井下大直径深孔爆破震动影响分析及对策

Analysis on Effect of Vibration Caused by Underground Large-diameter Long-hole Blasting and Its Countermeasures

井下大爆破作业,势必引起周边岩体大的震动,同时波及爆区周边地表和地下构筑物、井下工程等设施。为确定井下采场大爆破的规模,预测和掌握爆破震动的影响范围和破坏程度,对井下大直径深孔爆破不同爆破规模、同段起爆药量的爆破震动速度等参数进行理论计算预测,同时开展现场爆破监测试验,通过对预测及试验结果进行讨论分析得出V合=84.7162(Q1/3/R)1.44964,并提出相应安全保障措施,为井下大直径深孔爆破崩矿作业的科学性及安全稳定性提供了必要的技术支撑。

Underground bulk blasting is bound to cause vibration of the circumjacent rock mass, and simultaneously affects sur- rounding surface and underground structures as well as under- ground engineering. In order to determined the scale of under- ground bulk blasting, predict and know the effecting area and de- structive power of vibration caused by underground large - diam- eter long - hole blasting, theoretical calculation of some parame- ters such as blasting vibration velocity and so on for different blasting scales and different charges of one section was made, site blasting and monitoring experiments were carried out. Based on the discussion and analysis of the predicted and measured re- sults, a formula for the attenuation of blasting vibration resultant velocity （ V合 = 84. 7162 （ Q1/3/R ） 1.44964） was presented, and some appropriate safety measures were brought forward. The study provided necessary technical support for the scientific and safe mining by large - diameter long - hole blasting.