Simulation of yielding and stress-stain behavior of shanghai soft clay
Simulation of yielding and stress-stain behavior of shanghai soft clay
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DOI：
10.1016/j.compgeo.2010.12.005
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发表时间：
2011-04-01
影响因子：
5.3
通讯作者：
Sheng, Daichao
中科院分区：
文献类型：
--
作者：
Huang, Maosong;Liu, Yanhua;Sheng, Daichao
本文采用一个简单的边界面塑性模型模拟了上海结构性软粘土的屈服和应力应变特性。对上海软土原状土样进行了一系列不排水三轴试验和各向同性和各向异性固结模式下的排水应力探针试验，研究了软土的屈服特性。粘土结构的退化建模与内部变量，允许边界面的大小衰减与累积的塑性应变。引入各向异性张量和旋转硬化定律来反映初始各向异性和各向异性的演化。结合各向同性硬化规则，旋转硬化规则和退化规律被纳入边界面公式与相关的流动规则。上海软土的各向同性和各向异性不排水三轴试验和排水应力探针试验结果验证了模型的有效性。该模型很好地反映了应力各向异性和结构损失的影响。(C)2011爱思唯尔有限公司保留所有权利。
In this paper, a simple bounding surface plasticity model is used to reproduce the yielding and stress-strain behavior of the structured soft clay found at Shanghai of China. A series of undrained triaxial tests and drained stress probe tests under isotropic and anisotropic consolidation modes were performed on undisturbed samples of Shanghai soft clay to study the yielding characteristics. The degradation of the clay structure is modeled with an internal variable that allows the size of the bounding surface to decay with accumulated plastic strain. An anisotropic tensor and rotational hardening law are introduced to reflect the initial anisotropy and the evolution of anisotropy. Combined with the isotropic hardening rule, the rotational hardening rule and the degradation law are incorporated into the bounding surface formulation with an associated flow rule. Validity of the model is verified by the undrained isotropic and anisotropic triaxial test and drained stress probe test results for Shanghai soft clay. The effects of stress anisotropy and loss of structure are well captured by the model. (C) 2011 Elsevier Ltd. All rights reserved.