Simulation of time-dependent crack growth in brittle rocks under constant loading conditions

Based on the theory of subcritical crack growth, linear elastic fracture mechanics (LEFM), and Charles equation, a lifetime prediction scheme has been developed for rock specimens containing initial microcracks under constant loadings. Numerical simulations were performed utilizing the developed modeling scheme. Lifetimes were obtained through numerical calculation; the damage process and macroscopic fracture pattern of the models were studied. Typical fracture pattern, like tensile cracks and shear bands, were observed. A few preliminary studies were also performed to compare the results with in situ observations. Conclusions were drawn and possible improvements to future research work are proposed.