Numerical simulation of earthquake-induced liquefactions considering the principal stress rotation
Numerical simulation of earthquake-induced liquefactions considering the principal stress rotation
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DOI：
10.1016/j.soildyn.2016.09.004
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发表时间：
2016-11
影响因子：
4
通讯作者：
Zhe Wang;Yunming Yang;Hai-Sui Yu;K. Muraleetharan
中科院分区：
文献类型：
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作者：
Zhe Wang;Yunming Yang;Hai-Sui Yu;K. Muraleetharan
动荷载如地震荷载会在饱和土中产生较大的主应力旋转。不改变主应力幅值的PSR可产生额外的超静孔隙水压力和塑性应变，从而加速不排水条件下的液化。本文采用考虑PSR影响的全耦合有限元法对一个离心模型试验进行了数值模拟。考虑地震荷载作用下PSR的影响，使用弹塑性土模型的基础上发展的运动硬化土模型与边界面的概念。土模型通过独立处理产生PSR的应力率来考虑PSR。通过数值模拟与试验结果的对比，验证了该模型的有效性。这也表明PSR的影响是不可忽视的土壤液化预测。
Dynamic loadings such as earthquake loadings can generate considerable principal stress rotation (PSR) in the saturated soil. The PSR without changes of principal stress magnitudes can generate additional excess pore water pressures and plastic strains, thus accelerating liquefaction in undrained conditions. This paper simulates a centrifuge model test using the fully coupled finite element method considering the PSR. The impact of PSR under the earthquake loading is taken into account by using an elastoplastic soil model developed on the basis of a kinematic hardening soil model with the bounding surface concept. The soil model considers the PSR by treating the stress rate generating the PSR independently. The capability of this soil model is verified by comparing the numerical predictions and experimental results. It also indicates that the PSR impact can not be ignored in predictions of soil liquefaction.