Modélisation hydro-élasto-visco-plastique d’une galerie du laboratoire souterrain de Meuse/Haute-Marne de l'Andra

Abstract : Clay formations in their natural state show very favourable confining conditions with respect to underground storage due to their generally lo hydraulic conductivity, low molecular diffusion and significant retention capacity for some elements. This research work has been performed on Callovo-Oxfordian Clay (also called “Argillite”) in which Andra has constructed an underground research laboratory. As illustrated in figure 1 several specific in situ experiments were carried out with the main objectives basically to characterize the short and long term response of the rock to different drift construction methods in order to optimize the design of component and to assess the Excavation Damaged Zone (EDZ) and its evolution. The model developed by Souley et al. (2011 [4]) is phenomenological and elastic-visco-plastic and takes into account the short- and long-term responses of COx claystone. However, it only considers mechanical behaviour. More recently, Souley et al. (2017) [5] propose to extend this model in order to reflect: (a) the impact of excavation induced fracturing and damage on the delayed strains as indicated by in situ measurements at the Meuse/Haute-Marne URL; (b) hydro mechanical couplings in saturated conditions, (c) changes in the permeability, firstly in the EDZ. The new model is used to numerically simulate the excavation of the GCS drift of MHM-URL (figure 1). Comparisons with in situ measured data are presented in terms of change in strain and pore pressure fields, and then discussed to contribute to the understanding of the COx claystone. Improvement and discrepancy of the modelling are also discussed.
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Mountaka Souley, Jean-Bernard Kazmierczak. Modélisation hydro-élasto-visco-plastique d’une galerie du laboratoire souterrain de Meuse/Haute-Marne de l'Andra. Rapport Scientifique INERIS, 2017, 2016-2017, pp.32-33. ⟨ineris-01869660⟩

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