A micro-macro mechanical model for porous rock-like materials with a pressure-sensitive matrix

Abstract eng:
In this work, a micro-macro mechanical model is proposed to describe elastic-plastic behaviors of porous geomaterials. The studied material is considered as a porous medium composed of a solid matrix and spherical pores. The solid matrix exhibits a pressure-dependent plastic behavior which is described by an associated plastic model based on a Mises-Schleicher yield criterion. A macroscopic yield criterion is firstly presented, explicitly taking into account effects of porosity. With an appropriate plastic hardening law, the micro-mechanical model is then formulated and implemented in a finite element code. The proposed model is then applied to describe mechanical behaviors of two representative porous rocks, sandstone and chalk.

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