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Modélisation du comportement élastoplastique anisotrope et endommageable des argilites : application au stockage des déchets radioactifs

Abstract : Deep clay formations such as Callovo-Oxfordian (COx) are one of the options currently being considered for the storage of radioactive waste disposal in France by the National Radioactive Waste Management Agency. Observations (deformation, pore pressure, ...) carried out on the scale of in situ structures at the Meuse/Haute-Marne underground research laboratory have, however, revealed complex hydromechanical behaviour with highly anisotropic induced fracturing that is difficult to capture and to reproduce using classical constitutive models. The work of this thesis focused on the formation of the connected fractured zone and discrete fractured zone induced by excavation and their consequences on transport properties. Based on experimental results and the recently developed rheological models of this rock, a macroscopic anisotropic, elastoplastic and damage constitutive model was proposed that describes the key mechanisms of the short-term (pre- and post-peak) behaviour of COx claystone. This model was implemented in Comsol Multiphysics®. The application of the proposed model was carried out on the GCS gallery of the LS M/HM by hydromechanical simulations under saturated conditions. The numerical results were successfully compared with in situ observations and measurements in terms of, in particular, pore pressure distribution, ZFC/ZFD extension (approached by the plastic zones in post-peak and pre-peak, respectively) and horizontal and vertical convergences. Finally, the operational character of the model for thermo-hydro-mechanical modelling applications of HA cells (Cigéo project) was investigated on a geometry reduced to a micro-tunnel of cells.
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Submitted on : Monday, June 28, 2021 - 11:40:44 AM
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  • HAL Id : tel-03272310, version 1

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E.D. Coarita-Tintaya. Modélisation du comportement élastoplastique anisotrope et endommageable des argilites : application au stockage des déchets radioactifs. Mécanique des matériaux [physics.class-ph]. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0245⟩. ⟨tel-03272310⟩

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