大采高厚坚硬顶板爆破切顶卸压技术的应用研究

Study and Application of Blasting Roof Cutting Pressure Relief Technology of Large MiningHeight Thick Hard Roof

针对端氏煤矿3113回风巷存在初次垮落步距大、巷道变形大、支护难度大等问题,对3113回风巷实施了爆破切顶卸压,确定了切顶角度、切顶卸压深度、孔间距等主要参数。实践结果表明:爆破后煤柱帮、顶板、煤壁、底板最大变形量为169.4 mm、122.5 mm、113.3 mm、74.5 mm,巷道围岩变形量整体较小,爆破切顶卸压效果显著。

In view of the problems of large initial collapse step distance,large roadway deformation,and high support difficulty in the 3113 return air roadway of Duanshi Coal Mine,blasting roof cutting pressure relief is implemented for the 3113 return air roadway,and main parameters such as roof cutting angle,roof cutting pressure relief depth,hole spacing and so on are determined.The practical results show that the maximum deformation amount of the coal pillar side,roof,coal wall,and floor after blasting is 169.4 mm,122.5 mm,113.3 mm,and 74.5 mm.The overall deformation amount of the roadway surrounding rock is relatively small,and the blasting roof cutting and pressure relief effect is significant.