高瓦斯突出煤层原位充填沿空留巷技术研究  

Study on gob-side entry retaining technology of in-situ filling in high gassy outburst coal seam

作　　者：刘雨涛 李其振 王鹏伟 LIU Yutao;LI Qizhen;WANG Pengwei(Guizhou Nengfa Gaoshan Mining Co.,Ltd.,Bijie 551500,China;College of mines,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]贵州能发高山矿业有限公司,贵州毕节551500 [2]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《矿业安全与环保》2020年第1期45-50,共6页Mining Safety & Environmental Protection

摘　　要：为解决高瓦斯煤层巷道掘进过程中易出现瓦斯突出、工作面回采瓦斯浓度频繁超限、工作面采掘接替紧张等难题,以高山煤矿1902工作面为工程背景,研究了高瓦斯突出煤层原位充填沿空留巷技术。通过理论分析选定预制混凝土砌块墙原位充填支护方式,理论计算出充填隔离墙体留设宽度为0.72~1.68 m;运用FLAC^3D数值模拟软件分析了0.8、1.2、1.6 m共3种不同墙体宽度条件下巷道围岩塑性区、巷道应力及位移分布规律,并在1902工作面进行现场试验与矿压监测。研究结果表明:随着充填隔离墙体留设宽度的增加,墙体切顶能力增强,巷道围岩应力、位移变形量减小,最终确定墙体合理留设宽度为1.2 m。现场监测留巷顶底板平均总移近量基本维持在250 mm±50 mm,两帮平均总移近量维持在200 mm±20 mm,从而检验了该技术的可行性,可为类似条件煤矿应用沿空留巷技术提供借鉴。In order to solve the problems such as gas outburst in roadway tunneling,frequent overlimit of gas concentration in mining face,and replacement tension in mining face in high gassy coal seam,taking 1902 working face of Gaoshan Coal Mine as the engineering background,the gob-side entry retaining technology of in-situ filling in high gassy outburst coal seam was studied.Theoretical analysis was used to determine the in-situ filling and supporting mode of precast concrete block and get the width of filling wall was in the range from 0.72 m to 1.68 m;by using FLAC^3D numerical software,the surrounding rock plastic zone,stress and displacement distribution law of roadway under different width of isolation wall were analyzed under conditions of 0.8 m,1.2 m,1.6 m wide walls,and the field test and mine pressure monitoring were conducted in 1902 working face.The results show that:with the increase of the width of the filling separation wall,the roof cutting ability of the wall increases,the stress and displacement deformation of surrounding rock of roadway decreases,and the reasonable width of the wall is determined to be 1.2 m.The total average displacement of the roof and floor of the retaining entry is basically maintained at 250 mm±50 mm,and the average total displacement of the two sides is maintained at 200 mm±20 mm,which verifies the feasibility of the technology and provides a reference for the application of gob-side entry retaining technology in coal mines under similar conditions.

关 键 词：高瓦斯突出煤层 砌块隔离墙 合理宽度 预制混凝土砌块 原位充填 沿空留巷 矿压观测 

分 类 号：TD822[矿业工程—煤矿开采] TD32[矿业工程—矿山开采]