Modélisation micromécanique des milieux granulaires partiellement saturés

Abstract : Unsaturated soils, and, more generally, multi-phase granular materials, have been mainly studied in the framework of continuum mechanics. As the behavior of these materials depends on particle interactions, a micromechanical approach is proposed, based upon numerical simulations using the Discrete Element Method. At low water contents, the presence of water leads to the formation of menisci between neighboring grains that can be well interpreted by the capillary theory. Starting from the local description of the capillary effects, a 3D discrete model has been developped. Macroscopic properties of low saturated granular materials are then investigated, both in terms of water retention and shear strength, from direct simulations on numerical granular assemblies. Besides, homogenisation techniques are performed. The analyses prove the crucial role of pore fluid distribution in the bulk, and computations allow a capillary stress tensor to be exhibited from capillary forces. Emphasizing this capillary stress contribution, the effective stress is reviewed. Finally, an application is proposed to simulate the wetting induced collapse of unsaturated materials.
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https://tel.archives-ouvertes.fr/tel-00363961
Contributor : Luc Scholtes <>
Submitted on : Friday, March 6, 2009 - 10:08:38 AM
Last modification on : Friday, November 30, 2018 - 3:38:27 PM
Long-term archiving on : Friday, September 24, 2010 - 11:17:57 AM

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  • HAL Id : tel-00363961, version 4

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Luc Scholtes. Modélisation micromécanique des milieux granulaires partiellement saturés. Sciences de l'ingénieur [physics]. Institut National Polytechnique de Grenoble - INPG, 2008. Français. ⟨tel-00363961v4⟩

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