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Couplage électro-chimio-hydro-mécaniques dans les milieux argileux

Abstract : The aim of fuis study is to understand coupled phenomena that occur in swelling porous materials like clays. Electro-chemo-hydro-mechanical contributions are taken into account to analyze transfers in such minerais. ln a first fart, an general discussion is proposed to introduce mineralogical and physico-chemical considerations of clayey media. An important objective of this chapter is to show the crucial role of the microstructure. ln a second part is presented an imbibition test in a MX80 bentonite powder. The hydraulic diffusivity versus water content curve's decrease is explained thanks to a double porosity model that shows the progressive collapse of mesopores due to swelling effects at the microscale. Thus a multi- scale analysis is necessary to weil describe clayey media behaviour. The third chapter exposes such a multi-scale modelling (periodic homogenization). It is based on the double-layer theory and introduces an innovative concept of virtual electrolyte solution. First numerical results are given in a simple geometry (parai lei platelets). ln the next part are proposed numerical simulations of two kinds : response of the system to a chemical gradient and simulation of electro-osmosis. The end of this chapter puts into relief the necessity to integrate pH effects in the model. In the last part, chemical surface exchanges are incorporated in the modelling to understand pH and ionic force roles in electro-osmotic process.
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Thibault Lemaire. Couplage électro-chimio-hydro-mécaniques dans les milieux argileux. Autre. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL116N⟩. ⟨tel-01749696⟩



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