Discrete modelling of hexagonal wire meshes with a stochastically distorted contact model

• Published in: Computers and geotechnics 2013-04, Vol.49, p.158-169
• Main Authors: Thoeni, Klaus, Lambert, Cédric, Giacomini, Anna, Sloan, Scott W.
• Format: Article
• Language: English
• Subjects: Computer simulation; Contact; Discrete element method (DEM); Distortion; Double-twisted hexagonal mesh; Dynamic response; Finite element method; Mathematical models; Probability theory; Randomness; Remote interaction; Rockfall protection; Wire mesh; Wire structure
• ISSN: 0266-352X; 1873-7633
• DOI: 10.1016/j.compgeo.2012.10.014

This paper presents an improved discrete element model, which incorporates stochastically distorted contact mechanics, for the simulation of double-twisted hexagonal wire meshes that are commonly used in rockfall protection. First, the characteristics of such meshes are investigated by conducting quasi-static and dynamic experimental tests. Second, the discrete model for the simulation of such meshes is presented. A stochastically distorted contact model is introduced to account for distortions of the wires and hexagons, allowing a more realistic representation of the mechanical response of the mesh from the deformation point of view and the force point of view. Quasi-static tensile tests of a plane net sheet, subjected to a constant strain rate, are used to study the effect of the stochastically distorted contact formulation and to calibrate the numerical model. Finally, the dynamic response of an impacting block on a horizontal mesh sheet is used to compare the numerical predictions against experimental results in order to validate the proposed approach.