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Modélisation du comportement poromécanique des sols sujets à érosion interne par suffusion

Abstract : Seepage flows within soils are prone to induce internal erosion processes. Concerning cohesionless granular soils, “suffusion” is a kind of internal erosion characterized by three simultaneous processes: detachment, transport and interlocking of the fine particles of the soil through the pore network. As a strong correlation exists between internal erosion and most of the incidents occurring within hydraulic structures (dams, dykes and irrigation channels), these processes are directly involved in some major economic and society concerns. By focusing on suffusion, the main objective of this research is to contribute to the development of a engineering tool to face the abovementioned problems: a poromechanical model that couples suffusion and the hydromechanical behaviour of the considered soil. The thermodynamics of porous media is employed to analyze the coupling between suffusion, seepage flow and mechanical state. A poromechanical model is proposed in agreement. On the one hand, the effect of suffusion on the mechanical behaviour of the soil is modelled by extending an existing soil elasto-plastic model considering the suffusion induced porosity as a hardening variable. The model is then validated with respect to experimental results available in the literature. On the second hand, the macroscopic constitutive model coupling suffusion and seepage flow is tested considering a multi scale analysis using the (quasi) periodic homogenization theory.
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Submitted on : Tuesday, June 29, 2021 - 3:54:25 PM
Last modification on : Thursday, August 18, 2022 - 9:41:12 AM
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  • HAL Id : tel-03273944, version 1


Quentin Rousseau. Modélisation du comportement poromécanique des sols sujets à érosion interne par suffusion. Génie civil. École centrale de Nantes, 2021. Français. ⟨NNT : 2021ECDN0002⟩. ⟨tel-03273944⟩



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