顶板千米定向钻孔在高瓦斯煤层群瓦斯抽采中的应用  

Application of Roof Kilometer Directional Drilling in Gas Extraction of High Gas Coal Seams Group

作　　者：谢小平 耿耀强[2] XIE Xiao-ping;GENG Yao-qiang(College of Mining and Civil Engineering,Guizhou Liupanshui Normal College,Liupanshui 53004,China;School of Mines,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]六盘水师范学院矿业与土木工程学院,贵州六盘水553004 [2]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《煤炭工程》2019年第12期101-105,共5页Coal Engineering

基　　金：国家自然科学基金资助(50504014);贵州省煤炭绿色发展2011协同创新中心(黔教合协同创新字[2016] 02号)

摘　　要：针对低透气高瓦斯近距离煤层群开采邻近煤岩层大量卸压瓦斯涌入工作面的问题,采用理论分析和数值模拟相结合的方法,分析了工作面顶板裂隙与卸压煤层瓦斯富集的关系,模拟了工作面顶板采动裂隙分布与演化规律;提出了顶板千米定向钻孔抽采采空区上部集聚卸压瓦斯的技术方案;并结合现场14301工作面的实际条件,确定了顶板千米定向钻孔布置的技术参数。现场应用表明:在顶板千米钻场抽采瓦斯观测期间内,瓦斯抽采浓度始终保持在25%以上,最高达到80%,瓦斯抽采纯量在2.0~3.0m^3/min之间,并且有效抽采浓度的持续时间长,取得了良好的瓦斯抽采效果。In order to solve the problem of low-permeability and high-gas short-distance coal seam group mining,and a large amount gas inrush into the working face from adjacent pressure-relief coal seam,theoretical analysis and numerical simulation are carried out to analyze the working face roof fissure and the relationship between the pressure relief seam gas enrichment,and simulate the mining working face roof fracture distribution and evolution law.The extraction technical scheme is put forward for pressure relief gas gathering at the upper part goaf using kilometer directional drilling in the roof,and technical parameters of the roof drilling are determined combining with the actual conditions of 14301 working face.Field application shows that during the observation period of gas extraction in the roof kilometer drilling field,the concentration of gas extraction is up to 80%and maintains over 25%.The pure amount of gas extraction is between 2.0~3.0 m^3/min,and the effective extraction concentration lasts long,achieving favorable gas extraction effect.

关 键 词：低透气性 高瓦斯 煤层群 千米定向钻孔 瓦斯抽采 

分 类 号：TD823[矿业工程—煤矿开采]