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Article Dans Une Revue Meccanica Année : 2019

A numerical experiment of backward erosion piping: kinematics and micromechanics

Résumé

We report on a numerical experiment by which we investigated the propagation of an erosion pipe in a water saturated granular soil. The simulation was performed with a two-dimensional implementation of the coupling between the discrete element method and the lattice Boltzmann method. A synopsis of the numerical scheme is provided. The specimen and testing conditions were designed as representative of the pipe front region. The kinematics of mobilisa-tion and fluidisation of the granular mass were investigated based on the physically-motivated definition of particle velocity thresholds. We measured a constant mass erosion rate, up to a clogging event. The study includes a micromechanical analysis of the response of the granular skeleton. We emphasise the influence of the unloading-induced damage on the erosion path, and the relevance of force chain arching as a self-organised resistance mechanism.
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Dates et versions

hal-02305966 , version 1 (04-10-2019)

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Francesco Froiio, Carlo Callari, Andrea Francesco Rotunno. A numerical experiment of backward erosion piping: kinematics and micromechanics. Meccanica, In press, ⟨10.1007/s11012-019-01071-7⟩. ⟨hal-02305966⟩
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