Abstract
The excavation process of the underground repository galleries creates an Excavation Damaged Zone (EDZ) in which the properties of the host media are locally altered. Since the development of shear bands has been observed during the excavation of underground research facilities in potential clay host rocks, it is proposed here to model the extension of damaged zone by the strain localization approach. Numerical modeling of strain localization needs a specific approach to overcome the practical problem of mesh size dependency within the framework of classical finite elements. To overcome this problem, the second gradient method which has been incorporated into the finite element code Lagamine is proposed in this paper. The objective of this study is to perform the hydro-mechanical modeling of a gallery excavation in Boom Clay (Belgium) accomplished by the analysis of strain localization in shear bands mode: the thickness and evolution of EDZ during the gallery excavation are exhibited through the analysis of plastic zone and increment of deviatoric strain.
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