Numerical Simulation of Orepass Choking-up Treatment Adopting Blasting Method

Numerical simulation studies on blasting in ore-pass with charge both 250?kg and 500?kg are carried out. Adopting fluid-solid coupling method, the whole process from detonating to shockwave transference in the ore-pass reappears. The air shockwave's attenuation, chocking-up surface pressure and ore-wall press are analyzed. The results show that the biggest pressure of ore-wall happened at 0.43?m height, and the peak pressure are 167.0?MPa (250?kg) and 341.1?MPa (500?kg) individually. The choking-up zone's stress state from center to edge represents transition from press to strain, and the strain/press stress peak values are 9.2/4.8?MPa (250?kg) and 17.2/12.5?MPa (500?kg). The shockwave's attenuation values got from both experiential formula and simulation are compared, the experiential formula values are 2.54-3.49 times of the simulation results.