Practical approach to modelling of jointed rocks as Equivalent Continuum

This paper highlights the applicability of a simple equivalent continuum model for modelling jointed rock mass. In this model, the jointed rock properties are represented by a set of empirical relationships that express the properties of the jointed medium as a function of the properties of intact rock and joint factor. The model is implemented in Fast Lagrangian Analysis of Continua (FLAC) using FISH functions. The verification of the model is based on simulation of triaxial compression tests by comparing the experimental and numerical test results. The applicability of the model to field problems is investigated by undertaking numerical modelling of some case studies on large scale excavations in jointed rocks. The study shows the efficiency of the approach in estimating ground movement and stress distribution around the excavations. The model predicted the deformation values well and study confirmed the usefulness of this simple approach for simulation of underground and surface structures in jointed rocks.