官地矿切顶卸压沿空留巷聚能爆破现场试验研究

Experimental Research on Blasting Parameters of Roof Cutting and Pressure Relieving Gob Side Entry Retaining in Guandi Coal Mine

为了确定110工法的合理爆破参数并实现安全沿空留巷的目的,以官地矿中厚煤层12605工作面为研究背景,采用理论分析和现场研究相结合的方法,对比分析了三种不同装药结构条件下的试验爆破效果。结果表明,在爆破孔深7m、炮孔间距500mm的情况下,由孔顶到孔底依次为"4+3+2+1"装药方式对顶板破坏严重,"3+2+2+1"的装药方式切缝效果较差。而采用"3+3+2+1"的装药方式,爆破孔内裂缝明显发育,裂缝率达到87%。满足留巷设计要求,现场应用效果良好。

In order to explore reasonable blasting parameters of 110 mining method and achieve the goal of successful and safe roadway retaining,taking the medium-thick seam 12605 working face of Guandi Coal Mine as the research background,three different charging structures were compared and analyzed by means of theoretical analysis and field research. The test blasting effect under the condition. The results show that under the condition of 7 m blasting hole depth and 500 mm blasting hole spacing,the roof is seriously destroied with 4+3+2+1 charge( from the top to bottom of the hole),and the slitting effect is poor with 3+2+2+1 charge. With the 3+3+2+1 charging method,the cracks in the blasting hole develop obviously,and the crack rate reaches 87%,satisfying the design requirements of retaining roadway,and the field application effect is good.