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

MONTPELLIER-BU Sciences (341722106) / SudocSudocFranceF

Thermo-mechanical Behaviour of a Soil. Yield Surface Evolution

International audienceThis paper presents a study of temperature influence on the yield surface for saturated and unsaturated soils. It lies within the framework of characterization and modelling of soil behaviour on thermo-hydro-mechanical loading. In this study, clayey silty sand samples are subjected to mechanical consolidation tests at different temperatures and fixed suctions. These experimental tests make it possible to determine the yield surface evolution according to temperature ranging between 20 • C and 60 • C. For the studied soil, the experimental study shows a thermo-extensible nature of the yield surface. An explanation of this result is proposed while gone by microscopic considerations in touch with capillary meniscuses evolution according to temperature and suction

Thermo-mechanical Behaviour of a Soil. Yield Surface Evolution

International audienceThis paper presents a study of temperature influence on the yield surface for saturated and unsaturated soils. It lies within the framework of characterization and modelling of soil behaviour on thermo-hydro-mechanical loading. In this study, clayey silty sand samples are subjected to mechanical consolidation tests at different temperatures and fixed suctions. These experimental tests make it possible to determine the yield surface evolution according to temperature ranging between 20 • C and 60 • C. For the studied soil, the experimental study shows a thermo-extensible nature of the yield surface. An explanation of this result is proposed while gone by microscopic considerations in touch with capillary meniscuses evolution according to temperature and suction

Influence de la température sur la courbe de rétention d'eau de milieux poreux

International audienceThis paper concerns the influence of temperature on the water retention curve of porous media. We present a model based on the differential of suction as a function of temperature, water content and void ratio. When adjusted for a given temperature, this model is able to predict the curve for any temperature.The model was validated by several tests on a ceramic (terra cotta) and a clayey silty sand at 20 and 60 ◦C. The application of the model to data found in the literature confirms its predictive power for a wide range of porous materials.Cette Note concerne l'influence de la température sur la courbe de rétention d'eau d'un milieu poreux. On présente un modèle, basé sur la différentielle de la succion en fonction de la température, de la teneur en eau et de l'indice des vides. Connaissant la courbe de rétention à une température donnée, le modèle permet de la prédire pour d'autres températures. Des résultats d'essais expérimentaux, réalisés à 20 et 60 • C, sur une céramique (terre cuite) et un sable limoneux-argileux, permettent de valider le modèle. L'application du modèle à d'autres résultats de la littérature montre sa capacité à couvrir une large gamme de matériaux poreux

Évolution de la cohésion dans un matériau granulaire : de la capillarité à la cimentation

International audienc

Compression tests on a sandy silt at different suction and temperature levels.

peer reviewedThis paper presents a unified thermo-mechanical experimental study on a remoulded unsaturated sandy silt and brings a contribution to the understanding of the fundamental mechanics of unsaturated soils in non-isothermal conditions. The experimental program was carried out at four temperatures and four suction levels using two thermo-hydro-mechanical (THM) cells, one isotropic and the other oedometric. The effect of suction and temperature on the compressibility and on the apparent preconsolidation pressure of the soil is addressed. Finally, an analytical expression of the evolution of the apparent preconsolidation pressure with respect to temperature and suction is proposed