【摘要】 下山巷道掘进过程中,巷道岩石爆破为含水爆破作业。利用爆破动力学和岩石力学理论,通过对爆破装药的合理简化,深入研究了含水裂隙岩体中的爆破地震效应及飞石抛掷特性。针对爆破震动特性进行了理论计算,并和测试结果进行了对比,计算结果与现场实践吻合较好。结果表明:随炮孔含水量的增加,炮孔壁质点速度呈增大趋势,爆源处爆破地震效应相对略有增强,且传播较远,但是震动速度的增长趋势比无水爆破时缓慢,距爆源远处地震效应减弱。由此可见,岩体中含水爆破能有效地降低爆破地震效应,对预防和减少爆破灾害具有一定的指导作用。更多还原

【Abstract】 In the driving process of dip entries,the blasting operation in headings is commonly the rock blasting with waters.In the paper,the effect of blasting vibration and the rock throwing characteristics in the water-bearing and cracked rock mass were discussed deeply by making use of the theories of blasting dynamics and rock mechanics.Especially,the blasting vibration characteristics were calculated,and contrasted with the tested results.The calculated results held agood coincidence with the engineering practice.The results showed that with the increase of water content in blast hole the particle velocity of hole wall tended to increase.The effect of blasting vibration at explosion source was slightly enhanced and the transmit distance was farther,but the tendency of vibration velocity increase was slower than that of blasting without water,and the seismic effect of the place away from the explosion source was weakened.Thus,it can be seen that blasting containing water in cracked rock mass can effectively reduce the effect of blasting vibration.更多还原