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基于岩石断裂力学和爆炸力学原理,分析了起爆位置对深孔爆破效果的影响。并运用有限元软件ANSYS/LS-DYNA,对不同起爆位置下柱状药包在煤岩体中产生的应力场及其传播规律进行三维数值模拟研究。研究结果表明:起爆位置对深孔爆破有显著影响,孔口起爆形成的爆炸高能区指向煤岩体内部,有利于炮孔底部深部岩体的瞬时脆性断裂,孔底起爆在煤岩体内形成的应力有效冲量是孔口起爆1.5倍左右,有利于塑性区内应力集中区煤岩体的破碎和裂纹扩展。
Based on rock fracture mechanics and explosive mechanics, the effect of detonation position on deep-hole blasting is analyzed. The finite element software ANSYS / LS-DYNA was used to simulate the stress field and propagation of columnar kits in coal and rock mass under different initiation locations. The results show that the detonation position has a significant effect on the deep-hole blasting. The explosive high-energy zone formed by the orifice detonation points to the interior of the coal and rock mass, which is favorable for the instantaneous brittle fracture of the deep rock mass at the bottom of the blasthole. The effective impulse of impulse is about 1.5 times of the initiation of the orifice, which is in favor of the crushing and crack propagation of the coal and rock mass in the stress concentration area in the plastic zone.