孔内微差爆破数值模拟及试验研究

Numerical Simulation and Experiment Research of in In-hole Microsecond Blasting

结合数值模拟及现场试验,对孔内微差爆破进行了分析研究。模拟了不同间隔比例的空气间隔装药爆破及10～50ms微差时间的孔内微差爆破,结果表明:相比连续耦合装药,采用空气间隔装药方式减震效果显著,且减震率高于药量减小的比例,在30%间隔比例下可达约36.5%;在间隔装药的基础上进一步采用孔内微差爆破,相比上下段同时起爆最大可以进一步减小18.09%的爆破振动强度。数值模拟及现场试验均表明,孔内微差时间超过30ms后减震效果即保持稳定。

Abstract： Based on numerical simulation and field experiment, in-hole millisecond blasting was studied. Both air deck charge blasting with different deck length and in-hole millisecond blasting with 10-50 ms delay time were simulated. The study results showed that： compared with continu- ous charge blasting, air deck charge blasting can reduce vibration effectively, of which the vibration reduction ratio is higher than that of the charge reduction blaseting;The vibration reduction ratio is 36.5% when the deck ration is 30% ; When using in-hole millisecond blasting based on air deck charge, the vibration strength can be further reduced by 18.09% compared with the condition that two sections charge being detonated in the same time. The results of both numerical simulation and field experiment showed that the vibration reduction effect remained stable when the delay time of in-hole millisecond blasting was over 30 ms. remained stable.