Regular Article

A micromechanical inspired model for the coupled to damage elasto-plastic behavior of geomaterials under compression

¹ Laboratoire de Mécanique des Solides, École Polytechnique, 91128 Palaiseau, France
² Institut des Sciences de la Mécanique et Applications Industrielles, UMR EDF-CNRS-CEA-ENSTA 9219, Université Paris Saclay, 91120 Palaiseau, France

^* e-mail: kyrylo.kazymyrenko@edf.fr

Received: 15 December 2017
Accepted: 13 November 2018

Abstract

We propose an elasto-plastic model coupled with damage for the behavior of geomaterials in compression. The model is based on the properties, shown in [S. Andrieux, et al., Un modèle de matériau microfissuré pour les bétons et les roches, J. Mécanique Théorique Appliquée 5 (1986) 471?513], of microcracked materials when the microcracks are closed with a friction between their lips. That leads to a macroscopic model coupling damage and plasticity where the plasticity yield criterion is of the Drucker–Prager type with kinematical hardening. Adopting an associative flow rule for the plasticity and a standard energetic criterion for damage, the properties of such a model are illustrated in a triaxial test with a fixed confining pressure.