A constitutive framework for anisotropic sand including non-proportional loading
A constitutive framework for anisotropic sand including non-proportional loading
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DOI：
10.1680/geot.2004.54.1.41
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发表时间：
2004-02
期刊：
影响因子：
5.8
通讯作者：
X. S. Li;Y. Dafalias
中科院分区：
文献类型：
--
作者：
X. S. Li;Y. Dafalias
现有的平台模型固有的各向异性砂扩展到考虑变形引起的非比例荷载。该平台模型是在临界状态土力学的框架内，和固有的各向异性是占在e-p平面中的临界状态线和偏塑性模量函数的标量值的各向异性参数，ε。后者是定义在联合各向同性不变量的对称织物张量和适当定义的加载方向张量。平台模型可以成功模拟成比例和一些非比例加载响应，包括应力反向，但涉及显著主应力旋转的加载下的响应需要引入额外的加载机制。这种新的机制与应力比速率和塑性应变速率的分量有关，它们与应力比同轴的加载方向正交。在这方面的新奇…
An existing platform model for inherently anisotropic sands is extended to account for deformations induced by non-proportional loadings. The platform model is within the framework of critical-state soil mechanics, and the inherent anisotropy is accounted for by rendering the critical-state line in the e–p plane and the deviatoric plastic modulus functions of a scalar-valued anisotropic parameter, Ā. The latter is defined in terms of joint isotropic invariants of a symmetric fabric tensor and a properly defined loading direction tensor. Proportional and some non-proportional loading responses, including stress reversals, can be successfully simulated by the platform model, but the response under loading involving significant principal stress rotations requires the introduction of an additional loading mechanism. This new mechanism is associated with components of the stress ratio rate and plastic strain rate, which are orthogonal to a loading direction coaxial with the stress ratio. The novelty in this re...