3D Modeling of Piping Mechanism Using Distinct Element Method

A 3D coupled continuum-discrete hydromechanical model was utilized to simulate the pore fluid flow and solid particle transport during piping in a micro scale. The fluid phase was implemented using the "fixed coarse-grid" fluid scheme based on Navier-Stokes equations and the solid phase which consists of an assemblage of discontinuous particles can be modeled effectively using DEM. Numerical simulations were conducted to investigate the mechanisms of macro-meso response of fluid and grains during piping in the presence of increase hydraulic gradient. The fluid velocity, loss fraction of eroded particles, pathway of moving particles, and etc are traced and recorded. The outcome of these simulations was consistent with experimental observations and revealed valuable information on the micro-mechanical characteristics of piping in sandy soil.