摘要
针对极近距离煤层群开采过程中,覆岩裂隙发育、瓦斯运移复杂、回风隅角瓦斯易超限等问题,本文以某煤矿EIN 56-5综放工作面回风隅角瓦斯超限案例为研究背景,采用理论分析、数值模拟及现场实践的方法,分析了瓦斯超限影响因素,模拟分析了工作面覆岩破坏过程及应力分布,提出了“分阶段、差异化”的瓦斯治理思路,并在EIN 56-5综放工作面实践应用。研究结果表明:EIN 56-5工作面回风隅角瓦斯超限是由上覆坚硬顶板、瓦斯抽采措施不合理等多种因素耦合造成的;工作面垮落带最大高度为8.95 m,裂隙带最大高度为20.33 m;工作面后方自燃三带范围分别为:0~25 m为散热带、25~70 m为升温氧化带、70 m以内为窒息带;通过合理的瓦斯抽采措施实施,瓦斯抽采率达到77%,回风隅角及回风巷未发生瓦斯超限,进而确保了工作面的安全回采。
In view of the problems such as the development of overlying rock fractures,the complexity of gas migration,and the easy overrun of gas in the corner of return air during the mining of extremely close distance coal seams.Taking the gas overlimit in the corner of return air of EIN 56-5 fully mechanized caving face of a coal mine as the research background,the influencing factors of gas overlimit are analyzed by means of theoretical analysis,numerical simulation and field practice,and the failure process and stress distribution of overburden rock in the working face are simulated and analyzed.The gas control idea of“stages and differences”is put forward,and it is applied in practice in EIN 56-5 fully mechanized caving face.The results show that the gas overlimit in the corner of return air of EIN 56-5 working face is caused by the coupling of several factors,such as overlying hard roof and unreasonable gas extraction measures.The maximum height of the caving zone and fracture zone is about 8.95 m and 20.33 m,respectively.The three zones of spontaneous combustion behind the working face are 0-25 m is the scattered zone,25-70 m is the heating oxidation zone,and within 70 m is the suffocating zone.Through the implementation of reasonable gas extraction measures,the gas extraction rate reached 77%,and no gas excess occurred in the corner of the return air and the return air lane,ensuring the safe mining of the working face.
作者
崔永乐
CUI Yongle(China Energy Shendong Coal Group Co.,Ltd.,Yulin 719315,China)
出处
《中国矿业》
2023年第1期100-106,共7页
China Mining Magazine
关键词
极近距离
瓦斯超限
回风隅角
瓦斯治理
extremely close distance
gas overlimit
air return corner
gas control
