九里山矿14区放顶煤开采瓦斯涌出规律分析

Analysis of gas emission law by sublevel caving minging method at No.14 zone in Jiulishan coal mine

分析了焦作矿务局九里山矿放顶煤工作面沿底掘进及开采期间各生产工序瓦斯涌出规律． 与顶分层开采对比， 放顶煤开采相对瓦斯涌出量降低， 绝对瓦斯涌出量增加倍数小于产量提高倍数， 各生产工序以放煤时瓦斯涌出量最大； 沿顶掘巷的平均瓦斯涌出量是沿底掘巷的１ ．２５ 倍，

The gas emission law in each production process during the mining period at the sublevel caving face by driving along the roadway floor have been studied.With the caving mining method(comparing with the caving slicing method),the relative gas emission rate has decreased,and the increasing rate of the absolute gas emission is less than that of the output,but the gas emission rate is maximum in each production process during the drawing.When driving along the roof,the average gas emission rate is 1.25 times than that of driving along the floor.Namely,the outburst will not increase when driving along the floor.