深孔聚能爆破坚硬顶板弱化试验研究

针对坚硬难垮落顶板控制问题，以通化矿业（集团）有限责任公司松树镇煤矿为例，根据聚能流侵彻、应力波拉伸和爆生气体气楔作用定向切割使顶板弱化的原理，在分析聚能爆破裂隙起裂扩展条件基础上，设计了深孔聚能爆破顶板弱化方案，并结合现场条件对爆破孔参数进行优化。试验结果表明，聚能爆破弱化了坚硬顶板，缩小了回采工作面初次来压步距，使顶板冒落面积减少近30%，为解决采空区顶板大面积悬顶提供了技术途径。

Experimental research of deep-hole cumulative blasting in hard roof weakening

In view of the hard and stable roof control problems，take Songshuzhen Coal Mine of Tonghua Mining (Group) Co.，Ltd.for example.According to the directional cut roof weakening principle under the effect of cumulative jet penetration，stress wave tension and explosive gas wedge，based on the analysis of cumulative blasting fractures’ initiation and extension conditions，roof weakening scheme of deep hole cumulative blasting was designed and blast hole parameters were optimized combined with field conditions.The experiment results show that cumulative blasting weakens the hard roof，reduces stope face first weighting interval and roof caving area which decreased by about 30%，and provides a technological approach to solve large area hanging roof in golf.