Study on the Propagation Behavior of Parallel Fractures in Deep Rock Masses Under Explosive Loading

Under the combined dynamic and static effects of blast impact and high in situ stress, the failure mechanism of deep parallel fractured rock masses becomes more complex. Therefore, this study establishes a series of numerical models for blasting in deep fractured rock masses to simulate the evolution of fracture initiation and propagation induced by explosions in deep environments. From the perspectives of fracture spacing, fracture inclination angle, and in situ stress, the propagation of explosive stress wave and the crack propagation process are investigated. Based on the dynamic stress intensity factor, the propagation mechanism of parallel fractures is analyzed. By employing displacement trend lines, the fracture failure mode is identified, leading to the discovery of a new co‐directional relative tensile failure mode. The results indicate that when explosive stress wave passes through parallel fractures, they undergo refraction, reflection, and scattering, causing parallel fractures to weaken the transmission of explosion energy. To optimize blasting effectiveness, it is recommended to strategically place boreholes around parallel fractures.