| Abstract: | The process and mechanism of impact fractures in sandstone were investigated under equal biaxial static compression. The cracking process was captured by a high‐speed video camera. The results indicate that the main crack propagates along the circumference and finally forms a crater‐shaped failure zone. The size of the crater‐shaped failure zone increases as the static stress and impact velocity increase. In addition, microscopic features of the fracture surface were observed using a scanning electron microscope. It was found that the microcracks expand after combination loading, making the rock more susceptible to damage. Finally, the influence mechanism of static loading on dynamic failure of the rock was revealed by theoretical analysis and numerical simulation. |
