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Assessment of coupled scale computational models for the permeability evolution induced by excavation damage in heterogeneous rocks

par Massart, Thierry,Jacques ;Selvadurai, Patrick A.P.S.
Référence EUROCK 2015(7-10 october 2015: Salzburg), Proceedings of the 64th Geomechanics colloquium - EUROCK 2015
Publication A Paraître, s.d.

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Résumé :

The assessment of geological repositories for hazardous materials requires the modelling of coupled phenomena involving mechanical and fluid transport processes. In many poromechanical simulations, material parameters such as the elastic stiffness or the permeability are assumed constant. However, the porous fabric of rocks exhibits complex heterogeneous microstructures, which can experience micromechanical cracking. The evaluation of the effects of the excavation damage zone on the fluid transport phenomenon is therefore of crucial importancefor a proper account of the potential contaminant transport. This contribution addresses the application of an off-line two-scale finite element approach to evaluate the material degradation caused by excavation. The use of mechanical simulations as a basis for reproducing the experimental permeability evolution by computational homogenization of degraded RVEs (Representative Volume Elements) is assessed for an excavation scenario