摘要
为了解决目前采用的直立型地面钻井抽采范围小、工作面所需钻井数量多及瓦斯流量和浓度偏低的问题,基于屯兰矿12507工作面Ⅱ段工程地质情况,提出地面“L”型钻井提高瓦斯抽采效率的理论和实践研究。通过PFC3D颗粒流离散元数值模拟软件对工作面覆岩采动影响进行模拟,得到采动影响下的覆岩结构、裂隙和孔隙率变化。研究结果表明:屯兰矿12507工作面Ⅱ段的垮落带高度为15.87 m,裂隙带高度为49.46 m,采空区上方15~50 m、沿倾向方向距离采空区边界20~100 m的范围内裂隙较发育,孔隙率高且稳定。在屯兰矿12507工作面Ⅱ段进行工程实践,得到地面“L”型钻井在抽采效率、工作面上隅角瓦斯治理及采空区瓦斯有效利用方面优于普通地面钻井抽采,抽采系统工作149 d瓦斯抽采浓度平均为52.52%,抽采纯量平均为9.48 m 3/min,上隅角瓦斯浓度平均为0.21%,降低了矿井瓦斯灾害出现的风险并提高了煤层气的利用。
In order to solve the problems of small drainage range,large number of drilling required for working face and low gas flow and concentration in the vertical ground drilling currently used,the theoretical and practical research on improving the gas drainage efficiency by ground L-type drilling was carried out based on the engineering geological conditions ofⅡsection in 12507 working face of Tunlan Mine.The PFC3D particle flow discrete element numerical simulation software was used to simulate the mining influence of overburden rock in working face,and the change of overburden structure,fracture and porosity under the mining influence were obtained.The results showed that the height of caving zone was 15.87 m and the height of fractured zone was 49.46 m in theⅡsection of 12507 working face in Tunlan Mine.The fractures were developed in the range of 15~50 m above the goaf and 20~100 m from the goaf boundary along the dip direction,and the porosity was high and stable.The engineering practice was carried out in theⅡsection of 12507 working face in Tunlan Mine,and it was obtained that the ground L-type drilling was better than the ordinary ground drilling drainage in terms of drainage efficiency,gas control in the upper corner of working face and effective utilization of gas in the goaf.The average gas drainage concentration of the drainage system in 149 days was 52.52%,the average pure amount of drainage was 9.48 m 3,and the average gas concentration in the upper corner was 0.21%,which reduces the risk of mine gas disasters and improves the utilization of coalbed methane.
作者
张小龙
王飞
刘红威
高瑞青
高亚斌
李子文
贺志宏
刘振明
郝亚兵
ZHANG Xiaolong;WANG Fei;LIU Hongwei;GAO Ruiqing;GAO Yabin;LI Ziwen;HE Zhihong;LIU Zhenming;HAO Yabing(School of Safety and Emergency Management Engineering,Taiyuan University of Technology,Taiyuan Shanxi 030024,China;Shanxi Coal Mine Safety Graduate Education Innovation Center,Taiyuan Shanxi 030024,China;School of Civil,Mining and Environmental Engineering,University of Wollongong,New South Wales 2500,Australia;Xishan Coal and Electricity Group Co.,Ltd.,Taiyuan Shanxi 030000,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2022年第10期56-61,共6页
Journal of Safety Science and Technology
基金
2018年度山西省重点研发计划项目(20183D31053)
山西焦煤集团公司重大技术攻关项目(201812xs06)。
关键词
地面“L”型钻井
瓦斯抽采
数值模拟
采动影响
覆岩结构
ground L-type drilling
gas drainage
numerical simulation
mining influence
overburden structure
