Numerical Simulation of Blasting Excavation Induced Damage Under Different In-Situ Stress Conditions

No matter with what kinds of control blasting technologies, the blasting excavation will cause damage to the remaining rock. Representative physico-mechanical properties were studied out according to the engineering geological data of Luling mine. Relying on site blasting parameters, combined with ANSYS/LS-DYNA software, the hard rock and soft rock in different in-situ stress conditions of the blasting excavation were simulated. The numerical results show that, in the 5 to 25 MPa in-situ stress level, the damage degree of surrounding rock near blasting cavity does not increase with the increase of in-situ stress, but the degree of the rock damage caused by explosion shock load is significantly reduced away from explosion cavity. Therefore in-situ stress is easy to restrain blasting damage. In same blasting parameters, compared to the hard rock, blasting in soft rock is more susceptible to the influence of in-situ stress.