摘要
随着煤层开采深度的增加,瓦斯灾害逐渐成为影响我国急倾斜煤层开采矿井安全生产的重要影响因素;同时,由于急倾斜特厚煤层地质条件与开采工艺的特殊性,导致其水平分层工作面瓦斯治理难度增大。为此,以乌东煤矿+575 m水平43#煤层西翼工作面为工程背景,对其工作面瓦斯涌出来源进行分析并对瓦斯涌出量进行预测;提出了预抽顺层长钻孔、采空区埋管抽采、顶板走向高位钻孔抽采、下部煤体卸压拦截抽采钻孔互相结合的瓦斯立体化抽采工艺。研究结果表明:+575 m水平43#煤层西翼工作面瓦斯主要来源于开采分层与下部煤体卸压瓦斯涌出;工作面的瓦斯预抽率为42.1%,抽采达标;工作面回采过程中进风巷瓦斯涌出量维持在0.5 m 3/min,回风巷瓦斯涌出量呈现降低趋势,回风隅角瓦斯浓度位于合理范围之内,回采过程中瓦斯抽采效果较为理想。
With the increase of the mining depth of coal seams,gas disasters have gradually become an important factor affecting mine safety production in the mining of steeply and ultra-thick coal seam in China;at the same time,due to the special geological conditions of the steeply inclined and extra-thick coal seam and the particularity of the mining process,the difficulty of gas control in its horizontal slicing working face increases.Therefore,based on the west working face of No.43 coal seam at +575 m level in Wudong Coal Mine,the source of gas emission from the working face was analyzed and the amount of gas emission was predicted;the gas stereoscopic drainage technology combining pre-drainage of long borehole along coal seam,buried pipe drainage in goaf,high-level borehole drainage to roof,and lower coal pressure relief interception drainage drillings were proposed.The results show that the gas in the west working face of No.43 coal seam at +575 m level mainly comes from the gas emission of the slicing working face and the lower coal pressure relief;the pre-drainage rate of gas in the working surface is 42.1%,and the drainage reaches the standard;in the process of stoping in the working face,the gas emission in the air inlet lane is maintained at 0.5 m 3/min,and the gas emission in the return air lane has a decreasing trend,the gas concentration in the corner of return air is within a reasonable range and the gas extraction effect is relatively ideal during the mining process.
作者
郑三龙
范酒源
王刚
王恩茂
ZHENG Sanlong;FAN Jiuyuan;WANG Gang;WANG Enmao(Wudong Coal Mine,Shenhua Xinjiang Energy Co.,Ltd.,Urumqi 830002,China;College of Mining and Safety Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Key Laboratory of Mine Disaster Prevention and Control of the Ministry of Education,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《矿业安全与环保》
北大核心
2020年第6期69-74,共6页
Mining Safety & Environmental Protection
基金
2018年自治区引进高层次人才天池百人计划(新人社函[2019]39号)。
关键词
急倾斜特厚煤层
水平分层工作面
瓦斯涌出量预测
瓦斯抽采
立体化
效果考察
steeply and ultra-thick coal seam
horizontal slicing working face
prediction of gas emission
gas drainage
stereoscopic
effect investigation
