分野 1-a　粘土

• A gradient dependent viscoplastic model for clay
  F.Oka, A.Yashima, T.Adachi and E.C.Aifantis
  Proc. 3rd Int. Conf. Constitutive Laws for Engineering Materials
  C.S.Desai et al., ASME Press pp. 313-316, 1991
  
  
• Gradient dependent viscoplastic model for clay and numerical experiments by FEM
  F.Oka, A.Yashima, T.Adachi and E.C.Aifantis
  Proc. 6th Int. Conf. Mechanical Behaviour of Materials
  M.Jono and T.Inoue, Kyoto, Pergamon Press, pp. 203-208, 1991
  
  
• Cyclic plasticity models for geomaterials based on non-linear kinematic hardening theory
  A. Yashima, F.Oka and M.Kato
  Proc. Int. Sympo. Pre-failure Deformation Characteristics of Geomaterials
  S.Shibuya et al., Sapporo, Vol.1, Balkema, pp. 469-475, 1994
  
  
• A cyclic elasto-viscoplastic model for cohesive soil
  F.Oka and A.Yashima
  Proc. 11th European Regional Conf. SMFE, Florence, Vol.6, pp. 6.145-6.150, 1995
  
  
• On the effect of kinematic hardening rule in a three dimensional consolidation
  F.Oka, A.Yashima, K.Sawada and K.Ono
  Proc. Int. Sympo. Compression and Consolidation of Clayey Soils
  H.Yoshikuni and O.Kusakabe, Hiroshima, Vol.1, Balkema, pp. 355-360, 1995
  
  
• Application of Laval type large diameter sampler to soft clay in Japan
  F.Oka, A.Yashima, T.Hashimoto and M.Amemiya
  Soils and Foundations, Vol.36, No.3, pp. 99-111, 1996
  
  
• Sampling of soft soils in Japan
  H.Tanaka, F.Oka and A.Yashima
  Marine Georesources and Geotechnology, Vol.14, pp. 283-295, 1996
  
  
• Effect of internal structure on mechanical behavior of Osaka Pleistocene marine clay
  A. Yashima, F.Oka and H.Shigematsu
  Proc. 7th Int. Offshore and Polar Eng. Conf.
  J.S.Chung et al., Honolulu, Vol.1, Balkema, pp. 933-938, 1997
  
  
• An elasto-thermo-viscoplastic model for natural clay and its application
  F.Oka, A.Yashima and S.Leroueil
  Proc. 6th Int. Sympo. Num. Models in Geomech.
  S.Pietruszczak and G.N.Pande, Montreal, Balkema, pp. 105-110, 1997
  
  
• Modelling temperature and strain rate dependent behavior of clays: One dimensional consolidation
  A.Yashima, S.Leroueil, F.Oka and I.Guntoro
  Proc. Soils and Foundations, pp. 63-73, 1998
  
  
• 大口径ラバル型サンドサンプラ−の開発と適用
  岡　二三生, 八嶋　厚, 三村　衛, 橋本　正, 坂上敏彦, 市原浩司
  土と基礎, 第46巻, 第5号, pp. 19-21, 1998
  
  
• Effect of internal structure as related to geotechnical properties of Osaka Pleistocene clay
  A.Yashima, H.Shigematsu, and F.Oka
  Proc. Int. Sympo. on Problematic Soils
  E.Yanagisawa et al., Sendai, pp. 571-574, 1998
  
  
• Stress-strain characteristics of Osaka Pleistocene clay
  F.Oka, A.Yashima and H.Shigematsu
  Proc. 8th KKNN Seminar on Civil Engr., Singapore, pp. 434-439, 1998
  
  
• 上部大阪洪積粘土の力学特性と構造変化
  八嶋　厚，重松宏明，岡　二三生，長屋淳一
  土木学会論文集, No.624/�V-47, pp. 217-229, 1999