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.
Fichier principal
froiio-callari-rotunno-2019-preprint-v191004.pdf (18.64 Mo)
Télécharger le fichier
Origine | Fichiers produits par l'(les) auteur(s) |
---|
Loading...