高瓦斯特厚煤层高抽巷瓦斯抽采关键参数优化  

The Key Parameters Optimization of High Level Gas Drainage Roadway in Extra Thick and High-gas Coal Seams

作　　者：周西华[1,2] 周晓敏 郭晓阳[1,2] ZHOU Xihua;ZHOU Xiaomin;GUO Xiaoyang(School of Safety Science and Engineering,Liaoning Technical University,Fuxin 123000,China;Key Laboratory of Thermal Disaster and Prevention,Ministry of Education,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁阜新123000 [2]矿山热动力灾害与防治教育部重点实验室,辽宁阜新123000

出　　处：《矿业安全与环保》2018年第6期73-78,共6页Mining Safety & Environmental Protection

基　　金：国家自然科学基金项目(51274115)

摘　　要：下沟煤矿4301综放工作面布置在高瓦斯特厚煤层中,工作面瓦斯涌出量大,利用高抽巷瓦斯抽采技术在解决这一难题时会受到诸多参数影响,其中高抽巷与回风巷间的平距、与煤层顶板的垂距是最关键的参数。为寻求关键参数的最优值,以采动覆岩破坏规律为基础,利用FLUENT数值计算方法,模拟高抽巷的平距和垂距对采空区瓦斯抽采效果的影响,综合分析模拟结果和现场实测数据后对参数进行了优化。结果表明:当平距为20 m、垂距为30 m时,高抽巷抽采效果最佳; 4301综放工作面高抽巷按最佳参数布置后,高抽巷瓦斯抽采纯流量平均为43.93 m^3/min,最高可达54.75 m^3/min,占瓦斯涌出总量的75.6%,风排瓦斯量则由原来的14.03 m^3/min降至3.91 m^3/min,瓦斯抽采效果显著。The gas emission of4301fully mechanized working face in Xiagou Coal Mine in extra thick and high-gas seam is large,and gas drainage technology in high level gas drainage roadway is affected by many factors when solving this problem,there are two most critical parameters,namely the horizontal distance between the high level gas drainage roadway and the return air roadway,the vertical distance between the roof of the coal seam.In order to seek the optimal values of the key parameters,based on the law of overburden rock mass failure properties in mining,using the method of FLUENT numerical calculation to simulate the influence of the vertical distance and the horizontal distance on the drainage effects,obtaining the optimized parameters after comprehensive analysis of simulation results and field data.The results show that when the horizontal distance is20m and the vertical distance is30m,the effect of gas drainage in high level gas drainage roadway is the best;after the high level gas drainage roadway in4301fully mechanized working face arranged by the optimal value,the average gas extraction in high level gas drainage roadway is43.93m^3/min,its maximum can reach54.75m^3/min,accounts for about75.6%of the total gas emission,the amount of air exhaust from the original14.03m^3/min drops to3.91m^3/min,these data prove that the gas extraction effect is significant.

关 键 词：高瓦斯煤层 特厚煤层 综放工作面 高抽巷 数值模拟 

分 类 号：TD712.6[矿业工程—矿井通风与安全]