Cyclic and anisotropic elasto-viscoplastic behavior of clay and constitutive model

粘土的循环和各向异性弹粘塑性行为及本构模型

• 批准号: 04650434
• 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: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650434/
• 关键词: Clay; Elastoviscoplasticity; Constitutive model; Cyclic test; Non-linear kinematical hardening rule; Multiaxial test; Torsional test; Triaxial test; 三軸試験

Natural soft clay was sampled at both Osaka and Akita by use of modified large diameter Laval sampler in which the angle of cutting edge was improved. Triaxial tests, torsional tests were performed under the undrained conditions, in addition, multiaxial tests were carried out under undrained plane strain conditions after isotropic consolidation. In the plane strain tests, it is observed that the stress path is quite different from the results for remolded clay samples. Immediate principle stress greatly varies during the deformation. In an early part of straining, b value changes in small amount and reaches about 0.5 at large strain. As for the cyclic elasto-viscoplastic constitutive model, the proposed model based on the non-linear hardening rule was discussed for the results of cyclic isotropic consolidation test. We have found that the proposed model is applicable to both cyclic shearing and cyclic isotropic compression. In the modeling, both linear and non-linear hardening are considered in order to prevent an over-ratcheting effect. In addition, an isotropic hardening rule are used with kinematical hardening rule to describe a deterioration of shear modulus.

在大阪和秋田均使用改良的大直径拉瓦尔取样器对天然软粘土进行取样，其中改进了切削刃的角度。在不排水条件下进行三轴试验、扭转试验，并在各向同性固结后在不排水平面应变条件下进行多轴试验。在平面应变测试中，观察到应力路径与重塑粘土样品的结果有很大不同。变形过程中直接主应力变化很大。在应变初期，b值变化较小，大应变时b值达到0.5左右。对于循环弹粘塑性本构模型，针对循环各向同性固结试验的结果，对基于非线性硬化规则的模型进行了讨论。我们发现所提出的模型适用于循环剪切和循环各向同性压缩。在建模中，考虑了线性和非线性硬化，以防止过度棘轮效应。此外，各向同性硬化规则与运动学硬化规则一起使用来描述剪切模量的恶化。

项目成果

Fusao Oka: "Anisotropic and pseudo-anisotropic elasto-visciplastic constitutive model for clay" Modern Approches to Plasticity. 505-526 (1993)

Fusao Oka：“粘土的各向异性和伪各向异性弹粘塑性本构模型”现代塑性方法。

Fusao Oka: "Acyclic elasto-viscoplastic constitutive model for clay based on the non-linear hardening rule" Proc.4th Int.Symp.on Numerical Models in Geomechanics,(Balkema). 105-114 (1992)

Fusao Oka：“基于非线性硬化规则的粘土非循环弹粘塑性本构模型”Proc.4th Int.Symp.on Numerical Models in Geomechanics，（Balkema）。

Fusao Oka: "An elasto-viscoplastic constitutive model for clay using a transformed stress tensor" Mechanics of Materials. 16. 47-53 (1993)

Fusao Oka：“使用变换后的应力张量的粘土弹粘塑性本构模型”材料力学。

Fusao Oka: "A cyclic elasto-viscoplastic constitutive model for clay based on the non-linear hardening rule" Proc.4th Int.Symp.on Numerical Models in Geomechanics,(Balhema). 105-114 (1992)

Fusao Oka：“基于非线性硬化规则的粘土循环弹粘塑性本构模型”Proc.4th Int.Symp.on 地质力学数值模型，（Balhema）。

Fusao Oka: "A cyclic elasto-viscoplastic constitutive model for clay based on the non-linear hardening rule" Proc.4th Int.Symp.on Numericul Models in Geomechanics. 105-114 (1992)

Fusao Oka：“基于非线性硬化规则的粘土循环弹粘塑性本构模型”Proc.4th Int.Symp.on Numericul Models in Geomechanics。