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通过微震系统的定位分析,得出围岩的超前破裂范围为面前90m,由于受到4#解放煤层的作用,相对缓解了3B#煤层回采煤体的超前支承压力,且整体事件的能量较小,不会造成3B#煤层的大面积来压现象。结合剖面定位结果分析得知,3B#右三工作面的顶板活动范围受到4#煤层开采的影响,致使顶板岩层的裂隙高度集中在60米范围内;通过顶板裂隙高度判断,4#煤层采空区瓦斯会对3B#煤层的回采造成一定的影响,可采取提前抽放的方式降低4#煤层老空区的瓦斯浓度。工作面底板破裂深度集中在15m范围内,最大破裂深度为45m。
According to the location analysis of the microseismic system, it is concluded that the frontal rupture of the surrounding rock is 90m in front of the coal seam. Due to the effect of the 4 # liberated coal seam, the advanced bearing pressure of coal seam 3B # seam is relatively relieved, and the energy of the whole event is small , Will not cause a large area 3B # seam pressure phenomenon. According to the analysis of profile positioning results, it is found that the roof activity of 3B # right three face is influenced by the mining of No.4 coal seam, resulting in the crevice height of the roof strata concentrated within 60 meters. According to the roof crevice height judgment, District gas will have some impact on the mining of 3B # coal seam, which can reduce the gas concentration in the # 4 coal seam airspace by adopting the method of gas drainage in advance. The depth of the floor of the working face is concentrated within 15m and the maximum rupture depth is 45m.