Modeling the strain localization around an underground gallery with a hydro-mechanical double scale model; effect of anisotropy

This paper concerns the application of a finite element squared approach for modelling hydromechanical coupling in the simulation of gallery excavation in the context of radioactive waste repositories. The micromechanics of Callovo-Oxfordian claystone is modelled at the microscale, taking into account the interaction of different mechanical constituents and its interaction with pore fluid. In a framework of computational homogenization, the micromechanical behaviour is coupled to the macroscale boundary value problem of a poromechanical continuum with local second gradient paradigm. The simulations concern several cases of the Transverse action benchmark by Andra, in the context of which the model is used. (C) 2016 Elsevier Ltd. All rights reserved.