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首采煤层群关键层是消除邻近煤层突出危险性行之有效的方法。以淮南新庄孜煤矿66210工作面为例,在综合分析采空区上覆岩层竖向3带以及瓦斯运移基本条件的基础上,将上被保护层所产生的卸压瓦斯运移路径简化为:被保护层→上覆岩层竖向裂隙→采空区→回风巷。为了保障首采保护层工作面的安全回采,提出并实施了卸压瓦斯综合治理技术,对被保护层卸压瓦斯、首采层顶板裂隙发育区富集瓦斯、采空区瓦斯进行强化拦截抽采。采用沿空留巷Y型通风方式消除上隅角瓦斯积聚,降低风排瓦斯量,工作面回风瓦斯体积分数在0.6%以下,实现了高瓦斯煤层群首采工作面的安全高效生产。
The first key coal seam group is the key to eliminate the adjacent coal seam prominent danger of effective method. Taking the 66210 working face of Xinzhuangzi Mine in Huainan as an example, on the basis of comprehensive analysis of the vertical 3 zones in the overlying strata of the goaf and the basic conditions of gas migration, the pressure relief gas migration path caused by the protective layer is simplified to : Protected layer → overlying strata vertical cracks → goaf → return airway. In order to ensure the safe recovery of the working face of the first mining protective layer, the comprehensive management technology of pressure relief gas was put forward and implemented to intensify the intercepting and pumping of the methane enriched gas and goaf gas in the protected area, Mining. Adopting the gob-side entry Y-type ventilation to eliminate the accumulation of gas in the upper corner, reduce the amount of air discharged and the volume of return air in the working face below 0.6%, the safe and efficient production of the first coal face in the high-gassy coal seam group is achieved.