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Problèmes de thermodynamique et de thermo-hydro-mécanique associés à l'exploitation du sous-sol

Abstract : My research activities are fueled by the various challenges inherent to the exploitation of the subsurface such as energy storage, complex deposit exploitation or deep storage of radioactive waste. Combined, these research areas put up a broad multidisciplinary field that I undertook about sixteen years ago. Considering the complexity and diversity of the scientific disciplines included, my contribution in those domains was of different natures, but was always keeping a global approach, based on a macroscopic understanding of the encountered phenomena. In this dissertation, divided into 4 chapters, I rather focused on the modeling aspects. In the first chapter which will serve as the basis for the following ones, I undertake the presentation of the general framework of thermodynamics of continuous media in order to establish the balance equations among which there are still some of them, like the energy balance, that are not completely understood especially in the case of open systems which are of interest to me. These systems, in addition to being multicomponent and multiphase, can undergo a change of mass via chemical reactions or phase change. The second chapter deals with the constitutive laws and addresses in particular the ones governing the complex behavior of the geomaterials forming host rocks suck as rock salt. The third chapter is dedicated to energy storage. In this field, which gives the subsurface an essential role in the current energy transition, I detail the approach I adopted for the realization of Demether ; a software dedicated to solving thermodynamic problems related to fluid storage in underground caverns and focusing more specifically on salt caverns. The last chapter concerns artificial ground freezing linked to the exploitation of complex mining deposits with non conventional methods, which poses scientific locks that are not only related to phases changes and to thermo-hydraulic behaviors but also to the mechanical behaviors and more generally to the predictive abilities of thermo-hydro-mechanical coupling models. I conclude with research perspectives that will aim to continue the current themes while consolidating each link in the chain : experimentation - modeling - simulation.
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Submitted on : Thursday, August 1, 2019 - 3:05:22 PM
Last modification on : Monday, December 14, 2020 - 9:48:42 AM
Long-term archiving on: : Wednesday, January 8, 2020 - 3:56:18 PM

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Ahmed Rouabhi. Problèmes de thermodynamique et de thermo-hydro-mécanique associés à l'exploitation du sous-sol. Matériaux et structures en mécanique [physics.class-ph]. Sorbonne Université, 2019. ⟨tel-02239077⟩

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