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Influence des cycles hydriques de la dessiccation et de l'humidification sur le comportement hydromécanique des géomatériaux non saturés

Abstract : This work focuses on the behaviour of porous triphasic media, particularly on unsaturated soils subjected to hydromechanical loading. A coupled elastoplastic constitutive model has been developed. This original model is formulated according to the following principles: (1) a constitutive law describing the behaviour of different phases (solid skeleton, liquid and gas). (2) coupling relationships between each phase. For the behaviour of the solid skeleton, a non associated elastoplastic constitutive law is adopted, with two loading surfaces: shear surface and compression cap surface. The hydric part is discribed using a formulation which allows to take into account the hysteresis effect. This model has been extended using a hydromechanical coupling relation between the air entry value and the porosity. Then the coupling is completed with the Bishop effective stress, using a new definition for the suction parameter χ. Using this formulation, the various phenomena present in the porous media behaviour under different loading can be reproduced. The developed model has been validated through a comparison with experimental data on different types of soil (sand, silt,...). This model is implemented in the french finite element code Cast3M. The analysis of specific problems, such as (1) the study of shallow foundation subjected to cyclic rain event, as well as (2) the study of slope stability, show the model capacity to reproduce the behaviour of unsaturated porous media.
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https://tel.archives-ouvertes.fr/tel-00838855
Contributor : Wahib Arairo <>
Submitted on : Wednesday, June 26, 2013 - 4:40:56 PM
Last modification on : Friday, October 23, 2020 - 4:33:24 PM
Long-term archiving on: : Friday, September 27, 2013 - 5:00:16 AM

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  • HAL Id : tel-00838855, version 1

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Arairo Wahib. Influence des cycles hydriques de la dessiccation et de l'humidification sur le comportement hydromécanique des géomatériaux non saturés. Mécanique des matériaux [physics.class-ph]. INSA de Lyon, 2013. Français. ⟨tel-00838855⟩

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