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Caractérisation du comportement couplé des argilites de Meuse/Haute-Marne aux états saturé et partiellement saturé

Abstract : The framework of this thesis is to study the possibility to realize the underground waste isolation project in the clayey Callovo-Oxfordien. The layer is constituted of swelling clay rock called Meuse/Haute-Marne argilite. The aim is to define the behaviour of this rock by thermo-hydro- mechanical model proposed by Coussy (1991, 1995) at the saturated and partially saturated states. The parameters of this model can be measured by the direct or indirect experimental process. We realise different tests to determinate fluids transport properties in saturated and partially saturated conditions. The difficulty of these kinds of tests is the very low permeability of the argilite. That is why the transitive method has to be used. ln quasi saturated conditions "the pulse test" method is chosen. This process proposed by Hsieh et al. (1881) allows the measurement of the intrinsic permeability, k, and the specific storage coefficient, Ss. These experiments have permitted to measure the order of magnitude of these two parameters and to estimate the anisotropy magnitude of permeability. The results of the series of investigation were compared to results obtained from other laboratories at the polytechnic school of Paris and the University of Lille. The conclusion of this comparison is that similar results were obtained. ln the partially saturated conditions we have developed an original method to estimate the apparent permeability and the capillary capacity of argilite samples. Numerical analyses have permitted to mode! the bidirectional diffusion of liquid and gas fluid phases. Final tests consisted in wetting and drying cycles at different temperatures using microgravimetric and saturated saline solution methods. The aim is to verity the hypothesis that the saturation depends on the meniscus superficial tension gas/water only. We displayed the degrees of saturation as a function of capillary pressure at different temperatures. This graphic demonstrated that the hypothesis is not completely correct. The difference between theoretical and experimental results depends on the mode of interpretation of these results and the paths followed during the tests wetting or drying.
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Mohamed Amine Koriche. Caractérisation du comportement couplé des argilites de Meuse/Haute-Marne aux états saturé et partiellement saturé. Autre. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL057N⟩. ⟨tel-01750039⟩



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