Numerical Simulation of Stress Wave Propagation with Straight and Wedge Cut Blasting

For the sake of revealing the mechanism of straight and wedge cut blasting, the 8-borehole rectangle cut models were set up. The propagation, superposition and reflection process of stress wave were simulated. The results manifested that the stress was strengthened significantly at the bottom half part along borehole density direction. The result showed that the stress superposition area represented square-shaped area with straight cut blasting, while that of wedge cut presented strip-shaped area. These phenomena illustrated that the breakage ability of borehole bottom was improved with wedge method.