密集钻孔切顶卸压沿空留巷技术研究与应用  

On the Technology of Dense Drilling to Cut Roof and Relieve Pressure Along the Goaf and Its Application

作　　者：覃疏捷 张自政 徐世强 罗佳豪 孙旭鹏 QIN Shujie;ZHANG Zizheng;XU Shiqiang;LUO Jiahao;SUN Xupeng(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201

出　　处：《矿业工程研究》2024年第4期26-32,共7页Mineral Engineering Research

摘　　要：切顶参数是密集钻孔切顶卸压沿空留巷中需要考虑的核心问题.文章以大鸿煤矿11601工作面的沿空留巷工程为背景,综合运用理论分析与数值模拟的方法,开展密集钻孔切顶卸压沿空留巷技术研究.首先采用理论计算确定切顶高度、角度、间距和钻孔直径等关键参数;其次基于现场生产条件,建立3DEC数值计算模型,模拟分析密集钻孔切顶参数对沿空留巷围岩变形、应力传递、塑性区发育特征的影响.结果表明:通过合理优化切顶参数,可以有效阻断采空区应力的传递路径,显著降低坚硬悬顶断裂对巷道围岩的扰动,从而改善沿空留巷围岩的应力环境.矿压监测结果表明:在工作面后方约100 m处,顶底板最大移近量小于200 mm,巷道两帮最大收缩量不超过100 mm,11601工作面实现留巷围岩稳定控制.Cutting parameters in dense drilling for top coal caving,especially in goaf pressure alleviation,are crucial.This study investigates the gob-side entry retaining technology applied to the 11601 working face of the Dahong Coal Mine.Using a combination of theoretical analysis and numerical simulation,the research explores dense borehole roof cutting and pressure relief techniques for effective gob-side entry retaining.Firstly,theoretical calculations determine key parameters,with cut height,angle,spacing,and drill hole diameter included.Secondly,a 3DEC numerical model is developed based on field production conditions to simulate and analyze how dense borehole roof cutting parameters influence the surrounding rock deformation,stress transfer,and plastic zone development in gob-side entry retaining.The results demonstrate,optimizing roof-cutting parameters effectively blocks stress transfer in the goaf,minimizes the impact of hard roof fractures on surrounding roadway rock,and enhances the stress environment for gob-side entry retaining..Rock pressure monitoring confirms approximately 100 meters behind the fully mechanized working face.With roof and floor convergence under 200 mm and roadway contraction under 100 mm on both sides,the 11601 working face has achieved stable control of the surrounding rock in gob-side entry retaining.

关 键 词：沿空留巷 密集钻孔 切顶卸压 围岩控制 

分 类 号：TD353[矿业工程—矿井建设]