A computational periporomechanics model for localized failure in unsaturated porous media
A computational periporomechanics model for localized failure in unsaturated porous media
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DOI：
10.1016/j.cma.2021.113932
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发表时间：
2020-10
期刊：
影响因子：
--
通讯作者：
Shashank Menon;Xiaoyu Song
中科院分区：
文献类型：
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作者：
Shashank Menon;Xiaoyu Song
本文提出了一个考虑被动大气压力的非饱和多孔介质局部破坏的塑性周孔力学计算模型。计算围孔力学模型的基础上制定的假设，即非饱和多孔介质可以表示为一个集合的两相材料点与无穷小体积相互作用在有限的距离。固体骨架变形的有效力状态概念和非饱和流体流动的周向状态概念被用于具有内在长度尺度的耦合积分-微分场方程。非饱和流体的流动状态和有效力状态分别由流体势态和固体骨架的变形状态决定。围孔力学模型采用隐式两阶段无网格方法进行数值计算，并采用消息传递接口技术进行并行计算。通过模拟经典的耦合孔隙力学问题，并将数值结果与解析解和实验数据进行比较，验证了数值实现的有效性。在不同的情况下进行的数值例子来证明的鲁棒性的实施计算围孔力学模型模拟局部破坏的非饱和多孔介质作为耦合固体变形和非饱和流体流动问题。
This article is devoted to a computational plastic periporomechanics model for localized failure in unsaturated porous media assuming passive atmospheric pressure. The computational periporomechanics model is formulated based on the hypothesis that unsaturated porous media can be represented by a collection of two-phase material points with infinitesimal volumes interacting with each other within finite distance. The effective force state concept for solid skeleton deformation and the peridynamic state concept for unsaturated fluid flow are utilized in the coupled integro-differential field equations that have an intrinsic length scale. The unsaturated fluid flow state and effective force state are determined by the fluid potential state and the deformation state of the solid skeleton, respectively. The periporomechanics model is numerically implemented by an implicit two-phase meshfree method in which the message passing interface technique is used for parallel computing. The numerical implementation is validated by simulating classical coupled poromechanics problems and comparing numerical results with analytical solutions and experimental data. Numerical examples under different scenarios are conducted to demonstrate the robustness of the implemented computational periporomechanics model for simulating localized failure in unsaturated porous media as a coupled solid deformation and unsaturated fluid flow problem.