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Modélisation micromécanique des roches poreuses. Application aux calcaires oolitiques

Abstract : This work is devoted to the modelling of the linear and non-linear hydro-mechanical behaviour of porous rocks (such as oolitic limestone, iron ore) by the multiscale modelling approach. Based on microstructure observations, a conceptual model was proposed. Porous rocks studied are constituted by an assemblage of grains (oolites), with high volume fraction, coated by a matrix. The overall porosity is supposed connected and decomposed into oolite porosity and matrix porosity. A two step homogenization method has been developed in the framework of CSA models (Composite Sphere Assemblage). The effect of interfacial bonding condition on poroelastic properties of composite sphere is investigated by determining the exact solution of the model in the case of perfect or/and imperfect interface. Micromechanical model is applied firstly to estimation of effective linear poroelastic properties of rocks studied. Their non-linear behaviour is studied by considering a elasto-plastic behavior for both the matrix and the interfaces (oolite-matrix). The comparison between numerical simulations and macroscopic experimental results underlined the crucial role of the interfacial transition zone
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Ngoc Bien Nguyen. Modélisation micromécanique des roches poreuses. Application aux calcaires oolitiques. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL082N⟩. ⟨tel-01748849⟩

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