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Une étude expérimentale du comportement poromécanique d'une roche fragile saturée
In this paper, laboratory investigations are presented concerning the effects of induced oriented microcracks on poromechanical properties in brittle cohesive geomaterials. The material studied is a Vosges sandstone for which the anisotropic damage by microcracking is considered as the main mechanism of inelastic deformation and failure. Specific testing procedures suitable for coupled hydromechanical loading paths are proposed. The poroelastic behaviour of the material in undamaged state is first investigated through various hydrostatic loading tests, and the initial poroelastic coefficients are determined. Progressive degradation of material elastic properties, particularly the induced anisotropy of mechanical behaviour, is then shown through triaxial compression tests with unloading reloading cycles. Effects of induced anisotropic damage on poromechanical coupling are finally investigated by conducting various coupled loading paths independently piloted with stresses and pore pressure. Based on an incremental formulation of the poroelasticity theory coupled with anisotropic damage, the material poroelastic coefficients at different damage states are determined from these tests. The correlation between damage evolution and tangent values of anisotropic Biot coefficients are clearly shown.
Une étude expérimentale du comportement poromécanique d'une roche fragile saturée
In this paper, laboratory investigations are presented concerning the effects of induced oriented microcracks on poromechanical properties in brittle cohesive geomaterials. The material studied is a Vosges sandstone for which the anisotropic damage by microcracking is considered as the main mechanism of inelastic deformation and failure. Specific testing procedures suitable for coupled hydromechanical loading paths are proposed. The poroelastic behaviour of the material in undamaged state is first investigated through various hydrostatic loading tests, and the initial poroelastic coefficients are determined. Progressive degradation of material elastic properties, particularly the induced anisotropy of mechanical behaviour, is then shown through triaxial compression tests with unloading reloading cycles. Effects of induced anisotropic damage on poromechanical coupling are finally investigated by conducting various coupled loading paths independently piloted with stresses and pore pressure. Based on an incremental formulation of the poroelasticity theory coupled with anisotropic damage, the material poroelastic coefficients at different damage states are determined from these tests. The correlation between damage evolution and tangent values of anisotropic Biot coefficients are clearly shown.
Une étude expérimentale du comportement poromécanique d'une roche fragile saturée
Karami, M. H. (author) / Sibai, M. (author) / Shao, J. F. (author)
Revue Française de Génie Civil ; 4 ; 109-142
2000-01-01
34 pages
Article (Journal)
Electronic Resource
Unknown
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