Micromechanics modelling for stress–strain behaviour of brittle rocks

Abstract

AbstractA micromechanics model for stress–strain behaviour of brittle rocks has been developed. Microcracking is the mechanism of the non‐linear deformation behaviour for brittle rocks in the pre‐peak stage. The non‐linear behaviour in this stage is simulated by considering the local axial splitting of microcracks. The relationships between the compressive stresses, the growth of microcracks, and the fracture‐induced deformation are analytically established. In the post‐peak stage the shear faulting predominates the process of deformation, which is simulated by a damage model. This micromechanics model is helpful in understanding the failure process in brittle rocks. The model can be used to simulate the complete stress–strain behaviour of rock. The model simulations are consistent with experimental results.