摘要
以新景矿3号煤层掘进工作面顺层水力造穴强化瓦斯抽采为工程背景,采用FLAC 3D数值模拟软件对顺层水力造穴的卸荷增透机制进行数值分析;研发出履带式钻冲一体化水力造穴装备,建立了高低浓度瓦斯抽采系统,并对顺层水力造穴技术在掘进工作面瓦斯抽采过程中的应用情况进行了系统性考察。数值分析结果表明,采用新技术后,造穴洞室四周煤体渗透率显著改善;造穴半径越大,造穴长度越长,煤体的卸荷增透区域效果越好。现场应用情况表明,采用新技术后,掘进工作面的瓦斯抽采效果显著改善,钻孔工程量降低了75.0%,平均瓦斯抽采纯量和平均瓦斯抽采浓度分别提高了4.6倍和1.5倍,巷道掘进过程中实测的钻屑指标K 1值和S值均显著降低。
Taking the gas drainage enhanced by hydraulic cavitation along seam in driving face of No.3 coal seam of Xinjing Mine as engineering background,the mechanism of stress-unloading and permeability-increasing by hydraulic cavitation along seam was analyzed numerically by FLAC 3D numerical simulation software.The crawler drilling-flushing integrated hydraulic cavitation equipment was developed,the high and low concentration gas drainage system was established,and the application of the technology of hydraulic cavitation along seam in gas drainage process of drving face was systematically investigated.The numerical analysis results show that the permeability of coal body around the cavern is significantly improved after using the new technology;the larger the radius of the cavern,the longer the length of the cavern,and the better the effect of unloading permeability region of coal body.The field application shows that after using the new technology,the gas drainage effect of the driving face is significantly improved,the amount of drilling engineering is reduced by 75.0%,the average gas drainage purity and average gas drainage concentration are increased by 4.6 times and 1.5 times,respectively,and the measured K 1 value and S value in the process of roadway driving are significantly reduced.
作者
王穗芳
张浩
王伟
袁丹萍
闫晓钰
吕文博
郭军伟
WANG Suifang;ZHANG Hao;WANG Wei;YUAN Danping;YAN Xiaoyu;LV Wenbo;GUO Junwei(College of Safety and Emergency Management Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Jinneng Holding Group Co.,Ltd.,Datong,Shanxi 037037,China;Shanxi Anbiao Inspection and Certification Co.,Ltd.,Taiyuan,Shanxi 030000,China)
出处
《中国煤炭》
2023年第6期28-36,共9页
China Coal
基金
国家自然科学基金资助项目(52104210)
山西省应用基础研究计划资助项目(20210302124350,202103021223116)
中国博士后科学基金资助项目(2022M710595)。
关键词
煤与瓦斯突出
松软低透煤层
水力造穴
数值分析
卸荷损伤
coal and gas outburst
soft and low-permeability coal seam
hydraulic cavitation
numerical analysis
stress-unloading damage
