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孙村煤矿目前主要开采水平为-1100m。随着向深部开采,地温升高,深部煤层自燃发火期缩短,且顶板岩性发生变化,3#与4#煤层间距变小,开采四层煤后,相当于放顶煤开采,三层煤呈破碎状态堆积形成浮煤,引起煤层自燃发火。工作面开采过程中通过采用建立完善监测系统、注氮、注浆、注胶、合理控制风量、加快工作面推进速度等综合防治措施,保证了工作面安全开采,提高了矿井经济效益。
Suncun coal mine is currently the main level of -1100m. With the deep mining, the ground temperature rises, spontaneous combustion period of deep coal seam shortens, and the roof lithology changes, the interval between No. 3 and No. 4 coal seam becomes smaller. After mining four layers of coal, the equivalent of top coal caving mining, Coal was crushed to form floating coal accumulation, causing spontaneous combustion of coal seam. During the process of mining face, comprehensive control measures such as establishing and perfecting monitoring system, nitrogen injection, grouting, injecting glue, reasonable control of air volume and accelerating the advancing speed of working face are adopted to ensure the safe mining of working face and increase the economic benefit of mine.