In order to determine the reasonable air-deck length in underground vertical deep-hole blasting,the internal distribution function of impact pressure on hole wall with different air-deck length in multi-stage air deck blasting was analyzed based on the detonation wave theory.According to the Mises criterion,the reasonable reference values of air-deck length were obtained for different kinds of rock,which was verified by numerical simulation and on-site blasting test.The results show that the impact pressure on the hole wall of the air deck drops abruptly from both sides to the center along the axis of the hole,but increases slightly around the midpoint,and the pressure distribution presents a symmetrical W-shaped curve,with much higher values on two sides,lower in the middle section,and slightly higher around the center.
关键词
深孔爆破/轴向不耦合装药/空气间隔/孔壁冲击压力/数值模拟
Key words
deep-hole blasting/axial decoupled charge/multistage air deck/impact pressure on hole wall/numerical simulation
维普
万方数据