  In this paper, we investigate some micromechanical aspects of
elasto-plasticity in heterogeneous geomaterials. The aim is to upscale the
elasto-plastic behavior for a representative volume of the material which is
indeed a very challenging task due to the irreversible deformations involved.
Considering the plastic strains as eigen-strains allows us to employ the
powerful tools offered by Continuum Micromechanics which are mainly developed
for upscaling of eigen-stressed elastic media. The validity of such
eigen-strain based formulation of multiscale elasto-plasticity is herein
examined by comparing its predictions against Finite Element (FE) simulations.
