文献类型：期刊文献

英文题名：Effect evaluation of pressure relief and gas drainage of hydraulic punching in short-distance coal seam group with the risk of outburst [近距离突出煤层群水力冲孔卸压瓦斯抽采 及效果评价研究]

作者：Cao Z. Wang E. He X. Wang H. Liu Q. Zhang G. Luo F. Wang C. Xu Y.

通信作者：Wang, E.[1,4]

机构：[1]Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;[2]Institute of Mining Engineering, Guizhou Institute of Technology, Guiyang, Guizhou 550003, China;[3]Guizhou Administration of Coal Safety, Guiyang, Guizhou 550004, China;[4]School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;[5]School of Civil and Resources Engineering, University of Science & Technology Beijing, Beijing, 100083, China;[6]Guizhou Panjiang Coal and Electricity Group Co Ltd, Guiyang, Guizhou 550081, China;[7]Guizhou Songhe Coal Mine Development Co Ltd, Panzhou, Guizhou 553526, China

第一机构：Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

年份：2021

卷号：38

期号：3

起止页码：634-642

外文期刊名：Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering

收录：Scopus(收录号：2-s2.0-85108384427)

语种：英文

外文关键词：Effective influence radius; Gas-solid coupling model; Hydraulic punching; Pressure relief and gas drainage; Short-distance coal seam group

摘要：In order to effectively evaluate the effect of pressure relief and gas drainage of hydraulic punching, based on elastic mechanics, seepage mechanics and Klinkenberg effect, a solid-gas coupled model containing deformation equations of coal and rock, equations of gas migration and evolution equations of porosity and permeability was established, the spatio-temporal evolution law between diameter of borehole with hydraulic punching and gas pressure in the coal seam around borehole with hydraulic punching was simulated and analyzed with COMSOL Multiphysics, and the theoretical calculation formula of effective influence radius of gas extraction in short-distance coal seams group with the risk of outburst was established based on the law of conservation of mass, which was applied in SongheCoalmine. Studies have shown that, 1) The gas drainage changes of each coal seam in the short-distance coal seams group are basically synchronous after hydraulic punching. The effect of gas extraction and influence radius increase with the increase of borehole size of hydraulic punching. 2) The effect of pressure relief and gas drainage in the coal seam are significantly improved after hydraulic punching according to the field test result. The closer it is to the borehole of hydraulic punching, the better the effect of pressure relief effect and permeability improvement is, so are the concentration and flow rate of gas extraction. According to the comparison results of inspection boreholes, the effective influence radius of pressure relief and gas drainage are 4-5m on the 70 days after hydraulic punching. 3) The results are similar to those of numerical simulation after substituting field data into the effective influence radius theoretical formula of gas extraction in short-distance coal seam group, which shows the feasibility of the theoretical formula. The research results have good guiding significance for the gas control and effect evaluation of the short-distance coal seams group with low permeability. ? 2021, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.