深孔爆破巷道动态应力比评价安全判据

Research on safety criterion evaluation of dynamic stress ratio for deep hole blasting in tunnel

为研究爆破振动波在石英岩中的传播规律,以建德大岩山石英矿阶段运输巷道为依托,通过对采场深孔爆破时阶段运输巷道底板的速度—时间信号的采集,结合萨道夫斯基公式,以动力应力比评价为依据,判断爆破振动对巷道稳定性的影响,结果发现在钻孔孔径90 mm、单响药量30.5 kg、爆心距15.7 m的条件下,巷道围岩不会发现明显损伤。

In order to study the propagation law of blasting vibration waves in quartzite, based on the transportation lane of the Jiande Dayanshan quartz mine stage, through the collection of the speed-time signal of the floor of the roadway during the deep hole blasting of the mining stop, combined with the Sadowski formula, at the same time, through the basis of dynamic stress ratio evaluation,judging the impact of blasting vibration on the stability of the roadway,it was found that under the existing blasting parameters, no obvious damage will be found in the surrounding rock of the roadway.