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在上区段工作面回采后,通过有效支护方法将区段运输平巷保留下来,供下区段工作面开采时作回风平巷使用,称为沿空留巷技术。该技术具有有效防控工作面瓦斯超限、合理开发煤炭资源、提高煤炭采出率、减少巷道掘进量等优点。采用柔模泵注混凝土支护技术沿空留巷后,如果柔模墙体接顶不实或局部压裂可能造成的较大的漏风,加之煤层具有较高的自燃倾向性,可能引起采空区遗煤较多区域发生自燃。介绍了上湾煤矿在采用沿空留巷技术中运用以注氮为主、注浆、加强监测为辅的综合防灭火措施,成功地杜绝了回采期间自然发火事故,确保了工作面的安全回采。
After the upper section of face mining, through the effective support methods will be retained for the section of the laneway for the next section of the face when mining for the return air lane, known as the gob-side entry technology. The technology has the advantages of effective prevention and control of gas over the work face, rational exploitation of coal resources, improvement of coal recovery and reduction of roadway excavation. Adopting the soft-mold pump to inject the concrete supporting technology for gob-side entry, the larger air leakage caused by improper or partial fracturing of the soft-wall wall and the high propensity of spontaneous combustion of the coal seam may cause goaf More area left coal spontaneous combustion occurs. This article introduced the comprehensive fire prevention and extinguishing measures adopted by Shangwan Coal Mine in adopting gob-side entry retaining technology, which is mainly nitrogen injection, grouting and supplemented by monitoring. Successfully eliminated spontaneous fire accidents during the mining and ensured the safe mining of working face .