The discrete (or distinct) element method (DEM) has been recently recognized as efficient numerical tool for solving many scientific and technological problems in various fields of engineering. The method started in the 70-ies with its first application to simulate the dynamic behaviour of granular material in the work of Cundall and Strack [1]. Unlike the continuum approach, the DEM presents particulate material as an assemblage of discrete elements. It is based on the Lagrangian approach, according to which particles of granular material are treated as contacting bodies, while the dynamical parameters (i. e. position, velocity, orientation, etc.) of each body are tracked during the simulation. Some variations on the theme of DEM and granular materials may be found in [2]–[5].