Dynamic Phase-Field Modeling of Shear Fractures in Rocks Under Impact Loading

The phase-field method is a powerful method for simulating crack initiation, extension, branching, and coalescence. In this paper, we present a phase-field model for dynamic fracture in rock-like materials under multi-axial compression. Our dynamic phase-field model incorporates an energy decomposition method based on the Drucker–Prager failure criterion, allowing for a representation of asymmetric tensile–compressive fracture behavior under impact loading. Numerical results show that compared to conventional phase-field models, the new model is more suitable for rock fracture because of its capability of distinguishing between shear and compression fracture. In addition, laboratory experiments of pulse hydraulic fracturing were further conducted to validate the model.