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Couplage hydro-mécanique et transfert dans l'argilite de Meuse/Haute-Marne : approches expérimentale et multi-échelle

Abstract : This thesis deals with the hydro-mechanical behaviour of argillite. Classical Biot theory is shown to be badly adapted to the case of argillite. An original state equation is then built by use of homogenization tools, and takes into account the microstructure of argillite as well as physical phenomena happening inside the material, like the swelling overpressure inside the clay particles or the capillary effects in the porous network. This state equation explains some experiments which were not by the classical Biot theory. It is then improved by integrating the experimental data that are the dependancy of the elasticity tensor with the saturation degree and the existence of a porosity surrounding the inclusions. Combined with the monitoring of length variation under hydric loading, this relevant state equation permits one to determine the Biot tensor of argillite. Since this state equation is coupled with the hydric state of the material, one is interested in modelling the variation of the saturation degree during a drying process. Two transport models are studied and compared, then a model for the porous network is proposed in order to explain the unusual permeability measurements.
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Submitted on : Monday, January 17, 2011 - 11:10:32 AM
Last modification on : Friday, July 17, 2020 - 5:08:35 PM
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  • HAL Id : pastel-00556546, version 1

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Sophie Cariou. Couplage hydro-mécanique et transfert dans l'argilite de Meuse/Haute-Marne : approches expérimentale et multi-échelle. Matériaux et structures en mécanique [physics.class-ph]. Ecole des Ponts ParisTech, 2010. Français. ⟨NNT : 2010ENPC1006⟩. ⟨pastel-00556546⟩

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