双向聚能预裂爆破技术在沿空留巷中的应用研究

Study on application of bidirectional energy concentration pre-splitting blasting technology

针对金谷煤业9+10号煤层巨厚坚硬顶板不易垮落、沿空留巷围岩应力高、成巷难度大的问题,通过研究学习国内先进沿空留巷技术,提出了双向聚能预裂爆破切顶卸压关键技术,可提前在顶板岩层内设定的方向上进行深孔爆破切缝,提高切顶效果,保证了沿空留巷的成巷质量。

Aiming at the problems of the extremely thick and hard roof of No.9+10 coal seam in Jingu Coal Industry,the high surrounding rock stress of the gob-side entry retaining,and the difficulty in forming the roadway,the two-way technology of advanced roadway retaining along the country was studied.The key technology of pressure relief for pre-split blasting and cutting of concentrated energy pre-splitting can perform deep-hole blasting and cutting in advance in the direction set in the roof rock layer to improve the cutting effect and ensure the quality of the roadway remaining along the gob-side entry retaining.