Simulation of wire mesh bearing capacity using the distinct element method (DEM)

Abstract

The response of wire mesh sheets anchored with rock bolts to excavation surfaces has been investigated using the distinct-element method (DEM). Wire mesh reinforcement is a common practice both in mining and civil underground structures, providing passive support in case of unstable blocks. When the mesh is not embedded in a sprayed concrete layer, its design is usually performed based on statistical analyses of laboratory test results according to Eurocode. A laboratory-based approach can result in technical and economical limitations, especially when studying non-conventional or accidental design scenarios such as asymmetric loading or failure of the anchoring rock bolts. The simulation of the loading of a sheet of wire mesh has been performed with 3D-DEM software (PFC3D, Itasca) by discretizing the wire elements as connected particles which can simulate the progressive failure mechanism of the wire mesh observed in laboratory tests. The strength and deformability of the wire elements were calibrated to replicate laboratory results. Based on a limited amount of laboratory test data required for calibration, the investigated approach can complement laboratory results by providing an estimation of the expected strength and strain of the wire mesh reinforcement system under various loading scenarios.