钻屑法检验深孔爆破卸压技术效果

冲击地压的发生与工作面前方煤体应力场的分布密切相关,可以采用深孔爆破卸压技术来改变巷道附近围岩的应力场分布形式及煤岩体的物理力学性质,降低巷道附近围岩的受载应力,使得巷道附近煤岩体的冲击倾向性指标及冲击临界载荷降至临界值以下,从而避免冲击地压的发生,利用钻屑量和钻屑粒度对深孔爆破卸压效果进行检验。研究表明:钻屑量与钻屑粒度能够有效地反映工作面前方煤体应力分布及转移情况,能够有效地检测爆破卸压效果,为深孔爆破卸压防治冲击地压技术的效果检验提供一种检测技术。

Drilling Cuttings Method Tests Pressure Releasing Technique that Effects of Deep-hole Blasting

The occurrence of rock burst is closely related to the distribution of the coal stress field in front of the working face,deep hole blasting pressure relief technology can be used to change the distribution of surrounding rock stress near the roadway and physical and mechanical properties of coal and rock,to reduce the load stress of surrounding rock near roadway,it makes the targets of burst potential and impact compressive strength drop below the critical value,so as to avoid the occurrence of rock-burst,use drilling cuttings and size of cuttings particle to test effect of the unloading blast in deep hole. The research shows that the amount and particle size can effectively reflect the stress distribution and transfer of coal in front of the working face,it can effectively detect the effect of unloading blasting and provide a detection technology for the effect test of deep hole blasting pressure relief technology.