A method for the study of crack propagation in rock structures

A method is presented for analysing the stability of rock structures based on the propagation of geological discontinuities. Discontinuities are modelled as flat cracks and their propagation is analysed using fracture mechanics methods, As rock structures are brittle, these phenomena can be studied using linear elastic fracture mechanics (LEFM). Problems in the application of LEFM methods are analysed, with regard to the states of compressive stress present in rock. A numerical procedure is described which simulates the propagation of natural discontinuities in rock; the crack propagation trajectories determined from this analysis are compared with experimental results obtained on mortar specimens. The applicability of the method to the study of rock mass stability is shown with reference to the behaviour of rock slopes.