大直径钻孔抽采采空区瓦斯技术研究  

Gas Extraction Technology of Large Diameter Boreholes in Goaf

作　　者：邹永洺 王金成 ZOU Yongming;WANG Jincheng(China Coal Research Institute,Beijing 100013,China;Shenyang Research Institute,China Coal Technology&Engineering Group,Shenfu Demonstration Zone 113122,China;State Key Laboratory of Coal Mine Disaster Prevention and Control,Shenfu Demonstration Zone 113122,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工集团沈阳研究院有限公司,辽宁沈抚示范区113122 [3]煤矿灾害防控全国重点实验室,辽宁沈抚示范区113122

出　　处：《山西煤炭》2024年第4期50-57,71,共9页Shanxi Coal

基　　金：国家重点研发计划项目(2023YFB3211000);国家自然科学基金资助项目(52174229,52174230);辽宁省自然科学基金资助项目(2022-KF-23-03,2023-MS-355)。

摘　　要：以小回沟煤矿首采2201工作面作为研究对象,采用数值模拟和现场试验相结合的研究方法,选用大直径钻孔对采空区瓦斯进行抽采,达到采空区大流量、低负压瓦斯抽采的效果。首先基于采空区风流流动特征和多孔介质理论,运用数值模拟软件,对大直径钻孔抽采采空区瓦斯进行了数值模拟分析;其次,进行了大直径钻孔的封孔机理研究,确定了大直径钻孔封孔工艺参数,保证了大直径钻孔的瓦斯抽采量和瓦斯抽采浓度;再次,分析了不同直径瓦斯抽采管路、管路连接方式下瓦斯抽采负压和瓦斯抽采流量;最后,通过分析大直径钻孔距工作面不同位置时的瓦斯抽采浓度和瓦斯抽采纯流量,有效管控了工作面上隅角瓦斯,保证了上隅角瓦斯浓度不超限。Taking the No.2201 first mining face of Xiaohuigou coal mine as the research object,the comprehensive research method of numerical simulation and field test was adopted to extract gas from goaf by using large-diameter boreholes to achieve the gas extraction with large flow and low negative pressure in the goaf.Firstly,based on the wind flow features and porous media theory,numerical simulation analysis was carried out on the gas extraction in the gob area by large-diameter boreholes.Secondly,the sealing mechanism of large-diameter boreholes was studied,and sealing parameters of large-diameter drilling were determined to ensure the gas extraction volume and concentration from large-diameter boreholes.Thirdly,the negative pressure and flow rate of gas extraction were analyzed for different diameters of gas extraction pipelines and pipeline connection methods.Finally,the analysis of the gas extraction concentration and pure flow rate with large-diameter boreholes at different positions effectively controlled the gas in the upper corner of the working face,ensuring that the gas concentration in the upper corner did not exceed the limit.

关 键 词：大直径钻孔 采空区 数值模拟 瓦斯抽采 

分 类 号：TD712[矿业工程—矿井通风与安全]