山海堂  2000.3  ( ISBN:4381012747

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  • 構造工学シリーズ7 構造工学における計算力学の基礎と応用

    MASUDA Nobutoshi, IIZUKA Atsushi( Role: Joint author)

    土木学会  1996.12  ( ISBN:4810601730

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  • 地盤の破壊とひずみの局所化

    OKA Fusao, IIZUKA Atsushi( Role: Joint author)

    土質工学会  1994.10  ( ISBN:4886440487

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  • Mechanical Analysis of Sliding Phenomena Associated with Increased Pore Water Pressure in the Decollement

    高橋亮太, 橘伸也, 飯塚敦, 杉山友理

    地盤工学研究発表会(Web)   58th   2023

  • デジタルツインに基づくスマート防災がもたらすパラダイムシフト

    飯塚 敦

    月刊フェスク   22 ( 12月 )   26 - 31   2022.12

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  • 【神戸大学コラム 安心の素】災害リスク 定量化の試み

    飯塚敦

    神戸新聞   2020.9

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  • ベイス推定を用いた災害即時の被害予測による応急対応タイムラインの実効性の向上

    飯塚敦

    高速道路と自動車   63 ( 9 )   9 - 10   2020.9

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  • Paradigm shift of disaster prevention and mitigation by city scale simulation, Special Contribution

    Iizuka,A

    IPA News Letter   5   5 - 8   2020.6

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  • 受け身の「受注」から課題解決型の「提案」へ - 都市丸ごとシミュレーション技術の活用 -

    飯塚 敦

    土木学会誌   105 ( 1 )   36 - 39   2020.1

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  • 研究報告(都市丸ごとのシミュレーション技術研究組合)

    飯塚敦

    神戸大学暁木会ニュース   Vol.41   2020

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  • 報告,不飽和土の圧縮特性と締固め曲線との関連性

    本田道識, 飯塚敦

    地盤工学会誌   67 ( No.9、Ser。No.740 )   28 - 31   2019.9

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  • Part 1特別寄稿 「神戸モデル」の社会実装 -3次元都市丸ごとのシミュレーション技術による防災・減災パラダイムシフト-

    飯塚敦

    JACIC情報   120   9 - 13   2019.8

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  • 海底地盤の原位置強度推定方法に関する解析的検討

    杉山友理, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   53rd   2018

  • 地層処分における緩衝材の再冠水挙動に関する解析的検討

    吉野修, 石山宏二, 金澤伸一, 飯塚敦

    西松建設技報(CD-ROM)   40   2017.6

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  • デコルマ帯におけるスロースリップの弾塑性論的解釈

    小松美樹, 杉山友理, 橘伸也, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   52nd   2017

  • 深海底地盤からのサンプリング試料のモデル化に関する考察

    田窪尭, 岡田真理子, 杉山友理, 橘伸也, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   52nd   2017

  • 様々な応力条件におけるB値測定手法の繰返し載荷の影響

    上原拓真, 宇治亮佑, 杉山友理, 橘伸也, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   52nd   2017

  • 溶存気体の気化が真空圧密時の地盤内圧力変化に及ぼす影響

    杉山友理, 長浦崇晃, 竹山智英, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   52nd   2017

  • 不飽和地盤の液状化強度発現に関する解析的研究

    長浦崇晃, 杉山友理, 竹山智英, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   52nd   2017

  • 土の骨格構造の発達・劣化を考慮した弾・粘塑性構成モデルの検討

    平田 昌史, 飯塚 敦, 太田 秀樹

    前田建設技術研究所報   Vol.57   14 - 14   2016

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  • 海底地盤から採取したサンプリング試料の強度発現メカニズム

    杉山友理, 中谷奈央, 竹山智英, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   51st   2016

  • 間隙保水特性と非可逆変形特性がB値発現に及ぼす影響

    宇治亮佑, 杉山友理, 田中博之, 竹山智英, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   51st   2016

  • デコルマ帯における固着メカニズムの解明

    麻生勇人, 杉山友理, 佐々木陽亮, 竹山智英, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   51st   2016

  • 論説 実務における数値解析技術の国際展開

    飯塚 敦

    地盤工学会誌,10月号   64 ( 10 )   6 - 9   2016

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  • 性能設計化地層処分技術への期待

    Vol.70 ( No.3 )   8 - 13   2015.3

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  • 応力履歴がB値発現に及ぼす影響(実験)

    玉井三友紀, 杉山友理, 田中博之, 河井克之, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   50th   2015

  • 応力履歴がB値発現に及ぼす影響(解析)

    田中博之, 杉山友理, 河井克之, 飯塚敦, 玉井三友紀

    地盤工学研究発表会発表講演集(CD-ROM)   50th   2015

  • 深海底デコルマ帯の変質を考慮したせん断破壊モデル

    戎健次, 杉山友理, 佐々木陽亮, 飯塚敦, 河井克之

    地盤工学研究発表会発表講演集(CD-ROM)   50th   2015

  • FORMULATION OF THE ELASTO-VISCOPLASTIC CONSTITUTIVE MODEL USING THE VISCOUS SURFACE MODEL CONCEPT

    56   8p   2015

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  • スメクタイトの変質作用がデコルマ帯におけるせん断特性に及ぼす影響

    佐々木陽亮, 杉山友理, 戎健次, 飯塚敦, 河井克之

    地盤工学研究発表会発表講演集(CD-ROM)   50th   2015

  • 防災・減災に対する国土強靭化

    3 - 4   2014.4

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  • タイ東北部における塩害抑制手法の検討

    田中琢, 杉山友理, 野村瞬, 飯塚敦, 河井克之

    地盤工学研究発表会発表講演集(CD-ROM)   49th   2014

  • 超広域・複合災害に備える:第1回南海トラフ地震(平成26年2月18日,3面),第2回科学的知見による被害想定(平成26年2月25日,6面),第3回レジリエントな国土強靭化(平成26年3月4日,6面),第4回専門的知見の総結集(平成26年3月11日,6面)

    飯塚 敦

    自由民主党機関紙「自由民主」連載記事   2014

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  • 津波堆積物とその特性 (< 特集> 汚染土壌・廃棄物等の処理)

    高井敦史, 肴倉宏史, 八村智明, 打木弘一, 大嶺聖, 飯塚敦

    地盤工学会誌   Vol.62 ( No.2 )   16 - 19   2013

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  • Central pressure drop induced by passive arch action of materials prone to liquefaction underneath embankments due to basal settlement

    Pipatpongsa Thirapong, Takeyama Tomohide, Iizuka Atsushi, Ohta Hideki

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan   62 ( 0 )   114 - 114   2013

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    After the Great East Japan Earthquake occurred on 11 March 2011, many earthquake-induced damages of levees and reclaimed lands were reported. According to the investigation to the failure characteristic of levees summarized by Tohoku Regional Development Bureau of MLIT, damages caused by liquefaction of foundation ground would involve basal settlement and saturated condition of loosening construction materials inside levees submerged under water. This study aims to highlight that initial stress states influenced by passive arch action across a basal deflection plays a dominant role in mechanisms of weakening resistance against liquefaction and will contribute to embankments stability evaluation against earthquake.

    DOI: 10.11345/japannctam.62.0.114.0

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  • 土構造物における観測化施工-性能設計下における建設イノベーションを目指して

    飯塚 敦

    ベース設計資料,No.158土木編(2013年後期版)   ( No.158 )   56 - 59   2013

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  • 土壌種類に起因する塩類の移動性の違い

    杉山友理, 野村瞬, 飯塚敦, 河井克之

    土木学会年次学術講演会講演概要集(CD-ROM)   68th   2013

  • 東日本大震災の津波による地盤塩害及び土壌汚染調査・分析

    杉山友理, 野村瞬, 飯塚敦, 河井克之, 橘伸也, 金澤伸一, 竹山智英

    理論応用力学講演会講演論文集(Web)   62nd   2013

  • 圧密沈下(2)(4.地盤挙動,総括,<特集>第47回地盤工学会研究発表会)

    飯塚 敦

    地盤工学会誌   60 ( 12 )   17 - 17   2012

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  • 沈降海浜部地盤内の塩分移動予測及び一本松保護

    杉山友理, 河井克之, 野村瞬, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   47th   2012

  • 東日本大震災の津波による地盤塩害の調査・分析

    野村瞬, 河井克之, 杉山友理, 飯塚敦

    地盤工学研究発表会発表講演集(CD-ROM)   47th   2012

  • 東日本大震災における津波由来土壌汚染調査

    杉山友理, 野村瞬, 飯塚敦, 河井克之, 橘伸也, 金澤伸一, 竹山智英

    土木学会年次学術講演会講演概要集(CD-ROM)   67th   2012

  • 国際的な性能設計化の潮流における地盤解析技術の役割

    飯塚 敦

    土木技術 7月号   66 ( 7 )   23 - 27   2011.7

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  • 地盤工学における数値解析技術

    飯塚 敦

    地盤工学会60周年記念号,地盤工学会誌   58 ( 1 )   40 - 41   2010.1

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  • 地盤変状・塩害シミュレータを用いた合意形成の試み

    飯塚敦

    平成22年度 第28回神戸大学工学部公開講座・ひょうご講座,テーマ:スーパーコンピューティングが拓く明日の暮らし-システム情報学研究科発足によせて-   11 - 16   2010

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  • 不飽和土の力学理論から見た土の締固め

    河井克之, 金澤伸一, 飯塚敦

    基礎工   7   32 - 35   2009.6

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  • 二次元砂山における静止土圧係数解析の原理

    ピパットポンサー ティラポン, ヘン ソクビル, 飯塚 敦, 太田 秀樹

    土木学会応用力学論文集   12   383 - 394   2009

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  • Analyses of pressure distribution under 2D sand heap by considering arching effect

    Pipatpongsa Thirapong, Heng Sokbil, Ohta Hideki, Iizuka Atsushi

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan   58 ( 0 )   190 - 190   2009

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    Statics of a sand heap under gravity associates to stress indeterminacy. The additional relationship is usually given by constitutive relations. Thus, radial stress field function satisfying plane equilibrium, constitutive relation and stress initial-boundary condition can provide a basic solution. Since stress distribution in sand heap is also depended on stress history during formation, therefore it is difficult to specify the constitutive relation which can characterize this complicated problem. The recent researches has linked arching criterion to describe a local constitutive relation and successfully captured a phenomenon of vertical pressure dip. However, a clear degree of arching effect to a stress distribution beneath the base of the heap has not been clarified. This study investigated the influence of arch shapes formed in sand heap and found particular patterns which are acceptably agreed with the experimental data. Therefore, arch formed during formation could be considered as stress memories of sand heap.

    DOI: 10.11345/japannctam.58.0.190.0

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  • Study of the stratigraphic architecture resistant for salt damage and the method to purify salty ground

    Katsuyuki KAWAI, Shun NOMURA, Shintaro OHNO, Pipatpongsa THIRAPONG, Shinya TACHIBANA, Shinichi KANAZAWA, Atsushi IIZUKA

    Journal of Applied Mechanics JSCE   12   421 - 428   2009

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  • 平成19年度地盤工学会技術開発賞を受賞して,学会賞受賞報告

    太田秀樹, 飯塚敦

    地盤工学会誌   Vol.56 ( No.8 )   52 - 52   2008.8

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  • 密な豊浦砂の降伏面と塑性ひずみ方向についての実験的検討

    OHKAWA Hiroshi, KUWANO Jiro, IIZUKA Atsushi, KUSAKABE Osamu, OHTA Hideki

    土/水連成有限要素解析を用いた各種外的要因による地盤内水分布変化   CD-ROM(pp.399-400)   2008.7

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  • 地盤工学の限界と可能性 (技術者交流特別セッション,< 小特集> 第 42 回地盤工学研究発表会)

    高橋章浩, 本多眞, 飯塚敦, 宮田喜壽

    土と基礎   Vol.55 ( No.12 )   14 - 16   2007.12

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  • 地球環境解析学―まずは小さな一歩から

    飯塚 敦

    神戸大学最前線   22 - 23   2007.9

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  • タイ東北部の塩害調査と「ジグソー・ピーシス作戦」,論説

    THIRAPONG Pipatpongsa, IIZUKA Atsushi, KAWAI Katsuyuki

    Vol.55 ( No.3,Ser.No.590 )   22 - 24   2007.3

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    By a consequence of surveys on salt damage areas in the northeastern part of Thailand during October, 13-20, 2005 and November 26-29, 2006, a co-organized workshop on numerical method for unsaturated soil behaviors prediction was held in Bangkok on November 27, 2006. The sites and related organizations were visited to investigate the backgrounds of salt disaster. It was found that though each organization has clear different missions, there are some missing links among organizations to solve the salt disaster which is caused by multiple factors. It is expected that the workshop will be benefit to Thai experts while promoting mutual cooperation together.

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    Other Link: http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100542937

  • On Coming New Short Courses by the JGS

    IIZUKA Atsushi

    Vol.55 ( No.1,SerNo.588 )   6 - 7   2007.1

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    This manuscript discusses the current problem in the short courses held by the Japanese Geotechnical Society and proposes a reform plan. Each short course held by the headquarters of JGS has been planned and managed under a single year system, considering the current trend and needs in our geotechnical engineering field. However, the number of participants has decreased year by year and the income and expenditure balance has been getting worse. A drastic reform is required. Then, the committee for the JGS short course organized a working group, in which the problems are examined and a desirable reform plan is proposed. In this manuscript, a report from the working group, that is, all short courses should be categorized and rearranged into several main courses and so on, is presented.

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  • 平成18年(2006年)5月27日ジャワ島中部地震被害調査速報

    飯塚 敦

    自然災害科学   Vol.25 ( No.2 )   233 - 249   2006.9

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  • 価値観の混沌を抜け出し,次世代の手本となるトップランナーたれ,土木学会誌×建築雑誌 共同企画「子どもたちへのメッセージ」,40人の提言

    飯塚 敦

    土木学会誌,Vol.91,p.21 建築雑誌,Vol.121,No.1548,p.22   2006.6

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  • 「土構造物の品質」における圧密・変形予測

    飯塚敦

    基礎工 特集:圧密沈下の予測・対策の現状,総説   34 ( 6 )   8 - 11   2006.6

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  • 欧州における性能設計を支える制度に関する調査報告 土木学会地盤工学委員会,土構造の性能評価に関する小委員会

    飯塚敦,他

    関連報告:土木学会地盤工学委員会,土構造の性能評価に関する小委員会・WG(1):盛土構造物の性能規定化における課題と展望,委員会報告,土木学会論文集C,土木学会   Vol.63 ( No.4 )   993 - 1000   2006.4

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  • 地盤工学における技術者教育の意義と学会の役割,総説

    飯塚 敦

    地盤工学会誌「土と基礎」   Vol.54 ( No.1,Ser.No.576 )   1 - 4   2006.1

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  • 新しい地圏環境を探る、環境・安全・情報

    三田地 利之, 飯塚 敦, 川口 貴之, 本多 眞, 金子 治

    土と基礎   Vol.53 ( No.12 )   21 - 24   2005.12

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  • 地盤動態解析の基礎理論

    大野進太郎, 竹山智英, 飯塚敦, Pipatpongsa Thirapong, 太田秀樹

    21世紀COEプログラム「都市地震工学の発展と体系化」   96 ( No. )   35 - 46   2005

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  • Technical session 1b: Laboratory testing(II): Strength, Large deformation and hydraulic properties

    Ohta,H, Alonso,E, Iizuka,A, Kuwano,R

    Proceeding of the 16th International Conference on Soil Mechanics and Geotechnical Engineering   3145 - 3147   2005

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  • 総括,ディスカッションセッション18 土構造物の品質評価 -技術的アプローチを探るⅡ

    前川 太, 飯塚 敦

    第39回地盤工学研究発表会特集号 土と基礎   Vol.52 ( No.12,Ser.No.563 )   46   2004.12

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  • 第3期技術者教育委員会の取り組み, -試案プログラムの実施と国際化教育-

    飯塚敦,他4名

    土と基礎   Vol.52 ( No.12,Ser.No.563 )   115 - 118   2004.12

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  • 地盤工学における継続教育 -G-CPDシステムの活用状況と今後-,「第3期技術者教育委員会の取り組み」

    飯塚敦,他11名

    第39回地盤工学研究発表会,ディスカッションセッション2   8 - 15   2004.6

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  • 第2回アジア地域不飽和土国際会議開催報告

    飯塚 敦

    土と基礎   Vol.52 ( No.4,Ser.No.555 )   37   2004.4

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  • Technological evaluation of countermeasure works in constructing embankments on soft ground

    Takeyama Tomohide, Ohta Hideki, Inagaki Motohiro

    Proceedings of the Japan National Conference on Geotechnical Engineering   39   1325 - 1326   2004

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    DOI: 10.11512/jiban.JGS39.0.1325.0

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  • 土構造物の品質評価-技術的アプローチを探る

    飯塚 敦, 前川 太

    土と基礎 = Soil mechanics and foundation engineering   51 ( 12 )   29 - 30   2003.12

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  • 総括,ディスカッションセッション12 土構造物の品質評価-技術的アプローチを探る

    飯塚 敦, 前川 太

    第38回地盤工学研究発表会特集号,土と基礎   Vol.51 ( No.12 )   19 - 20   2003.12

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  • 地盤の変形解析の現状と将来展望,技術の現状とこれから求められるもの

    飯塚敦

    地質と調査 (通巻第97号)   ( ’03第3号 )   10 - 15   2003.11

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  • DEFORMATION ANALYSIS OF SOFT SUBSOIL ON SLOPING BEDROCK LOADED BY HIGHWAY EMBANKMENT WITH STABILIZATION METHODS

    IIZUKA ATSUSHI, YAMAMOTO NOBUTAKA, SUEOKA MASUMI, SATO NOBUO, KAWAIDA MINORU, OHTA HIDEKI

    Journal of the Japanese Geotechnical Society   43 ( 5 )   81 - 92   2003.10

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    A highway embankment built in Akita prefecture using ground stabilization methods was constructed on very soft peat and clay deposits on a sloping base. This paper presents a case study of a soil/water coupled elasto-viscoplastic finite element simulation of an actual embankment construction, that is, the deformation analysis of a soft clayey foundation deposited on an inclined base with embankment loading. For execution of the numerical simulation, determining the input parameters needed in the analysis and evaluating the shape of sloping bedrock under the ground were problems. The former is discussed for a practical procedure of determining input parameters using unconfined compression strengths and the latter is accomplished by drawing a contour map of the top face of the bedrock under the ground, with reference to the geographical features of the area around the site and to a topographic map. The performance of the numerical simulation is discussed in comparison with in-situ monitored records. The effectiveness of ground stabilization methods employed at the site is also a topic of discussion.

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    Other Link: http://dl.ndl.go.jp/info:ndljp/pid/10424030

  • 継続教育の具体案-次期委員長として,「知識社会における地盤技術者の生涯教育と学会の役割」平成13年度~平成14年度技術者教育委員会成果報告書より

    飯塚敦 編集

    第38回地盤工学研究発表会資料   2003.7

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  • NUMERICAL INTERPRETATION OF A SHAPE OF YIELD SURFACE OBTAINED FROM STRESS PROBE TESTS

    KOBAYASHI Ichizo, SOGA Kenichi, IIZUKA Atsushi, OHTA Hideki

    Journal of the Japanese Geotechnical Society   43 ( 3 )   95 - 103   2003.6

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    Experimental evidence suggests that a mutual relationship between anisotropy and structure of clays exists. It was hypothesized that development and decay of the structure of clays (called structuralizing and destructuralizing) can be regarded as development of anisotropy and decay of anisotropy (isotropization), respectively. Using this hypothesis, an anisotropic rotational hardening rule was incorporated in the Sekiguchi-Ohta elasto-plastic constitutive model. The subloading surface concept was also introduced to model the plastic deformation inside the yield surface more accurately. The proposed model provided some rational as well as physical explanations for the experimental facts. Using the proposed model, it was possible to simulate the apparent softening behavior observed in anisotropically consolidated specimens. For isotropically consolidated specimens, no softening was observed, which is consistent with the experimental data. At the critical state, the undrained shear strength of the anisotropically consolidated specimens was the same as that of the isotropically consolidated specimens. This is due to both specimens having the same soil structure after large shearing. The shape of yield surface obtained from stress probe tests was investigated by simulating the tests with the proposed model. Typical data of the stress probe tests of natural clays shows that the yield surface generally has a smooth elliptical shape. By modeling the rotation of yield surface, the proposed model was capable of simulating this 'apparent' yield surface.

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    Other Link: http://dl.ndl.go.jp/info:ndljp/pid/10423982

  • 荷重履歴の違いによる過剰間隙水圧の発生

    西田博文, 和泉大祐, 飯塚敦, 河井克之

    地盤工学研究発表会発表講演集   38th   1351 - 1352   2003.6

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  • 上・拡張下負荷面,回転硬化を導入した弾塑性構成モデルによる砂の再液状化特性の表現

    大野進太郎, 飯塚敦, 河井克之, 太田秀樹

    地盤工学研究発表会発表講演集   38th   495 - 496   2003.6

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  • 神戸アラカルト-写真で見る-,親土木入門

    飯塚 敦

    土木学会誌   Vol.88   62 - 65   2003.3

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  • ,

    Hideki Ohta, Atsushi Iizuka

    Soft Ground Engineering in Coastal Areas   397 - 407   2003

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    Hideki Ohta, Atsushi Iizuka

    Soft Ground Engineering in Coastal Areas   397 - 407   2003

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  • 地盤の弾・(粘)塑性構成式 -地盤の変形シミュレーション-

    飯塚敦

    第16回塑性加工技術フォーラム「非金属材料の塑性変形」講演集   2002.11

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  • Application of an elasto-plastic model with subloading surface to compacted soils

    Iizuka,A, Kim, E.R, Kawai,K, Hirata,M

    Proc. of 1st International Workshop on New Frontiers in Computational Geotechnics   2002.9

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  • 編集後記

    飯塚 敦

    土と基礎   Vol.49 ( No.12 )   2001.12

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  • Geotechnical education using full-scaled experiments

    Ohta,H, Iizuka,A, Kobayashi,I, Arai,K

    Task Report, TC31 of ISSMGE, Proc. of 15th International Conference on Soil Mechanics and Geotechnical Enginerring (ICSMGE)   2001.9

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  • 6.地盤の変形、講座:有限要素法の基礎と地盤工学への応用

    飯塚 敦

    土と基礎   Vol.49 ( No.8 )   31 - 36   2001.8

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  • 5.土と水の連成問題, 講座:有限要素法の基礎と地盤工学への応用

    飯塚 敦

    土と基礎   Vol.49 ( No.7 )   37 - 43   2001.7

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  • 本号の編集にあたって

    飯塚 敦

    土と基礎   Vol.49 ( No.6(巻頭言) )   2001.6

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  • 沈下・変形を予測する,特集「理論」と「経験」と地盤問題に挑む

    飯塚 敦

    土木学会誌5月号   Vol.86   16 - 18   2001.5

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  • 物理数学的にみた土質力学

    田村 武, 飯塚 敦 他20名

    「地盤工学における物理数学の応用に関する研究委員会」サマースクールテキスト   1 - 245   2000.8

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  • 地盤の変形、弾性論から見た地盤変形

    飯塚 敦

    現場技術3者のための土質工学講習会⑧テキスト   1 - 36   1999.11

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  • 土質力学のバックグラウンド

    田村武, 飯塚敦 他20名

    「地盤工学における物理数学の応用に関する研究委員会」プレ・サマースクールテキスト   1 - 151   1999.9

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  • 「現在」を知って「将来」を予測する―ジオシンセティックス補強土構造物を例にとって

    Vol.14 ( No.3 )   54 - 61   1998.11

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  • ジオシンセティックス補強土構造物の限界状態設計 Proc.A.McGownによるKeynote lectureの紹介

    飯塚 敦

    ジオシンセティックス技術情報7月号   Vol.13 ( No.2 )   27 - 30   1998.7

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  • Performance and Monitoring of Underground Works

    46 ( 3 )   26 - 26   1998.3

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  • 第14回国際地盤工学会議報告,ディスカッションセッション,4.2地下構造物の施工事例と現場計測

    飯塚 敦

    土と基礎   Vol.46 ( No.3 )   26 - 26   1998.3

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  • 構成式・有効応力解析の基礎と静的解析事例

    飯塚敦

    地盤工学会講習会,これからの数値解析テキスト   1 - 31   1998.1

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  • ベーン試験と一軸試験

    飯塚 敦

    講座 土と基礎テキスト   1998.1

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  • A note on the elasto-viscoplastic formulation, Research Report

    Iizuka,A

    Research Report, Dept. of Civil Engineering, Virginia Polytechnic Institute and State University   1 - 56   1996.8

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  • 同一教官による同一講義の実験

    飯塚 敦

    土木学会誌3月号   Vol.81   32 - 35   1996.3

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  • 第29回土質工学研究発表会 総括,せん断(粘性土)

    飯塚敦

    土と基礎   Vol.42 ( No.12 )   21 - 21   1994.12

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  • 第13回 国際土質基礎工学会議報告 ディスカッションセッション 2・3地盤工学教育

    飯塚 敦

    土と基礎   Vol.42 ( No.7 )   37 - 38   1994.7

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  • Lecture note of analytical methods in geotechnical engineering

    Iizuka,A, Sugimoto,M

    AIT (Asia Institute of Technology) Library   GT32-1993   1 - 129   1993.11

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  • 有限要素法による盛土地盤の変形と安定

    飯塚 敦

    土質工学における数値解析手法とその適用テキスト   28 - 47   1993.11

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  • コロラド見聞録

    村上 章, 飯塚 敦

    土と基礎   Vol.41 ( No.9 )   55 - 56   1993

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  • 地盤の変形解析への適用―弾塑性もしくは弾粘塑性構成モデルを用いた試み

    飯塚 敦

    地盤工学における有限要素法入門講習会テキスト   21 - 72   1992.9

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  • せん断帯生成シミュレーションにおける有限要素の選択について

    飯塚 敦

    地盤の変形の局所化に関する研究委員会、土質工学会 報告   1992.3

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  • 第25回土質工学研究発表会 総括・一般報告,地盤の応力と変形

    飯塚 敦

    土と基礎   Vol.38 ( No.10 )   59 - 59   1990.10

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  • 地盤の応力と変形 (第25回土質工学研究発表会<特集>) -- (第25回土質工学研究発表会総括および一般報告)

    松井 保, 前田 恭男, 飯塚 敦, 熊本 直樹, 荒井 克彦

    土と基礎   38 ( 10 )   p57 - 60   1990.10

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  • 奨励賞を受賞して

    八嶋 厚, 飯塚 敦, 佐野 郁雄

    土と基礎   38 ( 8 )   83 - 84   1990

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  • 非共軸Cam-Clayモデルによるせん断帯の生成に関する基礎理論(『土質工学会論文報告集』Vol. 29,No.3 (1989年9月発行)掲載論文の概要)

    矢富 盟祥, 八嶋 厚, 飯塚 敦, 佐野 郁雄

    土と基礎   37 ( 9 )   142 - 143   1989

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  • 非共軸Cam-Clayモデルによるせん断帯生成の数値シミュレーション(『土質工学会論文報告集』Vol. 29,No.4 (1989年12月発行)掲載論文の概要)

    矢富 盟祥, 八嶋 厚, 飯塚 敦, 佐野 郁雄

    土と基礎   37 ( 12 )   148 - 148   1989

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  • 非共軸Cam-clay有限変形弾塑性論によるせん断帯の生成

    矢富盟祥, 八嶋厚, 飯塚敦, 佐野郁雄

    第36期第5回塑性工学部門委員会, 材料学会   1 - 30   1988.11

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  • DACSAR (Deformation Analysis Considering Stress-induced Anisotropy and Reorientation) Soil/water coupled F.E. program and its manual

    Ohta,H, Iizuka,A

    Research Report of Construction Laboratory, Dept. of Civil Engineering, Kyoto University   1 - 36   1987.10

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  • 弾・粘塑性有限要素解析における入力パラメーターの決定手順(『土質工学会論文報告集』Vol. 27,No. 3)

    飯塚 敦, 太田 秀樹

    土と基礎   35 ( 9 )   101 - 101   1987

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Presentations

  • 地盤グリッドモデルを用いた数値解析モデルの自動生成

    田村彩奈, 本田和也, 竹山智英, 橘伸也, 飯塚敦

    第56回地盤工学研究発表会(山形,オンライン)  2021.7 

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  • 動的解析を用いたアーチ効果の液状化への影響評価

    林啓太, 竹山智英, 橘伸也, 飯塚敦

    第56回地盤工学研究発表会(山形,オンライン)  2021.7 

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  • 過圧密比の深度分布と地表面加速度の相関性

    林勇佑, 本田和也, 竹山智英, 橘伸也, 飯塚敦

    2021年度土木学会関西支部年次学術講演会(オンライン)  2021.5 

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  • 飽和ベントナイト供試体の吸水による側方膨潤シミュレーション

    入江弘樹, 伊藤真司, 橘伸也, 飯塚敦

    令和2年度土木学会全国大会(講演概要集 CS12-18)  2020.9 

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  • 不飽和ベントナイト供試体の吸水膨潤による隙間充填過程シミュレーション

    太田有祐, 伊藤真司, 浅妻大樹, 橘伸也, 飯塚敦, 林大介, 石井智子

    第55回地盤工学研究発表会(オンライン)21-2-3-05  2020.7 

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  • せん断強度から不飽和土の圧縮・硬化特性を類推する方法の提案

    有井拓也, 林啓太, 橘伸也, 飯塚敦

    第55回地盤工学研究発表会(オンライン)23-1-4-08  2020.7 

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  • ベントナイト緩衝材を対象とした不飽和弾塑性構成モデルとパラメータ推定手法の提案

    伊藤真司, 橘伸也, 飯塚敦

    第55回地盤工学研究発表会(オンライン)23-7-3-08  2020.7 

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  • 盛土の遠心模型実験に対する動的数値シミュレーション

    山本百華, 加藤知彦, 竹山智英, 飯塚敦

    第55回地盤工学研究発表会(オンライン)22-7-2-08  2020.7 

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  • 液状化後の地盤沈下現象に着目した都市全体解析に関する研究~千葉県浦安市における測量結果との比較検討~

    末光明信, 佐藤毅, 飯塚敦, 竹山智英

    第55回地盤工学研究発表会(オンライン)21-11-4-07  2020.7 

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  • 液状化後の地盤沈下現象に着目した都市全体解析に関する研究~解析パラメータの同定~

    末光明信, 佐藤毅, 飯塚敦, 竹山智英

    第55回地盤工学研究発表会(オンライン)21-11-4-06  2020.7 

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  • 粘性曲面モデルを用いた二次圧密における層厚~載荷時間関係の表現

    平田昌史, 太田秀樹, 飯塚敦

    第55回地盤工学研究発表会(オンライン)21-10-1-07  2020.7 

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  • 土水連成問題における分離型解法における反復試行の収束時のパラメータの推定

    吉村侑起, 飯塚敦, 竹山智英, 北野井智希, 長浦崇晃

    第 54 回地盤工学研究発表会  ( さいたま市 )   2019.7  地盤工学会

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  • ベントナイト緩衝材を対象とする不飽和弾塑性構成モデルの再現性評価

    太田有祐, 松尾颯大, 伊藤真司, 橘伸也, 飯塚 敦

    第 54 回地盤工学研究発表会  ( さいたま市 )   2019.7  地盤工学会

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  • 隙間充填過程を経たベントナイト緩衝材の変状シミュレーション

    橘伸也, 伊藤真司, 田中芳典, 飯塚敦, 石井智子, 今井政孝

    第 54 回地盤工学研究発表会  ( さいたま市 )   2019.7  地盤工学会

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  • ベントナイト緩衝材の膨潤圧発生機構についての解析的検討

    伊藤真司, 橘伸也, 飯塚敦

    第 54 回地盤工学研究発表会  ( さいたま市 )   2019.7  地盤工学会

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  • 不飽和土弾塑性構成モデルパラメータの同定法とその検証

    林啓太, 松本昌祥, 伊藤真司, 橘伸也, 飯塚敦

    第 54 回地盤工学研究発表会  ( さいたま市 )   2019.7  地盤工学会

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  • Influence of Geometry and Soil Parameters in the Modelling of Embankment on Soft Soil Foundation

    伊藤肇, William Cheang, 太田秀樹, 飯塚敦

    2019.7 

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  • 東京海抜ゼロメートル地帯における液状化解析

    本田和也, 大山和貴, 竹山智英, 橘伸也, 飯塚敦

    第 54 回地盤工学研究発表会  ( さいたま市 )   2019.7  地盤工学会

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  • 分離型解法を用いた土/水連成問題の検討

    北野井智希, 竹山智英, 飯塚敦, 橘伸也

    第53回地盤工学研究発表会 (pp.1737-1738)  ( 高松市 )   2018.7  地盤工学会

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  • 不飽和土の弾塑性構成モデルにおける硬化則に関するパラメータの推定手法

    松本 昌祥, 豊香都樹, 橘伸也, 飯塚敦, 佐藤毅

    第53回地盤工学研究発表会 (pp.699-700)  ( 高松市 )   2018.7  地盤工学会

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  • 東京海抜ゼロメートル地帯における地下水位変動に伴う液状化リスク

    本田和也, 竹山智英, 橘伸也, 飯塚敦

    第53回地盤工学研究発表会 (pp.1879-1880)  ( 高松市 )   2018.7  地盤工学会

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  • 地層処分における再冠水から超長期変質過程の力学−水理−化学連成解析

    酒井城, 伊藤真司, 橘伸也, 飯塚敦, 林大介, 高沢真由美, 小林一三

    第53回地盤工学研究発表会 (pp.741-742)  ( 高松市 )   2018.7  地盤工学会

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  • Nonlinearity and Uncertainty of Geotechnical Finite Element Analysis

    Hajime ITO, William Cheang, Hideki OHTA, Atsushi IIZUKA

    ( 高松市 )   2018.7  地盤工学会

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  • Bjerrumの仮説に基づいた年代効果による疑似過圧密粘性土の圧密降伏応力の試算

    齋藤禎二郎, 飯塚敦, 北村晃寿, 太田秀樹

    第53回地盤工学研究発表会 (pp.757-758)  ( 高松氏 )   2018.7  地盤工学会

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  • 除荷過程における地盤材料の塑性軟化特性を考慮した弾塑性構成モデルの提案

    伊藤 真司, 橘 伸也, 飯塚 敦

    第53回地盤工学研究発表会(pp.365-366)  ( 高松市 )   2018.7  地盤工学会

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  • 海底地盤の原位置強度推定方法に関する解析的検討

    杉山 友理, 飯塚 敦

    第53回地盤工学研究発表会 (pp.211-212)  ( 高松市 )   2018.7  地盤工学会

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  • デコルマ帯における変質を考慮したせん断シミュレーション

    前川慎太郎, 麻生勇人, 飯塚敦, 橘伸也, 竹山智英, 杉山友里

    第53回地盤工学研究発表会(pp.345-346)  ( 高松市 )   2018.7  地盤工学会

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  • Elastoplastic prediction of clay-buffer homogenization due to swelling behavior International conference

    Tachibana, S, Ito, S, Sakai, J, Iizuka, A, Ishii, T, Kawakubo, M, Kobayashi, I

    7th International Conference on Clays in Natural and Engineered Barriers for Radioactive Waste Confinement  ( Davos, Switzerland )   2017.9 

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  • ベイズ推定を用いた被害予測における死亡者数再現関数の検討

    本田 和也, 橘 伸也, 飯塚 敦

    第52 回地盤工学研究発表会(T – 06 pp.61-62)  ( 名古屋市 )   2017.7  地盤工学会

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  • 溶存気体の気化が真空圧密時の地盤内圧力変化に及ぼす影響

    杉山 友理, 長浦 崇晃, 竹山 智英, 飯塚 敦

    第52 回地盤工学研究発表会 (E – 02 pp.757-758)  ( 名古屋市 )   2017.7  地盤工学会

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  • 様々な応力条件におけるB 値測定手法の繰返し載荷の影響

    上原 拓真, 宇治 亮佑, 杉山 友理, 橘 伸也, 飯塚 敦

    第52 回地盤工学研究発表会 (D – 07 pp.591-592)  ( 名古屋市 )   2017.7  地盤工学会

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  • 密度差のある二つの締固めベントナイト供試体の直列膨潤圧試験シミュレーション

    酒井 城, 伊藤 真司, 橘 伸也, 飯塚 敦, 石井 智子, 小林 一三

    第52 回地盤工学研究発表会 (D – 05 pp.2055-2056)  ( 名古屋市 )   2017.7  地盤工学会

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  • 不飽和地盤の液状化強度発現に関する解析的研究

    長浦 崇晃, 杉山 友理, 竹山 智英, 飯塚 敦

    第52 回地盤工学研究発表会 (E – 00 pp.1621-1622)  ( 名古屋市 )   2017.7  地盤工学会

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  • 不確かさを考慮した地盤解析結果の評価法

    伊藤 肇, 太田 秀樹, 飯塚 敦

    第52 回地盤工学研究発表会(E – 02 pp.783-784)  ( 名古屋市 )   2017.7  地盤工学会

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  • 地盤動的解析のための試験結果のばらつきを考慮したパラメータ範囲の検討

    嶋田倫昌, 飯塚敦, 竹山智英, 鹿瀬一希

    第52 回地盤工学研究発表会 (E – 07 pp.1541-1542)  ( 名古屋市 )   2017.7  地盤工学会

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  • 先行効果を考慮した弾・粘塑性構成モデルの動的解析への適用

    田中 直人, 竹山 智英, 飯塚 敦, 田中 麻穂, 平田 昌史

    第52 回地盤工学研究発表会(E – 13 pp.1579-1580)  ( 名古屋市 )   2017.7  地盤工学会

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  • 深海底地盤からのサンプリング試料のモデル化に関する考察

    田窪 尭, 岡田真理子, 杉山友理, 橘 伸也, 飯塚 敦

    第52 回地盤工学研究発表会 (E – 02 pp.587-588)  ( 名古屋市 )   2017.7  地盤工学会

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  • 三成分系状態図による締固め土の強度評価

    松本 昌祥, 橘 伸也, 飯塚 敦

    第52 回地盤工学研究発表会 (E – 02 pp.583-584)  ( 名古屋市 )   2017.7  地盤工学会

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  • 化学変質によるベントナイト緩衝材の超長期挙動に及ぼす初期密度分布の影響

    伊藤 真司, 神藤 卓哉, 橘 伸也, 飯塚 敦, 林 大介, 小林 一三, 高沢 真由美

    第52 回地盤工学研究発表会 (E – 02 pp.2069-2070)  ( 名古屋市 )   2017.7  地盤工学会

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  • デコルマ帯におけるせん断破壊モデル

    麻生 勇人, 妹川 賢司, 杉山 友理, 橘 伸也, 飯塚 敦

    第52 回地盤工学研究発表会 (E – 02 pp.655-656)  ( 名古屋市 )   2017.7  地盤工学会

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  • デコルマ帯におけるスロースリップの弾塑性論的解釈

    小松 美樹, 杉山 友理, 橘 伸也, 飯塚 敦

    第52 回地盤工学研究発表会 (E – 00 pp.303-304)  ( 名古屋市 )   2017.7  地盤工学会

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  • ジオテキスタイルを用いた補強土の補強効果の評価手法

    飯塚 敦, 織田 裕至, 橘 伸也

    第52 回地盤工学研究発表会 (K – 14 pp.489-490)  ( 名古屋市 )   2017.7  地盤工学会

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  • SPH 法を用いた仮置き盛土に対する安全性検討

    上野山裕己, 竹山 智英, 飯塚 敦

    第52 回地盤工学研究発表会 (E – 13 pp.1805-1806)  ( 名古屋市 )   2017.7  地盤工学会

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  • Research activities at RWMC on the bentonite re-saturation process (2) Laboratory and numerical evaluation

    Ito, S, Tachibana, S, Sakai, J, Iizuka, A, Kobayashi, I. Ishii, T, Kawakubo, M

    BEACON Initial Workshop  2017.6 

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  • 放射性廃棄物地層処分におけるベントナイト緩衝材の変質評価

    伊藤 真司, 飯塚 敦, 橘 伸也

    第51回地盤工学研究発表会 (CD-ROM0365 pp.729-730)  ( 岡山市 )   2016.9  地盤工学会

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  • 粘性曲面モデルを用いた構造の発達・劣化の表現

    平田 昌史, 飯塚 敦, 太田 秀樹

    第51回地盤工学研究発表会 (CD-ROM0188 pp.375-376)  ( 岡山市 )   2016.9  地盤工学会

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  • 間隙保水特性と非可逆変形特性が B 値発現に及ぼす影響

    宇治亮佑, 杉山友理, 田中博之, 河井克之, 竹山智英, 飯塚敦

    第51回地盤工学研究発表会 (CD-ROM0347 pp.693-694)  ( 岡山市 )   2016.9  地盤工学会

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  • 海底地盤から採取したサンプリング試料の強度発現メカニズム

    杉山 友理, 中谷 奈央, 竹山 智英, 飯塚 敦

    第51回地盤工学研究発表会 (CD-ROM0346 pp.691-692)  ( 岡山市 )   2016.9  地盤工学会

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  • ベイズ推定を用いた被害予測モデルと災害対応におけるタイムライン分析

    本田 和也, 小谷 稔, 飯塚 敦

    第51回地盤工学研究発表会 (CD-ROM0059 pp.117-118)  ( 岡山市 )   2016.9  地盤工学会

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  • デコルマ帯における固着メカニズムの解明

    麻生 勇人, 飯塚 敦, 竹山 智英, 杉山 友理, 佐々木 陽亮

    第51回地盤工学研究発表会 (CD-ROM0369 pp.737-738)  ( 岡山市 )   2016.9  地盤工学会

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  • ジオテキスタイル補強土構造物における補強効果の検討

    織田 裕至, 川勝 拓哉, 飯塚 敦, 竹山 智英

    第51回地盤工学研究発表会 (CD-ROM0786 pp.1571-1572)  ( 岡山市 )   2016.9  地盤工学会

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  • TC106 Unsaturated soils における世界的な動向

    飯塚 敦

    51回地盤工学研究発表会 (CD-ROM0035 pp.69-70)  ( 岡山市 )   2016.9  地盤工学会

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  • 高レベル放射性廃棄物の地層処分における緩衝材の再冠水挙動に関する解析的検討

    吉野 修, 石山 宏二, 金澤 伸一, 飯塚 敦

    平成28年度土木学会全国大会,第71回年次学術講演会 (CS13-039 pp.77-78)  ( 仙台市 )   2016.9  土木学会

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  • ワイブル分布を用いた災害死亡者数のベイズ推定モデル

    小谷 稔, 飯塚 敦, 河井 克之

    日本災害情報学会第17回研究発表大会  ( 甲府 )   2015.10 

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  • 応力履歴がB 値発現に及ぼす影響(実験)

    玉井三友紀, 杉山友理, 田中博之, 河井克之, 飯塚敦

    第50回地盤工学研究発表会 (D-00 pp.693-694)  ( 札幌 )   2015.9  地盤工学会

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  • 応力履歴がB 値発現に及ぼす影響(解析)

    田中博之, 杉山友理, 河井克之, 飯塚敦, 玉井三友紀

    第50回地盤工学研究発表会(E-00 pp.695-696)  ( 札幌 )   2015.9  地盤工学会

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  • Albany硅砂の弾塑陸構成パラメータの同定

    吉富力, 河井克之, 飯塚敦, Lohani, Tara Nidhi

    第50回地盤工学研究発表会(E-02 pp.447-448)  ( 札幌 )   2015.9  地盤工学会

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  • 粒度分布に注目した土粒子吸着物質の除去法の検討

    西門優, 飯塚敦, 河井克之

    第50回地盤工学研究発表会 (T-14 pp.2295-2296)  ( 札幌 )   2015.9  地盤工学会

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  • 覆土工における排水能力の評価

    岡田真理子, 生田勇輝, 飯塚敦, 河井克之, 坂尾亮太, 小原義之

    第50回地盤工学研究発表会 (E-07 pp.63-64)  ( 札幌 )   2015.9  地盤工学会

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  • 複数種の補強繊維を使用した軽量セラミックスの強度特性について

    横江勇, 河野純子, 宮崎健次朗, 金尾茂樹, 飯塚敦

    平成27年度土木学会全国大会,第70回年次学術講演会 (Ⅴ-302)  ( 岡山 )   2015.9  土木学会

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  • 非線形コントラクタンシー表現式を用いた弾塑性構成モデルの破壊規準の改良

    京川裕之, 大野進太郎, 飯塚敦

    第50回地盤工学研究発表会 (D-06 pp.365-366)  ( 札幌 )   2015.9  地盤工学会

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  • 地層処分における緩衝材の再冠水挙動に関する解析的検討

    吉野 修, 石山 宏二, 金澤 伸一, 飯塚 敦

    平成27年度土木学会全国大会,第70回年次学術講演会 (CS12-031)  ( 岡山 )   2015.9  土木学会

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  • 地層処分におけるベントナイト緩衝材の変質挙動評価

    神藤 卓哉, 樋野 隆太, 飯塚 敦, 河井 克之

    第50回地盤工学研究発表会 (H-11 pp.2375-2376)  ( 札幌 )   2015.9  地盤工学会

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  • 深海底デコルマ帯の変質を考慮したせん断破壊モデル

    戎 健次, 杉山 友理, 佐々木 陽亮, 飯塚 敦, 河井 克之

    第50回地盤工学研究発表会 (B-06 pp.369-370)  ( 札幌 )   2015.9  地盤工学会

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  • 降雨時の傾斜地盤内における空気圧の挙動について

    川勝 拓哉, 大川 紀郁, 河井 克之, 飯塚 敦

    第50回地盤工学研究発表会 (E-07 pp.2101-2102)  ( 札幌 )   2015.9  地盤工学会

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  • 気相の影響を考慮した河川堤防の外水位変動シミュレーション

    織田 裕至, 川勝 拓哉, 河井 克之, 飯塚 敦

    第50回地盤工学研究発表会 (H-07 pp.1069-1070)  ( 札幌 )   2015.9  地盤工学会

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  • 関口・太田による弾・粘塑性構成モデルにおける応力緩和項の定式化について

    平田 昌史, 飯塚 敦, 太田 秀樹

    第50回地盤工学研究発表会 (E-13 pp.399-400)  ( 札幌 )   2015.9  地盤工学会

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  • 海底地盤からのサンプリングに伴う応力変化が強度特性に及ぼす影響

    中谷 奈央, 杉山 友理, 飯塚 敦, 河井 克之

    第50回地盤工学研究発表会 (E-00 pp.711-712)  ( 札幌 )   2015.9  地盤工学会

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  • ワイブル分布による被災者数のベイズ推定

    小谷 稔, 飯塚 敦, 河井 克之

    平成27年度土木学会全国大会,第70回年次学術講演会 (Ⅳ-043)  ( 岡山 )   2015.9  土木学会

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  • ベンダーエレメントを用いた不飽和供試体のせん断弾性定数

    妹川 賢司, 吉富 力, 飯塚 敦, 河井 克之, Lohani Tara Nidhi

    第50回地盤工学研究発表会 (D-00 pp.735-736)  ( 札幌 )   2015.9  地盤工学会

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  • スメクタイトの変質作用がデコルマ帯におけるせん断特性に及ぼす影響

    佐々木陽亮, 杉山友理, 戎健次, 飯塚敦, 河井克之

    第50回地盤工学研究発表会(B-06 pp.371-372)  ( 札幌 )   2015.9  地盤工学会

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  • ベイズ推定を用いた災害時の被災者数予測

    小谷稔, 飯塚敦, 河井克之

    日本災害情報学会第16回研究発表大会  ( 長岡 )   2014.10 

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  • 廃砂たい積場の覆土設置による沈下の評価

    佐々木陽亮, 飯塚敦, 高山裕介, 河井克之, 生田勇輝, 坂尾亮太, 瀧富弘

    第69回土木学会年次学術講演会(Ⅲ-364 pp.727-728)  ( 大阪 )   2014.9  土木学会

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  • 土の粒度分布に注目した放射性物質吸着土壌の減容化に関する検討

    吉井 大貴, 飯塚 敦, 河井 克之, 西門 優

    第69回土木学会年次学術講演会(CS9-010 pp.19-20)  ( 大阪 )   2014.9  土木学会

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  • 液相への間隙空気溶解を考慮した室内要素試験シミュレーション

    田中博之, 杉山友里, 河井克之, 飯塚敦

    第49回地盤工学研究発表会 (講演概要集DVD/352 pp.703-704)  ( 北九州 )   2014.7  地盤工学会

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  • 土/水/空気有限要素解析を用いた河川堤防における浸潤面の形成メカニズムの再現(1)

    戎健次, 坂本諭, 河井克之, 飯塚敦

    第49回地盤工学研究発表会 (講演概要集DVD/348 pp.695-696)  ( 北九州 )   2014.7  地盤工学会

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  • 土/水/空気連成有限要素解析を用いた河川堤防における浸潤面の形成メカニズムの再現(2)

    坂本諭, 戎健次, 河井克之, 飯塚敦

    第49回地盤工学研究発表会(講演概要集DVD/347 pp.693-694)  ( 北九州 )   2014.7  地盤工学会

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  • 長期化学的変質を考慮したベントナイト緩衝材の力学モデルと境界値問題の定式化

    鶴見修平, 森本晃樹, 高山祐介, 生田勇輝, 飯塚敦, 河井克之

    第49回地盤工学研究発表会(講演概要集DVD/1052 pp.2103-2104)  ( 北九州 )   2014.7  地盤工学会

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  • 東名牧の原崩壊盛土の原位置強度推定の試み

    太田秀樹, 齋藤邦夫, 横田聖哉, 藤岡一頼, 阿部文彦, 林雄介, 木村勝, 渡邉真一, 石垣勉, 飯塚 敦

    第49回地盤工学研究発表会 (講演概要集DVD/503 pp.1005-1006)  ( 北九州 )   2014.7  地盤工学会

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  • 土/水/空気連成モデルによる降雨浸透解析

    中谷 奈央, 河井 克之, 飯塚 敦, Viradeth Phommachanh

    第49回地盤工学研究発表会 (講演概要集DVD/447 pp.893-894)  ( 北九州 )   2014.7  地盤工学会

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  • 降雨浸透シミュレーションにおける浸透能の影響について

    川勝 拓哉, 家永 康平, Viradeth Pommachanh, 飯塚 敦, 河井 克之

    第49回地盤工学研究発表会(講演概要集DVD/448 pp.895-896)  ( 北九州 )   2014.7  地盤工学会

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  • 化学変質を考慮したベントナイト緩衝材の力学モデル

    森本 晃樹, 高山 裕介, 鶴見 修平, 飯塚 敦, 河井 克之, 大和田 仁

    第49回地盤工学研究発表会(講演概要集DVD/1051 pp.2101-2102)  ( 北九州 )   2014.7  地盤工学会

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  • タイ東北部における塩害抑制手法の検討

    田中 琢, 杉山 友理, 飯塚 敦, 河井 克之, 野村 瞬

    第49回地盤工学研究発表会 (講演概要集DVD/445 pp.889-890)  ( 北九州 )   2014.7  地盤工学会

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  • 長期的化学変質作用を考慮するためのベントナイト緩衝材の力学モデル化

    高山裕介, 鶴見修平, 飯塚敦, 河井克之, 小林一三, 大和田仁

    第68回土木学会年次学術講演会(CS部門 pp.41-42)  ( 東京 )   2013.9  土木学会

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  • 廃砂たい積場の覆土設置による沈下及び覆土の排水機能の評価

    生田勇輝, 高山裕介, 鶴見修平, 市川康明, 飯塚敦, 河井克之, 瀧富弘, 坂尾亮太

    第68回土木学会年次学術講演会(III部門 pp.377-378)  ( 東京 )   2013.9  土木学会

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  • ベントナイト材料の実験結果から得た構成モデルを用いた各種室内試験の解析

    前田圭介, 飯塚敦, 河井克之, 高山裕介

    第68回土木学会年次学術講演会 (CS部門 pp.59-60)  ( 東京 )   2013.9  土木学会

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  • 土質力学から見たベントナイト材料の特異性と構成モデル化

    高山裕介, 前田圭介, 飯塚敦, 河井克之, 小林一三

    第68回土木学会年次学術講演会 ( CS部門 pp.57-58)  ( 東京 )   2013.9  土木学会

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  • 土壌種類に起因する塩類の移動性の違い

    杉山 友理, 野村 瞬, 飯塚 敦, 河井 克之

    第68回土木学会年次学術講演会 (III部門 pp.373-374)  ( 東京 )   2013.9  土木学会

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  • 粒度分布を考慮した土粒子のイオン吸着試験

    西門 優, 吉井 大貴, 河井 克之, 飯塚 敦

    第 48 回地盤工学研究発表会 (講演概要集DVD pp.2159-2160 )  ( 富山 )   2013.7  地盤工学会

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  • 二次圧密による擬似過圧密化を考慮した弾・粘塑性構成モデル

    平田 昌史, 飯塚 敦, 太田 秀樹

    第 48 回地盤工学研究発表会 (講演概要集DVD pp.1001-1002)  ( 富山 )   2013.7  地盤工学会

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  • 東名牧の原崩壊盛土材料の締固め-定体積単純せん断強度特性

    木村勝, 石垣勉, 横田聖也, 藤岡一頼, 阿部文彦, 飯塚敦, 齋藤邦夫, 太田秀樹

    第 48 回地盤工学研究発表会 (講演概要集DVD pp.481-482)  ( 富山 )   2013.7  地盤工学会

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  • 土/水連成有限要素法を用いた降雨時斜面安定に関する各種要因の検討

    松尾直人, 家永康平, PhommachanhViradeth, 河井克之, 飯塚敦

    第 48 回地盤工学研究発表会 (講演概要集DVD pp.1959-1960)  ( 富山 )   2013.7  地盤工学会

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  • 数値計算による異なる含水比で締固め度の等しい締固め地盤の品質評価

    佐藤 武斗, Phommachanh Viradeth, 河井克之, 飯塚敦

    第 48 回地盤工学研究発表会 (講演概要集DVD pp.391-392)  ( 富山 )   2013.7  地盤工学会

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  • 構造物に近接する埋立て工事に対するロバスト制御アプローチの適用

    綿地 規文, 田中 琢, 佐藤 毅, 飯塚 敦, 河井 克之

    第 48 回地盤工学研究発表会 (講演概要集DVD pp.229-230)  ( 富山 )   2013.7  地盤工学会

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  • 過圧密粘土の三軸繰返しせん断による変形強度特性の変化

    吉富 力, 安原 昇平, 河井 克之, 飯塚 敦

    第 48 回地盤工学研究発表会 (講演概要集DVD pp.465-466)  ( 富山 )   2013.7  地盤工学会

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  • 東日本大震災の津波による地盤塩害及び土壌汚染調査・分析

    杉山友理, 野村瞬, 飯塚敦, 河井克之, 橘伸也, 金澤伸一, 竹山智英

    第62回理論応用力学講演会(NCTAM2013),OS20-01  ( 東京都 )   2013.3 

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  • 東日本大震災における津波由来土壌汚染調査

    杉山友理, 野村瞬, 飯塚敦, 河井克之, 橘伸也, 金澤伸一, 竹山智英

    第67回土木学会年次学術講演会 (III部門 pp.131-132)  2012.9  土木学会

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  • Weight transmission in conical sand pits stored in a rectangular bin, The 47th Japan National Conference on Geotechnical Engineering

    Tang, L, Thay, S, Pipatpongsa, T, Iizuka, A

    第47回地盤工学研究発表会 (pp.636-364)  2012.7 

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  • 神戸空港島の経年沈下解析

    荒金延明, 宮本郁美, 飯塚敦, 河井克之

    第47回地盤工学研究発表会 (pp.745-746)  ( 八戸 )   2012.7  地盤工学会

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  • 沈降海浜部地盤内の塩分移動予測及び一本松保護

    杉山友理, 河井克之, 野村瞬, 飯塚敦

    第47回地盤工学研究発表会 (pp.37-38)  ( 八戸 )   2012.7  地盤工学会

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  • 土/水/空気連成有限要素解析プログラムによる締固め施工を考慮した築堤シミュレーション

    Phommachanh,V, 河井克之, 佐藤武斗, 飯塚敦

    第47回地盤工学研究発表会 (pp.21-22)  ( 八戸 )   2012.7  地盤工学会

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  • 締固めシミュレーションに及ぼす土質物性の影響

    坂本諭, Phommachanh Viradeth, 河井克之, 飯塚敦

    第47回地盤工学研究発表会(pp.23-24)  ( 八戸 )   2012.7  地盤工学会

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  • 東日本大震災の津波による地盤塩害の調査・分析

    野村瞬, 河井克之, 杉山友理, 飯塚敦

    第47回地盤工学研究発表会 (pp.1957-1958)  ( 八戸 )   2012.7  地盤工学会

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  • TRU廃棄物処分場における緩衝材の力学・化学連成解析

    鶴見修平, 飯塚敦, 高山裕介, 河井克之

    第47回地盤工学研究発表会 (pp.1945-1946)  ( 八戸 )   2012.7  地盤工学会

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  • 土/水/空気連成有限要素解析プログラムを用いた「締固め」の力学的説明

    柴田昌輝, 大槻剛瑠, 後藤浩司, 河井克之, 飯塚敦

    第46回地盤工学研究発表会 (講演集 pp.697-698)  ( 神戸 )   2011.7  地盤工学会

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  • 弾塑性構成理論に基づくベントナイトの吸水膨潤特性の表現

    高山裕介, 前田圭介, 飯塚敦, 河井克之, 大野進太郎, 橘伸也, 金澤伸一

    第46回地盤工学研究発表会 (講演集 pp.685-686)  ( 神戸 )   2011.7  地盤工学会

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  • 荷重載荷による飽和/不飽和地盤内溶解物質の移動表現

    野村瞬, 角井駿祐, 河井克之, 橘伸也, 金澤伸一, 飯塚敦

    第46回地盤工学研究発表会 (講演集 pp.1009-1010)  ( 神戸 )   2011.7  地盤工学会

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  • Saline soil problems in the northeastern part of Thailand and development of a computing tool for inter-organization collaboration

    T. Pipatpongsa, K. Kawai, A. Iizuka

    2010.12 

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  • 下負荷面・上負荷面を考慮した関口・太田モデルの特異点処理法

    平田昌史, ピパットポンサー・ティラポン, 飯塚敦, 太田秀樹

    第45回地盤工学研究発表会 (講演集 pp.231-232)  ( 愛媛 )   2010.8  地盤工学会

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  • 土/水連成有限要素解析プログラムを用いた締固め土の品質の検討

    尾崎 早希子, 柴田 昌輝, 河井 克之, 金澤 伸一, 飯塚 敦

    第45回地盤工学研究発表  ( 松山 )   2010.8  地盤工学会

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  • 土/水/空気連成有限要素解析による締固めシミュレーション

    山田 竜太郎, 金澤 伸一, 河井 克之, 飯塚 敦

    第45回地盤工学研究発表会  ( 松山 )   2010.8  地盤工学会

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  • 地下水位変動による地盤挙動の解釈

    島本 恵梨子, 籠橋 慶太, 飯塚 敦, 河井 克之

    第45回地盤工学研究発表会  ( 松山 )   2010.8  地盤工学会

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  • 下負荷面を用いた不飽和土における降伏面内の弾塑性挙動のモデル化

    Phommachanh Viradeth, 河井 克之, 金澤 伸一, 飯塚 敦

    第45回地盤工学研究発表会  ( 松山 )   2010.8  地盤工学会

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  • 斜面形状による築堤時の発現応力の違い

    田中麻穂, 河井克之, 金澤伸一, 橘伸也, 大野進太郎, 飯塚敦

    第64回土木学会年次学術講演会 (議講演概要集 III部門 pp.669-670)  ( 福岡 )   2009.9  土木学会

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  • 不飽和土弾塑性構成モデルを用いた築堤シミュレーション

    田中麻穂, 河井克之, 金澤伸一, 橘伸也, 大野進太郎, 飯塚敦

    第44回地盤工学研究発表会 (講演集 pp.973-974)  ( 横浜 )   2009.8  地盤工学会

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  • 多孔質セラミック粒状体の一次元圧縮特性と破砕性

    河津次郎, 河井克之, 金澤伸一, 飯塚敦

    第44回地盤工学研究発表会 (講演集 pp.481-482)  ( 横浜 )   2009.8  地盤工学会

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  • 気候条件に伴う塩害の被害及び対策

    野村瞬, 河井克之, 大野進太郎, Thirapong Pipatpongsa, 橘伸也, 金澤伸一, 飯塚敦

    第44回地盤工学研究発表会 (講演集 pp.913-914)  ( 横浜 )   2009.8  地盤工学会

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  • 土/水連成有限要素解析プログラムを用いた締固め曲線の表現

    柴田昌輝, 河井克之, 金澤伸一, 橘伸也, 大野進太郎, 飯塚敦, 本田道識

    第44回地盤工学研究発表会(講演集 pp.655-656)  ( 博多 )   2009.7  地盤工学会

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  • Analyses of pressure distribution under 2D sand heap by considering arching effect「アーチ効果を考慮した二次元砂山底面での圧力分布解析」

    Pipatpongsa,T. Heng, S. Ohta,H, Iizuka,A

    第58回理論応用力学講演会 NCTAM2009 (講演論文集 pp.391-392)  2009.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Statics of a sand heap under gravity associates to stress indeterminacy. The additional relationship is usually given by constitutive relations. Thus, radial stress field function satisfying plane equilibrium, constitutive relation and stress initial-boundary condition can provide a basic solution. Since stress distribution in sand heap is also depended on stress history during formation, therefore it is difficult to specify the constitutive relation which can characterize this complicated problem. The recent researches has linked arching criterion to describe a local constitutive relation and successfully captured a phenomenon of vertical pressure dip. However, a clear degree of arching effect to a stress distribution beneath the base of the heap has not been clarified. This study investigated the influence of arch shapes formed in sand heap and found particular patterns which are acceptably agreed with the experimental data. Therefore, arch formed during formation could be considered as stress memories of sand heap.

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  • 陰解応力積分法を導入した地盤構成式の検討

    金澤伸一, T. Pipatpongsa, 竹山智英, 橘伸也, 飯塚敦

    第5回地盤工学会関東支部発表会「Geo-Kanto 2008」(pp.350-355)  2008.11  地盤工学会

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  • 1次元圧密解析による盛土の沈下計算-現場実測データならびに2次元土・水連成解析とくらべて-

    太田秀樹, 竹山智英, 尤龍涛, 石垣勉, 飯塚敦

    第5回地盤工学会関東支部発表会 (発表講演集 地盤工学会 pp.40-45)  2008.10  地盤工学会

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  • 破砕によるコントラクタンシー特性変化を考慮した岩石材料の弾塑性構成モデル

    佐伯拓也, 橘伸也, 飯塚敦

    第63回年次学術講演会 (講演概要集 III部門 pp.483-484)  2008.9  土木学会

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  • 施工速度の違いが盛土基礎地盤の変形に与える影響

    鈴木 佑介, 竹山 智英, 飯塚 敦

    第63回年次学術講演会 (講演概要 III部門 pp.627-628)  2008.9  土木学会

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  • 汚泥焼成土の基礎力学特性

    渡瀬梓, Djoko S Agung, 河井克之, 飯塚敦, 橘伸也, 金澤伸一

    第63回年次学術講演会(講演概要集 III部門 pp.901-902)  ( 仙台 )   2008.9  土木学会

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  • 密な豊浦砂の降伏面と塑性ひずみ方向についての実験的検討

    大川広, 桑野二郎, 飯塚敦, 日下部治, 太田秀樹

    第43回地盤工学研究発表会 (講演概要集 pp.399-400 CD-ROM)  2008.7  地盤工学会

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  • 軟弱地盤上の道路盛土における性能指標の検討

    石垣 勉, 飯塚 敦, 太田 英樹

    第43回地盤工学研究発表会 (講演概要集 pp.1113-1114 CD-ROM)  2008.7  地盤工学会

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  • 静止土圧係数の解析

    ピパットポンサー ティラポン, 大野進太郎, 飯塚敦, 太田秀樹

    第43回地盤工学研究発表会(講演概要集 pp.265-266 CD-ROM)  2008.7  地盤工学会

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  • 関口・太田モデルの特異点における負荷判定法

    平田昌史, 竹山智英, Pipatpongsa Thirapong, 飯塚敦, 太田秀樹

    第43回地盤工学研究発表会(講演概要集 pp.289-290 CD-ROM)  2008.7  地盤工学会

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  • 植生の吸水作用が地盤の変形に及ぼす影響

    山田竜太郎, 河井克之, 飯塚敦, 橘伸也, 金澤伸一

    第43回地盤工学研究発表会 (講演概要集 pp.2155-2156 CD-ROM)  ( 広島 )   2008.7  地盤工学会

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  • 土/水連成有限要素解析を用いた各種外的要因による地盤内水分布変化

    寺島裕樹, 河井克之, 飯塚敦, 橘伸也, 金澤伸一

    第43回地盤工学研究発表会(講演概要集 pp.715-716 CD-ROM)  2008.7  地盤工学会

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  • Domain of metastability at the corner of the Sekiguchi-Ohta model

    T. Pipatpongsa, T. Takeyama, H. Ohta, A. Iizuka

    理論応用力学講演会 (講演論文集 pp.355-356)  2008.6 

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    Metastable domain of strain rate enclosed at the corner of the Sekiguchi-Ohta model is formulated in principal strain space. It was confirmed that this domain is bounded by elliptical curve in pi plane. The proposed referenced basis is useful to represent state of stress on regular yield surface and strain increment in metastable domain. Centroid of the domain is referred to the at-rest state under Ko condition.

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  • オリジナル・カムクレイと修正カムクレイの比較―故きを温ね,新しきを知る-

    太田秀樹, 飯塚敦, ティラポン ピパットポンサー, 竹山智英

    第4回地盤工学会関東支部発表会 (発表講演集 pp.455-460)  2007.10  地盤工学会

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  • 弾塑性構成モデルのMetastability 特性とその定量化

    竹山 智英, 大野 進太郎, ピパットポンサー ティラポン, 飯塚 敦, 太田 秀樹

    第42回地盤工学研究発表会 (講演概要集 pp.263-264 CD-ROM)  2007.7  地盤工学会

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  • 盛土を載荷した軟弱地盤の力学挙動に対するClass A 予測

    倉本匠, 太田秀樹, 飯塚敦, 大野進太郎, 竹山智英

    第42回地盤工学研究発表会 (講演概要集 pp.253-254 CD-ROM)  2007.7  地盤工学会

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  • 関口・太田モデルにおける陽解積分法を用いた応力更新アルゴリズム(Substepping schemes for the numerical integration of the Sekiguchi-Ohta model)

    ピパットポンサー・ティラポン, 竹山智英, 大野進太郎, 飯塚敦, 太田秀樹

    第42回地盤工学研究発表会 (講演概要集 pp.265-266 CD-ROM)  2007.7  地盤工学会

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  • 関口・太田による弾粘塑性構成モデルにおける負荷判定の改良

    大野進太郎, 竹山智英, 飯塚敦, ピパットポンサー, ティラポン, 太田秀樹

    第42回地盤工学研究発表会 (講演概要集 pp.261-262 CD-ROM)  2007.7  地盤工学会

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  • ダイレタンシー特性の表現の異なる弾塑性構成モデルに対するせん断帯生成解析

    橘 伸也, 大野 進太郎, 飯塚 敦, 太田 秀樹

    第42回地盤工学研究発表会 (講演概要集 pp.227-228 CD-ROM)  2007.7  地盤工学会

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  • 締固め曲線と圧縮曲線の関連性について

    本田 道識, 大野 進太郎, 飯塚 敦, 河井 克之, 太田 秀樹

    第42回地盤工学研究発表会 (講演概要集 地盤工学会 CD-ROM)  ( 名古屋 )   2007.7  地盤工学会

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  • 地球環境問題の階層的整理と砂漠化問題の位置付け

    杉田芙紗子, 飯塚敦, 河井克之, PIPATPONGSA Thirapong

    第42回地盤工学研究発表会(講演概要集 pp.1-2 CD-ROM)  ( 名古屋 )   2007.7  地盤工学会

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  • 数値シミュレーションによる地圏・気圏間水循環に影響を及ぼす地下ダムの影響検討

    大昇弘樹, 飯塚敦, 河井克之

    平成19年度土木学会関西支部年次学術講演会(講演概要集 第3部門 CD-ROM)  2007.5  土木学会関西支部

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  • 境界端面の潤滑性に注目した粘土供試体のせん断シミュレーション

    三好絵里子, 橘伸也, 飯塚敦, 河井克之

    平成19年度土木学会関西支部年次学術講演会(講演概要集 第3部門 CD-ROM)  2007.5  土木学会関西支部

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  • 異方圧密粘土を想定した弾塑性構成モデルの破壊条件とKo条件の理論式;Geo-Kanto 2006

    太田秀樹, 大野進太郎, 飯塚敦, ピパットポンサー・ティラポン, 竹山智英

    第3回地盤工学会関東支部研究発表会 (発表講演集 地盤工学会 pp.309-312)  2006.11  地盤工学会

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  • 関口・太田による弾・粘塑性モデルにおける応力緩和項へのマクローリン展開の適用

    飯塚 敦, 竹山 智英, 大野 進太郎, ピパットポンサー ティラポン, 太田 秀樹

    第41回地盤工学研究発表会 (講演概要集 pp.315-316 CD-ROM)  2006.7  地盤工学会

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  • 拡張下負荷面を導入した弾塑性構成モデルの陰解積分アルゴリズム

    大野 進太郎, 青木 孝憲, 飯塚 敦, 太田 秀樹, ピパットポンサー ティラポン

    第41回地盤工学研究発表会 (講演概要集 pp.317-318 CD-ROM)  2006.7  地盤工学会

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  • 陰解積分アルゴリズムの境界値問題への適用性の検討

    青木 孝憲, 大野 進太郎, 太田 秀樹, 飯塚 敦, ピパットポンサー ティラポン

    第41回地盤工学研究発表会 (講演概要集 pp.319-320 CD-ROM)  2006.7  地盤工学会

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  • 一次関数近似を用いた水頭の空間離散化

    竹山 智英, 飯塚 敦, 太田 秀樹

    第41回地盤工学研究発表会 (講演概要集 pp.321-322 CD-ROM)  2006.7  地盤工学会

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  • 上負荷面を用いた締固め粘性土の排気非排水せん断挙動の表現方法

    古村隆博, 大野進太郎, 本田道識, 飯塚敦, 河井克之, 太田秀樹

    第41回地盤工学研究発表会(講演概要集 pp.849-850 CD-ROM)  ( 鹿児島 )   2006.7  地盤工学会

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  • 上負荷面を用いた締固め粘性土の等体積せん断挙動の表現方法

    本田道識, 大野進太郎, 古村隆博, 飯塚敦, 河井克之, 太田秀樹

    第41回地盤工学研究発表会(講演概要集 pp.847-848 CD-ROM)  ( 鹿児島 )   2006.7  地盤工学会

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  • 共生への国際技術協力の可能性 タイ東北部における塩害調査

    A Iizuka

    第10回震災技術展,神戸会場,「安全・安心」への国際協力の現状と課題  ( 神戸 )   2006.1  神戸市防災安全公社

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  • 締固め土の体積圧縮挙動に着目した応力ひずみ関係の定式化

    本田道識, 飯塚敦, 大野進太郎, 河井克之, 汪偉川

    第60回年次学術講演会 (講演概要集 III部門 pp.247-248 CD-ROM)  ( 東京 )   2005.9  土木学会

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  • 締固め土の圧縮特性に関する評価方法

    本田 道識, 飯塚 敦, 大野 進太郎, 河井 克之, 汪 偉川

    第40回地盤工学研究発表会 (講演集 pp.899-900)  ( 函館 )   2005.7  地盤工学会

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  • 植生による蒸発散量を考慮した不飽和地盤の変形挙動予測

    汪 偉川, 小羽根 憲司, 飯塚 敦, 河井 克之

    第40回地盤工学研究発表会 (講演集 pp.941-942)  ( 函館 )   2005.7  地盤工学会

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  • 関口・太田モデルの圧密特性と粘塑性パラメータ

    西田 博文, 飯塚 敦, 河井 克之, 太田 秀樹

    第40回地盤工学研究発表会 (講演集 pp.983-984)  ( 函館 )   2005.7  地盤工学会

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  • 下負荷面を導入した弾塑性構成モデルの陰解積分アルゴリズム

    OHNO Shintaro, IIZUKA Atsushi, OHTA Hideki, ピパットポンサー ティラポン

    第40回地盤工学研究発表会講演集  2005.7 

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  • 陰解法アルゴリズムに基づく有限変形弾塑性有限要素解析

    Tachibana S, IIZUKA A, OHTA Hideki

    第40回地盤工学研究発表会講演集  2005.7 

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  • 陰解積分法を用いた関口・太田による弾・粘塑性モデルに対する応力更新アルゴリズム

    竹山智英, 大野進太郎, ピパットポンサー・ティラポン, 飯塚敦, 太田秀樹

    第40回地盤工学研究発表会 (講演集,pp.573-574)  ( 函館 )   2005.7  地盤工学会

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  • SCP工法を伴う防波堤の長期的品質予測

    和泉 大祐, 西田 博文, 飯塚 敦

    第40回地盤工学研究発表会 (講演集 pp.1099-1100)  ( 函館 )   2005.7  地盤工学会

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  • Influence of ground improvement on the quality of man-made islands International conference

    A Iizuka, H Nishida, K Kawai

    11th International Association for Computer Methods and Advances in Geomechanics  ( プラハ )   2005.6 

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  • 不飽和地盤への降雨のモデル化

    杉田芙紗子, WANG Weichuan, 飯塚敦, 河井克之

    土木学会関西支部年次学術講演会講演概要集(CD-ROM)  2005.5 

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  • 実験土槽における降雨浸透特性

    須谷元保, 飯塚敦, 河井克之, WANG Weichuan

    土木学会関西支部年次学術講演会講演概要集(CD-ROM)  2005.5 

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  • 蒸発散に伴う地盤の応答

    汪 偉川, 河井 克之, 飯塚 敦

    植生学会第9回大会  2004.10  植生学会

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  • 不飽和地盤―気圏間の水収支における植生の影響

    飯塚 敦

    平成16年度京都大学防災研究所研究集会(一般)「流体―不飽和土系ダイナミクスの最近の進歩と環境防災への適用」  2004.9 

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  • 不飽和地盤に及ぼす植物の吸水作用の影響

    霜永 勝之, 岸本 康照, 汪 偉川, 河井 克之, 飯塚 敦

    第59回年次学術講演会 (概要集 III部門 pp.103-104 CD-ROM3-052)  2004.9  土木学会

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  • 正規圧密年度の瞬間せん断剛性の軸圧縮履歴依存性

    高木 智哉, 岸本 鉄太郎, 飯塚 敦, 河井 克之, 橘 伸也

    第59回年次学術講演会 (概要集 III部門 pp.551-552 CD-ROM3-276)  2004.9  土木学会

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  • 初期値境界値問題における地表面水理境界による降雨表現の検討

    桜井 健一, 藤川 和彦, 汪 偉川, 河井 克之, 飯塚 敦

    第59回年次学術講演会 (概要集 III部門 pp.655-656)  2004.9  土木学会

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  • 降雨に伴う土槽内の飽和度サクション分布の変化

    藤川 和彦, 汪 偉川, 桜井 健一, 河井 克之, 飯塚 敦

    第59回年次学術講演会 (概要集 III部門 pp.651-652)  2004.9  土木学会

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  • 対数ひずみを用いた有限変形Cam-clayモデルの陰解法アルゴリズム

    橘 伸也, 飯塚 敦, 太田 秀樹

    第39回地盤工学研究発表会 (講演集 pp.259-260)  2004.7  地盤工学会

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  • 関口・太田モデルにおける塑性論的粘塑性論に基づく負荷判定法の適用性

    西田 博文, 飯塚 敦, 太田 秀樹

    第39回地盤工学研究発表会 (講演集 pp.913-914)  2004.7  地盤工学会

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  • 適用性の高いダイレイタンシーの表現式の提案とそれを用いた土の弾塑性構成式の導出

    大野進太郎, 飯塚敦, 太田秀樹

    第39回地盤工学研究発表会 (講演集 pp.261-262)  2004.7  地盤工学会

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  • 盛土構造物の建設における軟弱地盤対策工の工学的評価

    稲垣太浩, 飯塚敦, 竹山智英, 太田秀樹

    第39回地盤工学研究発表会講演論文集  2004 

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  • Mises規準から見た境界非排水粘土供試体の破壊シミュレーション -Mises型かMohr-Coulomb型か-

    橘 伸也, 飯塚 敦, 河井 克之, 太田 秀樹

    第38回地盤工学研究発表会 (講演集 CD-ROM147 pp.293-294)  2003.7  地盤工学会

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  • 地盤改良時期および位置が残留沈下に及ぼす影響

    和泉 大祐, 西田 博文, 飯塚 敦, 河井 克之

    第38回地盤工学研究発表会 (講演集 CD-ROM677 pp.1353-1354)  2003.7  地盤工学会

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    道路盛土および人工島などに挙げられる土構造物が供用後の不同沈下等により要求される性能(要求性能)が低下する事例がよく見られる.このため,初期投資だけでなく維持補修時に要するコストを含めたライフサイクルコストの低減できるような技術システムを構築が求められている.本報告はサンドドレーンによる地盤改良時期・場所の違いにより埋立地がどのように長期的に変状するかを二次元土/水連成弾・粘塑性有限要素解析により検討したものである.

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  • 谷地形盛土の不同沈下シミュレーション

    早川 英司, 霜永 勝之, 小羽根 憲司, 河井 克之, 飯塚 敦

    第38回地盤工学研究発表会 (講演集 CD-ROM456 pp.911-912)  2003.7  地盤工学会

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    近年、谷地形に大規模な盛土を行った土構造物が多く見られるが、長期の雨水浸透により盛土の品質が劣化し、盛土表面に不同沈下が生じてしまうという事例が報告されている。締固め土のような不飽和土は水浸させることにより,水浸沈下(コラプス)が生じることがわかっている。長期にわたり降雨が繰り返されることにより地盤内に局所的で短時間の水浸状態が繰り返し発生していると考えられ、盛土内に局所的な変形が生じることで不同沈下が生じていると考えられる。そこで仮想の谷地形盛土を想定し、不飽和土/水連成有限要素解析によって、水浸沈下による盛土の不同沈下を表現した。

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  • 上・拡張下負荷面,回転硬化を導入した弾塑性構成式による砂の再液状化特性の表現

    大野 進太郎, 飯塚 敦, 河井 克之, 太田 秀樹

    第38回地盤工学研究発表会 (講演集,地盤工学会,CD-ROM248 pp.495-496)  2003.7  地盤工学会

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    砂の再液状化特性は、その内部構造と密接に関わっていると考えられている。本研究では、この砂の再液状化特性を数値解析により表すことを目的としている。本研究では、砂の粒子配列を応力の異方性(降伏面の傾き)と考える。さらに、砂の嵩高な構造を考慮するために、上負荷面の概念を導入する。また、繰返し載荷への適用性を考慮し、拡張下負荷面、回転硬化を弾塑性構成式に導入する。応力振幅一定繰返し非排水せん断シミュレーションを通して、本弾塑性構成モデルの再液状化現象への適用性を検討した。結果として、砂の内部構造を、応力の異方性と上負荷面としてモデル化することの妥当性を示すことができた。

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  • 荷重履歴の違いよる過剰間隙水圧の発生

    西田 博文, 和泉 大祐, 飯塚 敦, 河井 克之

    第38回地盤工学研究発表会 (講演集 CD-ROM676 pp.1351-1352)  2003.7  地盤工学会

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    従来,道路盛土および人工島などに挙げられる土構造物の設計は,施工(荷重)履歴の違いが与える構造物自身あるいは基礎地盤の品質の影響を考慮するには至らなかった.これに対し,最近では多次元土/水連成弾(粘)塑性有限要素解析のアプローチから,荷重履歴の違いにより土構造物の品質が異なることが報告されている.本報告では簡単な地盤モデルを想定し,二次元土/水連成弾・粘塑性有限要素解析を用いて荷重履歴の違いがもたらす過剰間隙水圧の発生形態に重点を置き,土構造物の設計において考慮すべき事項について再認識を行った.

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  • FEM for the Sekiguchi-Ohta Model considering non-smooth yield surface

    Yuttapongtada, Y, Pipatpongsa, T, Iizuka, A, Ohta, H

    2003.7 

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    The FEM program for stress-deformation analysis considering non-smooth yield surface of constitutive model was developed. The consideration and handling for the singular point on non-smooth yield surface of the Sekiguchi-Ohta model was carried out based on Koiter&prime;s associated flow rule. The extra implementation for solving the difficulty at the singular point is added to FEM program called DACSAR (without any modification to the whole procedure). The numerical results from this program with and without the extra implementation was compared.

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  • Consistent tangential tensor in regard to rate-independent Sekiguchi-Ohta model

    Pipatpongsa, T. Iizuka, A, Kobayashi, I, Ohta, H

    2003.7 

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    A hypothesis of associated flow has been generally applied to elastoplastic constitutive equations for determining irreversible plastic flow emerged in an outward normal direction to yield loci. However, some of plasticity models possess intersection corners, leading to the difficulty to determine plastic flow. This paper concerned the implementation to accommodate the problem encountered to Mohr-Coulomb model using evolution of flow rule extended by Koiter (1953, 1960) and the general approach advocated in Simo, Kennedy and Govindjee (1988). Consequently, the incremental plastic strain and stress vectors can be evaluated.

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  • 地盤材料の構造の劣化と異方化/等方化を考慮した弾塑性構成モデルの開発

    小坂部 和也, 小林 一三, 飯塚 敦, 大野 進太郎, 鈴木 章浩, 太田 秀樹

    第38回地盤工学研究発表会 (講演集 CD-ROM142 pp.283-284)  2003.7  地盤工学会

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  • Mises規準から見た境界非排水粘土供試体の破壊シミュレーション―Mises規準かMohr‐Coulomb規準か―

    橘伸也, 飯塚敦, 河井克之, 太田秀樹

    地盤工学研究発表会発表講演集  2003.6 

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  • 回転硬化を導入した下負荷面関口・太田モデルによるKo値の算出

    鈴木章浩, 小林一三, 太田秀樹, 飯塚敦, 曽我健一

    第37回地盤工学研究発表会 (講演集 CD-ROM164 pp.325-326)  2002.7  地盤工学会

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  • 互層地盤からなる土留め掘削の変形に対する2次元FEM解析の適用例

    森建二, 吉田次男, 飯塚敦, 前川太

    第37回地盤工学研究発表会 (講演集 CD-ROM512 pp.1017-1018)  2002.7  地盤工学会

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  • Stress Probe Testから得られる降伏曲面の解析的解釈

    小林一三, 鈴木章浩, 飯塚敦, 太田秀樹, 曽我健一

    第37回地盤工学研究発表会(講演集 CD-ROM165 pp.327-328)  2002.7  地盤工学会

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  • Application of Dilatancy Models with Subloading Surface to Soils Reinforced by Geosynthetics

    Kim,Eun-ra, Iizuka,A, Hirata,M, Kawai,K

    2002.7 

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  • 土/水連成弾塑性動的有限要素解析手法の開発

    大野 進太郎, 飯塚 敦, 河井 克之, 橘 伸也

    第37回地盤工学研究発表会 (講演集 CD-ROM947 pp.1885-1886)  2002.7  地盤工学会

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  • 施工過程の違いによる人工島の品質への影響

    西田 博文, 井内 崇也, 飯塚 敦, 河井 克之

    第37回地盤工学研究発表会 (講演集 CD-ROM484 pp.961-962)  2002.7  地盤工学会

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  • 関口・太田モデルに適用する陰解法応力更新アルゴリズム

    ピッパットポンサー・ティラポン, 小坂部和也, 飯塚敦, 小林一三, 太田秀樹

    第37回地盤工学研究発表会 (講演集 CD-ROM167 pp.331-332)  2002.7  地盤工学会

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  • せん断に伴う応力-塑性ひずみ増分の非共軸性

    辰巳 雅俊, 高木 智哉, 飯塚 敦, 河井 克之

    第37回地盤工学研究発表会(講演集 CD-ROM125 pp.247-248)  2002.7  地盤工学会

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  • Interpretation of Koiter's associated flow rule to the corner of the Sekiguchi-Ohta model

    2002.7 

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  • Consistent tangential moduli for rate-independent Sekiguchi-Ohta model

    2002.7 

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  • 異方性地盤材料の構成モデルの陰解法有限要素解析への適用

    Pipapongsa,T, 小林一三, 太田秀樹, 飯塚敦

    第51回理論応用力学講演会 (講演論文集(NCTAM2002)pp.211-212)  2002.1  JSPS日本学術振興会メカニクス・構造研究連絡委員会

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  • 締固め土における圧密降伏応力の推定

    金 銀羅, 河井 克之, 飯塚 敦, 谷内 世依子

    第57回土木学会年次学術講演会(講演概要集 III部門 pp.703-704)  2002  土木学会

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  • The vertex singularity in the Sekiguchi-Ohta model

    2001.10 

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  • 補強工法盛土における弾・塑性解析の適用性

    森建二, 吉田次男, 飯塚敦, 前川太, 天野真輔

    第36回地盤工学研究発表会 (講演集 pp.2073-2074)  2001.6  地盤工学会

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  • 関口・太田モデルによる有効内部摩擦角とK0値の関係

    PipatpongsaThirapong, 太田秀樹, 小林一三, 飯塚敦

    第36回地盤工学研究発表会 (発表講演集 pp.937-938)  2001.6  地盤工学会

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  • 塑性ポテンシャル関数の尖り点における関連流則の処理

    Pipapongsa,T, 太田秀樹, 小林一三, 飯塚敦

    第36回地盤工学研究発表会(講演集 pp.935-936)  2001.6  地盤工学会

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  • 中央遮水壁型ロックフィルダムの築堤および湛水シミュレーション

    吉牟田竜太, 本田道識, 早川英司, 河井克之, 飯塚敦

    第36回地盤工学研究発表会 (講演集 pp.897-898)  2001  地盤工学会

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  • 関口・太田による弾塑性構成モデルへの下負荷面の導入

    橘 伸也, 大野 進太郎, 飯塚 敦, 小林 一三

    平成13年度土木学会関西支部年次学術講演会 III-25  2001  土木学会関西支部

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  • 仮想ロックフィルダムの築堤・湛水シミュレーション

    早川 英司, 吉牟田 竜太, 本田 道識, 河井 克之, 飯塚 敦

    平成13年度土木学会関西支部年次学術講演会 III-20  2001  土木学会関西支部

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  • 有限要素法を用いた掘削工事における周辺地盤変形の影響範囲の検証

    小島 謙一, 飯塚 敦, 太田 秀樹, 舘山 勝

    第55回年次学術講演会 (講演概要集 III部門-B184 pp.366-367)  2000.9  土木学会

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  • ジオシンセティックスによる補強効果と有限要素シミュレーション

    鈴木宏一郎, 平田昌史, 飯塚敦, 太田秀樹

    第55回年次学術講演会 (講演概要集 III部門-B309 pp.616-617)  2000.9  土木学会

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  • 締固め土の圧縮特性に及ぼす供試体作成条件の影響

    瀬口均, 本田道識, 河井克之, 飯塚敦, 軽部大蔵

    第35回地盤工学研究発表会 (講演集 pp.1283-1284)  2000.6  地盤工学会

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 掘削工事の現場計測データに基づく周辺地盤変形の影響範囲の予測

    小島謙一, 飯塚敦, 太田秀樹, 館山勝

    第35回地盤工学研究発表会 (講演集 pp.1337-1338)  2000.6  地盤工学会

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    Event date: 2000.6    

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ジオシンセティックス補強土遠心実験の有限要素解析

    大野 進太郎, 飯塚 敦, 軽部 大蔵

    平成12年度土木学会関西支部年次学術講演会(講演概要集 pp.III-69-1-III-69-2)  2000.6  土木学会関西支部

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    Event date: 2000.6    

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  • 間隙水分布を考慮した不飽和土の土/水連成解析

    西田博文, 本田道識, 飯塚敦, 軽部大蔵

    第34回地盤工学研究発表会 (講演集 pp.749-750)  1999.7  地盤工学会

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    Event date: 1999.7    

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  • 不飽和土の応力~ひずみ関係の定式化

    本田道識, 軽部大蔵, 飯塚敦, 河井克之

    第34回地盤工学研究発表会 (講演集 pp.747-748)  1999.7  地盤工学会

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    Event date: 1999.7    

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  • 塑性論的粘塑性論による関口・太田モデルの解釈

    飯塚敦, 太田秀樹

    第34回地盤工学研究発表会 (講演集 pp.595-596)  1999.7  地盤工学会

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    Event date: 1999.7    

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  • 柴山潟干拓地における道路盛土施工沈下予測

    刈田 裕亮, 飯塚 敦, 軽部 大蔵, 金子 智之

    第34回地盤工学研究発表会 (講演集 pp.1073-1074 )  1999.7  地盤工学会

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    Event date: 1999.7    

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  • ジオシンセティックスによる拘束効果―有限要素シミュレーション―

    平田昌史, 野室明久, 太田秀樹, 横田善弘, 飯塚敦

    第34回地盤工学研究発表会 (講演集 pp.791-792)  1999.7  地盤工学会

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    Event date: 1999.7    

    Language:Japanese   Presentation type:Oral presentation (general)