高瓦斯近距离煤层采空区卸压瓦斯大直径钻孔抽采试验研究  

Experimental Study on Pressure Relief Gas Extraction of Goaf with Large Diameter Borehole in High Gas Close Distance Coal Seams

作　　者：邵国安 邹永洺 SHAO Guoan;ZOU Yongming(Shanxi Xiaohuigou Coal Mine Co.,Ltd.,Qingxu 030400,China;China Coal Technology and Engineering Group Shenyang Research Institute,Fiishun 113122,China;State Key Laboratory of Coal Safety Technology,Fiishun 113122,China)

机构地区：[1]山西小回沟煤业有限公司,山西清徐030400 [2]煤科集团沈阳研究院有限公司,辽宁抚顺113122 [3]煤矿安全技术国家重点实验室,辽宁抚顺113122

出　　处：《煤矿安全》2020年第9期6-10,共5页Safety in Coal Mines

基　　金：国家重点研发计划资助项目(2018YFC0807900);中国煤炭科工集团有限公司科技创新基金资助项目(2018-MS-022);辽宁省自然科学基金指导计划资助项目(20180551093)。

摘　　要：以小回沟煤业近距离煤层开采采空区瓦斯治理为工程背景,采用理论分析和现场试验相结合的方法,开展了近距离煤层采空区卸压瓦斯大直径钻孔抽采试验研究;对大直径钻孔采空区卸压瓦斯抽采原理进行了分析,并在2201首采工作面进行了现场试验。试验结果表明:1个大直径钻孔抽采影响范围为30~50 m,1个大直径钻孔的抽采纯流量相当于580个小直径对穿孔抽采纯流量,大直径钻孔累计抽采瓦斯纯量为701120.67 m^3,平均瓦斯抽采浓度为2.24%,平均混合抽采流量为166.3 m^3/min,上隅角瓦斯最大瓦斯浓度0.67%,工作面最大日产量9370 t,保证了工作面初次来压阶段的工作面采空区瓦斯治理。Based on the engineering background of gas control in the close distance coal seams goaf in Xiaohuigou Coal Mine,the experimental study on the pressure relief gas extraction of goaf with the large diameter borehole in close distance coal seams is carried out combined with the theoretical analysis and field test,and the principle of the large diameter borehole extraction pressure relief gas of the goaf was studied,the field tests were carried out in the 2201 first working face.The field results show that the influence range of one large diameter drilling is 30-50 m,the net flow of a large diameter borehole is equivalent to that of 580 small diameter holes,the total amount of gas extraction is 701120.67 m^3,the average gas extraction concentration is 2.24%,the average mixed extraction flow is 166.3 m^3/min,the maximum gas concentration of the upper corner is 0.67%,the maximum daily output of the working face is 9370 t,which can ensure the gas control of the goaf in the initial pressure stage of the working face,and provides a reference for the gas control of the goaf under similar conditions.

关 键 词：近距离煤层群 采空区卸压瓦斯 大直径钻孔 瓦斯抽采 小直径钻孔 

分 类 号：TD712[矿业工程—矿井通风与安全]