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Impact de l’érosion interne sur la stabilité d’une digue : approche innovante par modélisation multiphysique de l’aléa

Abstract : A numerical model has been developed for internal erosion. It is based on the approach of continuous porous media. The soil skeleton saturated by a pore fluid (water) is treated as the superposition of four constituents in interaction: solid skeleton, erodible fines, fluidized particles and fluid. The detachment and transport or advection of fine particles are modeled by the mass exchange between solid and fluid phases. In order to take into account the influence of the change in void ratio induced by internal erosion on the soil skeleton, a critical state based constitutive model is used to calculate the effective stress-strain response of the soil skeleton. This coupled hydro-mechanical analysis is applied to study the impact of erosion on a dyke. The numerical simulations show the progressive development of internal erosion within the foundation of the dyke. The effect of the mechanical degradation due to internal erosion is demonstrated by evaluating the factor of safety of the dyke slope by means of the shear strength reduction method
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Farid Laouafa, Jie Yang, Zhen-Yu Yin, Pierre-Yves Hicher. Impact de l’érosion interne sur la stabilité d’une digue : approche innovante par modélisation multiphysique de l’aléa. Rapport Scientifique INERIS, 2018, 2017-2018, pp.46-47. ⟨ineris-02044870⟩

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