Optimizing the design of rockfall embankments with a discrete element method

Abstract

This paper’s intent is to contribute to the design of massive rockfall protective structures, such as embankments. The relationship between the block and the embankment characteristics remains a key issue in evaluating the efficiency of the impacted structure. Because of the large deformation process occurring during an impact, the discrete element method (DEM) was chosen in this study to assess the respective influence of the geometrical and mechanical properties of the embankment. It has been seen that the maximum impact force transmitted to the embankment is governed not only by the kinetic energy of the block, but also by the stiffness and the upstream side inclination of the construction. Moreover, it has been observed that the dissipative capacity of the construction depends more on its geometrical properties than on its mechanical properties. The inclinations of both sides of the embankment are relevant, but the crest thickness, seldom considered in the design protocols, is one of the foremost parameters to think about. The use of a large crest thickness, rather than an abutment, optimizes the space required for the construction, while maintaining a comparable dissipative capacity.