Modelling 3D jointed rock masses using a lattice spring model

Abstract

This study further develops the distinct lattice spring model (DLSM) to model jointed rock masses as a group of particles linked with spring bonds. This unified description of jointed rock masses is realised through the introduction of continuum- and discontinuum-based spring bonds into the DLSM. The joints are geometrically inputted as a group of triangles to aid in the generation of discontinuum-based spring bonds that are formed from a cutting operation between triangles and initial continuum-based spring bonds. A simple elasto-brittle model and Mohr–Coulomb constitutive model are introduced for the continuum- and discontinuum-based spring bonds to describe the mechanical responses of jointed rock masses. With these developments, the DLSM's ability to model jointed rock masses is demonstrated through numerical examples.