DEM simulation of granular media—structure interface: effects of surface roughness and particle shape

An enhanced discrete element method for the numerical modelling of particulate media is presented. This method models a particle of general shape by combining several smaller particles of simpler shape, such as a circle, into clusters that act as a single larger particle. The clusters more accurately model the geometry- dependent behaviour of the particles, such as particle interlock and resistance to rolling. The method is implemented within the framework of an existing DEM program without the introduction of new contact or force algorithms. An extensive set of numerical ‘experiments’ is performed which demonstrate the method's effectiveness. The granular media–structure interface shear test simulations are performed using both clustered and non-clustered particles. The results indicate that the clustered particles undergo less rolling and provide for increased shear resistance of the medium. Copyright © 1999 John Wiley & Sons, Ltd.