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选择近距离煤层作解放层开采时,由于煤层之间距离近,卸压瓦斯向采空区方向流动的阻力小,邻近煤层受采动影响卸压快,在采空区通风负压和瓦斯压力的作用下,必然会出现大量的邻近层卸压瓦斯涌入回采工作面的现象。导致解放层工作面回风流中瓦斯超限,影响正常的安全生产,并给开采解放层抽放瓦斯工作带来较大的困难。国外曾有人提出,在缓倾斜和倾斜条件下,距开采层下部6m 以内的煤层列为不可抽放的煤层。因此,在选择近距离煤层作解放层开采
When selecting the short distance coal seam for the mining of the unconsolidated layer, due to the close distance between the coal seams, the pressure relief gas flowing toward the goaf is less resistant, and the adjacent coal seam is rapidly decompressed by the mining. In the goaf, the negative pressure and the gas pressure The phenomenon that a large amount of pressure relief gas of adjacent layers will inevitably flow into the mining face will inevitably occur. Leading to the overrun of methane in the return air flow in the working face of the liberated level, affecting normal safety production and bringing greater difficulties to the operation of gas drainage from the liberated floor. It has been suggested in foreign countries that under gently inclined and inclined conditions, coal seams within 6m from the lower part of the mining layer shall be classified as non-drained coal seams. Therefore, in the choice of near coal seam for the liberation of mining