突出危险煤层首采面采空区瓦斯抽采模拟分析  

Simulation Analysis of Goaf Gas Extraction for the First Working Face in Outburst Danger Coal Seam

作　　者：崔光俊 李桂臣[1] 孙元田[1] 

机构地区：[1]中国矿业大学深部煤炭资源开采教育部重点实验室,江苏徐州221116

出　　处：《煤矿安全》2016年第7期151-154,159,共5页Safety in Coal Mines

基　　金：国家自然科学基金面上资助项目(51574224);江苏省自然科学基金面上研究资助项目(BK20141130);中央高校基本科研业务费专项资金资助项目(2014QNB27)

摘　　要：分析了杨柳矿突出危险煤层10414首采工作面的地质特征,借鉴围岩裂隙场和采空区瓦斯流动场的变化规律,建立了CFD模型对采空瓦斯分布规律、埋管抽采效果、埋管与高位钻孔同时抽采效果进行模拟研究,并在10414工作面进行工程验证。结果表明:采空区瓦斯主要聚集在回风巷一侧,为判别采空区瓦斯高效抽采范围提供依据;50 m埋管与高位钻孔同时抽采时,上隅角瓦斯浓度降至0.5%,工作面不存在瓦斯超限现象;工程实践中可联合抽采40%的瓦斯,瓦斯纯量高达12.5 m^3/min,可见采空区瓦斯抽采在突出危险煤层应用中具有较好的实践效果。By analyzing the geologic features of 10414 working face in outburst danger coal seam,and referring to the changing laws of strata fractures and gas flow patterns,and based on the CFD model,gas distribution in goaf,buried pipe drainage,and drainage effect by the use of both buried pipe and high level borehole were simulated,and the engineering verification at 10414 working face was conducted. The results show that gas mainly gathers in one side of return airway and it provides evidence for judging the efficient range of goaf gas drainage. Gas concentration falls to 0. 5% at upper corner when buried pipe and high level borehole are mined simultaneously;and there is no phenomenon of gas over limit at working face; during the field practice,gas can be extracted 40% with joint drainage and the gas volume reaches 12. 5 m^3/ min,which indicates that it provides good practical effect for the application of goaf gas drainage theory on the first working face in outburst danger coal seam.

关 键 词：突出危险煤层 瓦斯超限 采空区 埋管 高位钻孔 ANSYS数值模拟 

分 类 号：TD712[矿业工程—矿井通风与安全]