基于冲击启动理论的深孔区间爆破疏压技术

DREDGING TECHNOLOGY OF PRESSURE WITH DEEP-HOLE INTERVAL BLASTING BASED ON THEORY OF ROCK BURST START-UP

通过分析巷道冲击地压启动机制,采用数值模拟方法研究巷帮集中应力分布的爆破效应,提出基于冲击启动理论的深孔区间爆破疏压方法。研究表明:巷帮深孔爆破的区间应为冲击启动区,否则将起到负面作用;加大巷帮煤壁支护强度以疏、降集中应力是有限的;深孔区间爆破疏压方法,一方面疏、降冲击启动区应力或能量集中程度,阻止冲击启动环节发生,另一方面迫使率先冲击启动的区域向煤壁深部迁移,并增加疏压区消耗冲击地压启动后的总能量,降低能量释放速度。研究结果在现场取得较好的应用效果。

By analyzing the mechanism of rock burst start-up, the blasting effect of the concentrated stress distribution in the roadway is studied by numerical simulation methods; and the dredging method of pressure with deep-hole interval blasting based on theory of rock burst start-up is proposed. The research results show that： （1） The interval of deep-hole blasting in roadway should be the area of rock burst start-up, otherwise it will play a negative role. （2） It is limited to dredge and debase concentrated stress by increasing intension of roadway support. （3） On one hand, the dredging method of pressure with deep-hole interval blasting can dredge and debase the degree of concentrated stress or energy of the area of rock burst start-up, thus the rock burst start-up step can be prevented. On other hand, it let the area of rock burst start-up firstly move to the deep coal wall; and the total energy which is consumed by rock burst start-up in dredging pressure area increases, but the energy release speed reduces. The good effect of application the research results to field engineering is got.