Wang Lei, Li Jiangtao, Fan Jiuyuan, Sun Chuyan, Zhang Jinghan, Zhang Jiuling
School of Emergency Management and Safety Engineering, North China University of Science and Technology, Tangshan, Hebei 063210, China.
Key Laboratory of Mining Development and Safety Technology, Tangshan, Hebei 063210, China.
ACS Omega. 2025 Jan 16;10(3):3090-3100. doi: 10.1021/acsomega.4c09962. eCollection 2025 Jan 28.
Gas gush in goaf leads to gas accumulation in local areas, which not only easily leads to excessive gas concentration in the corner of the working surface but also may induce gas explosion, which seriously threatens the safety of mine production. In order to study the influence of gas extraction technology on gas migration in gobs, a gob model is established based on experimental parameters, and the application effect of buried pipe extraction and high level borehole extraction technology in high gas gobs is analyzed by numerical simulation software (Fluent). The results show that (1) buried pipe extraction will cause the gas concentration in the gob to increase along the strike and dip direction, and the negative pressure at the extraction mouth will reduce the gas concentration at the pipe mouth and the gas concentration near the upper corner. (2) The best technical parameters of buried pipe extraction are buried pipe length 30 m, pipe diameter 0.3 m, and extraction flow rate 80 m/min. (3) When the vertical distance of the upper borehole is 18.5 m, the horizontal distance is 10 m, and the spacing of the borehole is 8 m. the gas extraction effect is the best, but the gas concentration in the upper corner still reaches 1.42%, which does not meet the safety production requirements, so it needs to be combined with the gas extraction in the upper corner. The research in this paper provides a theoretical basis for the selection and optimization of gas extraction technology in high gas goaf.
采空区瓦斯涌出导致局部瓦斯积聚，不仅容易造成工作面隅角瓦斯浓度超限，还可能引发瓦斯爆炸，严重威胁矿井安全生产。为研究瓦斯抽采技术对采空区瓦斯运移的影响，基于实验参数建立采空区模型，并利用数值模拟软件（Fluent）分析埋管抽采和高位钻孔抽采技术在高瓦斯采空区的应用效果。结果表明：（1）埋管抽采会使采空区内瓦斯浓度沿走向和倾向方向增加，抽采口负压会降低管口处瓦斯浓度以及上隅角附近瓦斯浓度。（2）埋管抽采最佳技术参数为埋管长度30 m、管径0.3 m、抽采流量80 m/min。（3）当上钻孔垂直距离为18.5 m、水平距离为10 m、钻孔间距为8 m时，瓦斯抽采效果最佳，但上隅角瓦斯浓度仍达1.42%，不满足安全生产要求，因此需与上隅角瓦斯抽采相结合。本文研究为高瓦斯采空区瓦斯抽采技术的选型与优化提供了理论依据。
