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Modélisation de la zone endommagée induite par le creusement du puits d'accès au laboratoire souterrain de Meuse/Haute-Marne (argilites de l'Est)

Abstract : From a geomechanical point of view, the safety of an underground storage for the radioactive waste requires to characterize the damaged zone induced by the shaft sinking for the storage cavities. Then, the objective of this thesis is to simulate the hydro-mechanical response of the East argilites to the shaft sinking for the Meuse/Haute-Marne underground laboratory, in order to compare the results to the in situ measurements which will be recorded in 2005 (REP experiment).
Firstly we have analysed all the mechanical tests which had been carried out from 1995 to 2001. We have observed that each series has his own coherence, in terms of elastic parameters, mechanical strength or creep capacity. But there are some strong différences between the series. These différences, which are due to the experimental protocols and not to the material itself, have shown three important results : the resaturation phases imposed by several laboratories have deteriorated the mechanical properties of the East argilites, the existence of an effective stress is not evident for these argilites, and their mechanical strength increases when they are dried.
From these tests, we have distinguished three mechanisms that produce irreversible strains: compaction, pre-failure, failure. We have described each of them by a straightforward elasto-plastic model, based on the Mohr-Coulomb or Drücker-Prager criterion, with a linear softening. Thus we obtain a complete rheological model for the East argilites by considering simultaneously the three mechanisms (multi-criterion plasticity).
Lastly, from the modelling we carried out, we can conclude that: to take into account the irreversible strains that occur before the failure has a great influence on the seize of the failure zone around the shaft (it is very small with respect to the case where the behaviour is elastic until the failure); the pore pressure diffusion modifies very little the mechanical response of the massif (the plastic strains created by the mechanical unloading don't evolve during the drainage of the massif); the anisotropy of the natural horizontal stresses has a great influence on the excavation damaged zone (polarization in azimuth); finally, we have shown that the details of the excavation phasing are dispensable.
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Submitted on : Thursday, March 24, 2011 - 11:41:29 AM
Last modification on : Wednesday, October 14, 2020 - 4:02:28 AM
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  • HAL Id : pastel-00579579, version 1


Baptiste Miehe. Modélisation de la zone endommagée induite par le creusement du puits d'accès au laboratoire souterrain de Meuse/Haute-Marne (argilites de l'Est). Géologie appliquée. École Nationale Supérieure des Mines de Paris, 2004. Français. ⟨NNT : 2004ENMP1274⟩. ⟨pastel-00579579⟩



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