Modeling localized failure in geomaterials by large-deformation-plasticity periporomechanics

TL;DR

This paper introduces a novel large-deformation-plasticity periporomechanics framework to model localized failure in geomaterials, effectively capturing shear bands and slope failures under large deformations.

Contribution

It develops a nonlocal periporomechanics model incorporating large deformation plasticity and implements it with a meshfree numerical method for geomechanical failure analysis.

Findings

Successfully models shear banding in porous media.

Demonstrates robustness in simulating retrogressive slope failure.

Validates the new paradigm's effectiveness for large deformation problems.

Abstract

Large-deformation localized failure in geomaterials plays a crucial role in geohazards engineering. This article investigates shear bands and retrogressive failure of geomaterials through a recently formulated large-deformation-plasticity periporomechanics (PPM) paradigm. Periporomechanics is a nonlocal reformulation of classical poromechanics through the effective force and peridynamic state concepts. The nonlocal deformation gradient is multiplicatively decomposed into the elastic and plastic parts in this large-deformation PPM paradigm. The stabilized correspondence principle is adopted to implement a classical elastoplastic constitutive model into the new PPM paradigm. We have numerically implemented this large-deformation plasticity PPM paradigm through a Lagrangian meshfree method in space and an explicit Newmark scheme in time. The implemented PPM framework is used to model shear banding and retrogressive slope failure in porous media under dry conditions. The numerical results have demonstrated the efficacy and robustness of this new PPM paradigm for modeling shear banding and retrogressive failure involving large deformation in porous media.