上保护层开采遗留煤柱对保护效果的影响
Influence of residual coal pillar from upper protective layer mining on protection effect
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摘要: 为研究上保护层开采遗留区段煤柱对被保护层保护效果的影响，以平煤四矿己15-23160联络巷下帮遗留的4 m煤柱及己15-23140、己15-23160、己16.17-23140工作面为研究对象，采用数值模拟和现场实测相结合的方法进行了研究。研究结果表明：煤柱沿z轴负方向被压实，累计最大位移为0.289 m；煤柱两侧煤壁沿x轴移动方向不同，上壁沿x轴负方向，下壁沿x轴正方向，累计位移量分别为0.055m和0.156m，己15-23160工作面采掘活动对煤柱位移影响最为显著；遗留煤柱最大残余高度为0.59 m，相比原始煤柱高度降低1.01m；深部煤体残余瓦斯含量和钻屑量变化趋势一致，最大残余煤层瓦斯含量2.63 m3/t，煤层瓦斯释放率保持在50％以上，最大钻屑量为3.7kg/m。残余煤柱影响区内煤层瓦斯得到很好地释放且无明显应力集中，保护层开采遗留4m煤柱能够达到连续的保护效果。Abstract: In order to study the influence of the coal pillar left in the upper protection layer on the protection effect of the protected layer, the 4 m coal pillar left at the lower side of Ⅵ15-23160 connecting roadway and Ⅵ15-23140, Ⅵ15-23160 and Ⅵ16.17-23140 working faces in Pingmei No. 4 Mine are taken as the research objects. The research is carried out by combining numerical simulation and field measurement. The research results are as follows: the coal pillar is compacted along the negative direction of the z axis, with a cumulative maximum displacement of 0.289 m; the coal walls on both sides of the coal pillar move in different directions along the x axis, the upper wall is along the negative direction of the x axis, the lower wall is along the positive direction of the x axis, and the cumulative displacement is 0.055 m and 0.156 m, respectively; the mining activities of Ⅵ15-23160 working face have the most significant impact on the displacement of the coal pillar, and the largest remaining coal pillar is 0.59 m, which is 1.01 m lower than the original coal pillar height; the residual gas content of deep coal has the same change trend as the amount of drill cuttings. The maximum residual coal seam gas content is 2.63 m3/t, and the coal seam gas release rate remains above 50%, and the maximum amount of cuts is 3.7 kg/m. The coal seam gas in the area affected by the residual coal pillars is well released without obvious stress concentration. The 4 m coal pillar left by protective layer mining can achieve continuous protection.
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