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Etude de la rétention d'eau et de la consolidation des sols dans un cadre thermo-hydro-mécanique

Abstract : This work is concerned with the study of water retention and consolidation of unsaturated soils in a thermo-hydro-mechanical framework. It is organized into two parts which deal respectively with deformation and temperature effects on hydric behaviour, and suction and temperature effects on mechanical behaviour. In the first part, we point out the relevance of the characteristic surface concept for soils as opposed to the retention curve, which has limited modelling power in the case of deformable media. The characteristic surface concept is experimentally illustrated for the example of a clayey silty sand. Its modelling is based on a large sample of experimental investigations with about 240 measurements of the triplet void ratio, water content, suction. In addition, a thermo-hydric behaviour model is proposed in order to determine the characteristic surface and the retention curve for a given temperature. This model is validated for the case of two materials : a ceramic and a clayey silty sand through direct testing, and for other materials on the basis of an analysis of the literature. Finally, we present an application to the determination of the permeability of unsaturated soils taking into account deformation and temperature. In the second part, temperature and suction effects on the mechanical behaviour are studied through consolidation tests on "Sion" silt. These tests are performed for different temperatures and suctions. For each test, swelling and compression indexes, as well as the preconsolidation pressure are measured. The influence of temperature and suction on these essential parameters of mechanical behaviour is determined. Finally, we propose a theoretical model which account for preconsolidation pressure as a function of temperature and suction.
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Simon Salager. Etude de la rétention d'eau et de la consolidation des sols dans un cadre thermo-hydro-mécanique. Sciences de l'ingénieur [physics]. Université Montpellier 2, sciences et techniques du Languedoc, 2007. Français. ⟨tel-00567000⟩

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