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arXiv 2103.12259math.NAcs.NA
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饱和多孔介质动力分析的稳定化计算非局部孔隙力学模型

A stabilized computational nonlocal poromechanics model for dynamic analysis of saturated porous media

Shashank Menon, Xiaoyu Song

摘要:

在这篇文章中,我们制定了一个稳定的计算非局部孔隙力学模型的动力分析饱和多孔介质。作为一个新颖的,稳定化配方消除了零能量模式与原来的多相对应的本构模型在耦合非局部孔隙力学模型。两相稳定方案制定的能量方法,结合不均匀的固体变形和流体流动的基础上。在该方法中,骨架应变能和流体流动耗散能的非局部表达式与它们的局部表达式等价。采用隐式时间积分法求解稳定的耦合非局部孔隙力学模型。作为一个新的贡献,我们验证了耦合稳定化制定的数值结果与分析和有限元解决方案的一维和二维饱和多孔介质中的动力问题。饱和多孔介质中的动态应变局部化的数值例子来证明在动态载荷下的局部破坏的稳定耦合孔隙力学框架的有效性。

英文摘要:

In this article we formulate a stable computational nonlocal poromechanics model for dynamic analysis of saturated porous media. As a novelty, the stabilization formulation eliminates zero-energy modes associated with the original multiphase correspondence constitutive models in the coupled nonlocal poromechanics model. The two-phase stabilization scheme is formulated based on an energy method that incorporates inhomogeneous solid deformation and fluid flow. In this method, the nonlocal formulations of skeleton strain energy and fluid flow dissipation energy equate to their local formulations. The stable coupled nonlocal poromechanics model is solved for dynamic analysis by an implicit time integration scheme. As a new contribution, we validate the coupled stabilization formulation by comparing numerical results with analytical and finite element solutions for one-dimensional and two-dimensional dynamic problems in saturated porous media. Numerical examples of dynamic strain localization in saturated porous media are presented to demonstrate the efficacy of the stable coupled poromechanics framework for localized failure under dynamic loads.

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