近距离下岩石保护层开采可行性研究

Feasibility analysis of lower rock protective layer mining in the closed distance and deep seam

为有效治理深部矿井瓦斯,以平煤股份十矿己-24130底板岩石保护层工作面为研究对象,以理论计算和数值模拟的方法,从瓦斯参数、层间距、开采条件、"三带"分布、应力变化等方面对己组下岩石保护层开采的可行性进行分析。结果表明:下保护层的最大有效垂距为88 m,垮落带高度6. 4 m±2. 2 m,裂隙带高度28 m±6 m,开采后应力下降明显、卸压效果显著,下岩石保护层开采可行。

In order to effectively control the gas in the deep mine,the working face of the rock protective layer of the Ⅵ-24130 floor of Pingdingshan No.10 Coal Mine was taken as the research object.The theoretical calculation and numerical simulation method were used to derive the gas parameters,layer spacing,mining conditions and "Three Zone".The feasibility of mining the rock protective layer under the group was analyzed in terms of stress changes.The results showed that the maximum effective offset of the lower protective layer was 88 m,the height of the fall zone was 6.4 m±2.2 m,and the height of the fracture zone was 28 m±6 m.The stress decreases after mining and the pressure relief effect is significant.Rock protection layer mining is feasible.