Numerical Simulation of Cutting Blasting in Blind Shaft Based on SPH Particle Method

Aiming at the blasting effect of cutting hole in upward blind shaft, the compensation coefficient method is used to calculate the spacing of surrounding large empty holes and formulate the scheme. Smoothed particle hydrodynamics method (SPH particle method) is used for numerical simulation. The effect of surrounding empty holes and compensation coefficient on the blasting cavity and rock damage range are studied. The results show that when the hole spacing is constant, the explosion cavity area increases with the increase of compensation coefficient. When the compensation coefficient reaches 2.42, the blasting effect is the best and reaches the peak 0.54 m~2; Then the blasting effect reaches the limit, and the change of blasting cavity area tends to be stable. The rock damage range is limited due to the effect of explosives, and the overall change range is within 10%. The SPH particles in the simulation process can well simulate the rock movement state, empty hole filling and rock damage range in the blasting process. The simulation results are highly consistent with the cross-sectional area of the blasting cavity in the field test, indicating that the numerical simulation calculation has certain accuracy.