Elasto-Viscoplastic constitutive model for natural clay and its application

天然粘土弹粘塑性本构模型及其应用

• 批准号: 01550382
• 负责人: OKA Fusao
• 金额: $ 1.28万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550382/
• 关键词: Natural Clay; Constitutive Model; Viscoplasticity; Anisotropy; Triaxial Test; Torsional Test; Yield Surface; Consolidation; 弾粘塑性構成式; 鋭敏粘土; ひずみ履歴効果; ひずみ速度効果; 乱れの影響; 繰返し試験

In order to rationally analyze the deformation of natural clay deposits, it is very important to construct constitutive model for natural clay. For this purpose, firstly we have carried out several tests for natural clay, e. g. anisotropic consolidation test, undrained compression and extension tests by use of triaxial apparatus and torsional hollow cylinder tests under undrained condition. From these results, we have found the overconsolidation boundary surface (initial yield surface) and examined the variation of viscoplastic parameters in the constitutive model. Also, rate sensitivity and softening characteristics of sheer behavior have been clarified. By the triaxial tests results for the presheared sample, the effect of disturbance for the mechanical behavior was observed.From the triaxial test results on the samples with different inclination angle between the major principle stress plane and the horizontal bedding plane, it was found that the effect of structural anisotropy on deformation behavior is more marked than the b value in the overconsolidated Eastern Osaka clay.Considering the above mentioned experimental results, we have developed an elasto-viscoplastic model for clay which can describe the cyclic behavior and anisotropic characteristics of natural clay in the overconsolidated region. And we have discussed the problem of application of the proposed model to the real boundary value problem.

为了合理地分析天然粘土的变形，建立天然粘土的本构模型是十分重要的。为此，我们首先对天然粘土进行了各向异性固结试验、三轴仪不排水压缩拉伸试验和不排水条件下的扭转空心圆筒试验。从这些结果中，我们找到了超固结边界面（初始屈服面），并研究了本构模型中粘塑性参数的变化。此外，还澄清了纯行为的速率敏感性和软化特性。通过对预剪试样的三轴试验结果，观察了扰动对试件力学性能的影响。从主应力面与水平顺层面倾角不同的三轴试验结果来看，结构各向异性对大阪东部超固结粘土变形行为的影响比b值更为显著。基于上述试验结果，我们建立了一个能够描述超固结区天然粘土循环行为和各向异性特征的粘土弹粘塑性模型。并讨论了该模型在实际边值问题中的应用问题。

项目成果

F.Oka,F.Tavenas,S.Leroueil: "A constitutive model for natural soft clay with strain softening" Soils and Foundations. 29. 54-66 (1989)

F.Oka，F.Tavenas，S.Leroueil：“具有应变软化功能的天然软粘土本构模型”土壤和基础。

F.Oka,F.Tavenas,S.Leroueil: "An elastoーviscoplastic FEM analysis of sensitive clay foundation beneath embankments" Proc. 7th Cont. on Int. Ass. for Computer Methods and Advances in Geomechanics. (1991)

F. Oka、F. Tavenas、S. Leroueil：“路堤下敏感粘土地基的弹粘塑性有限元分析”，《计算机方法与地质力学进展》第 7 期。

F. Oka, F. Tavenas, S. Leroueil: "An elasto-viscoplastic FEM analysis of sensitive clay foundation beneath embankments" Proc. 7th Conf. of the Int. Association for Computer Methods and Advances in Geomechanics. (1991)

F. Oka、F. Tavenas、S. Leroueil：“路堤下敏感粘土地基的弹粘塑性 FEM 分析”Proc。

岡二三生、足立紀尚、平田武弘、橋本正: "Triaxial and Torsional Hollow Cylinder Tests of Natural Sensitive Cloy and an Elosto-viscoplastic Constitutive Model" 第10回ヨ-ロッパ土質基礎工学会議論文集.

Fumi Oka、Norihisa Adachi、Takehiro Hirata、Tadashi Hashimoto：“天然敏感粘土的三轴和扭转空心圆柱试验和弹粘塑性本构模型”第十届欧洲土壤工程会议论文集。

T. Adachi, F. Oka, T. Hirata, T. Hashimoto T. B. S. Pradhan, J. Nagaya, M. Mimura: "Triaxial and torsional hollow cylinder tests on sensitive natural clay and an elasto-viscoplastic constitutive model" Proc. 10th European Conf. on Soil Mechanics & Foundat

T. Adachi、F. Oka、T. Hirata、T. Hashimoto T. B. S. Pradhan、J. Nagaya、M. Mimura：“敏感天然粘土和弹粘塑性本构模型的三轴和扭转空心圆柱体测试”Proc。