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

•A lifetime prediction scheme was developed for rock under constant loadings.•Numerical simulations were performed utilizing the developed modeling scheme.•The damage process and macroscopic fracture pattern of the models were studied.•Typical fracture patterns were observed in the numerical models.•Preliminary studies were performed through numerical modeling.

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.