Numerical Simulation of the Collapse of Granular Columns Using DEM

Abstract

In this paper, the collapse of plain strain dry granular columns was investigated by means of 3D DEM (Discrete Element Method) simulations. In the literature, 2D DEM analyses have been previously performed and showed to be unable to replicate the experimentally observed mass flow and final run-out distances. This is mainly due to the inability of 2D simulations to replicate the three dimensional motion of real particles. Spherical particles and a simple contact model based on linear springs, dashpots and frictional sliders were employed in the presented simulations. A rolling resistance model governed by two micromechanical parameters was added in order to indirectly account for the effect of particle non-sphericity on the angular moment equilibrium of the granular assembly. Calibration of the rolling resistance model leads to predictions of run-out distances in quantitative agreement with the available experimental data.