A micromechanical model for the elasto-viscoplastic and damage behavior of a cohesive geomaterial

Ariane Abou-Chakra Guéry (1) , Fabrice Cormery (1) , K. Su , Jian-Fu Shao (1) , Djimedo Kondo (1)

1 LML - Laboratoire de Mécanique de Lille - FRE 3723

A Hill type incremental homogenization method was recently proposed by Abou-Chakra Guéry et al. [Abou-Chakra Guéry, et al., 2008. A micromechanical model of elasto-plastic and damage behavior of a cohesive geomaterial. Int. J. Solid. Struct., 45(5), 1406–1429] for the elasto-plastic damage behavior of a cohesive geomaterial, the Callovo–Oxfordian argillite. The aim of this paper is then to extend the homogenization method to its time-dependent behavior. The argillite is now seen as a three phase composite with an elasto-viscoplasticity matrix and elastic damaged calcite grains and elastic quartz grains. Considering that the incremental formulation of Hill cannot rigorously be used, we proposed a new modified incremental method. A validation of its predictions against experimental data is then conducted.

Mots clés: Geomaterials; Nonlinear homogenization; Elasto-viscoplasticity; Damage; Clay rock; Micromechanics

Ariane Abou-Chakra Guéry, Fabrice Cormery, K. Su, Jian-Fu Shao, Djimedo Kondo. A micromechanical model for the elasto-viscoplastic and damage behavior of a cohesive geomaterial. Physics and Chemistry of the Earth. Parts A/B/C, 2008, 33 (Supplément 1), pp.S416-S421. ⟨10.1016/j.pce.2008.10.007⟩. ⟨hal-00351386⟩