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确定合理的专用排瓦斯巷参数是确保能否高效治理综放工作面瓦斯积聚及上隅角瓦斯超限现象的关键。结合五阳煤矿7605工作面的实际情况,采用瓦斯运移规律、矿压理论、矿井通风等理论及FLAC3D数值模拟软件,对专用排瓦斯巷的合理层位、距离回风巷的水平距离、巷道断面面积等参数进行了研究。结果表明,专用排瓦斯巷适合布置在岩层垮落带的中下部,距离回风巷的水平距离受巷道等效半径影响,巷道断面面积由通风能力和掘进工程量决定,7605工作面专用排瓦斯巷的3个参数分别为距煤层顶板2.65~6.75 m、距离回风巷水平距离约15 m、巷道断面面积7 m~2。现场应用表明,工作面回采期间瓦斯体积分数维持在0.3%左右,上隅角瓦斯体积分数未发生超限,瓦排巷与工作面连通顺畅,瓦斯治理效果显著。
It is the key to ensure that the gas accumulation in fully mechanized top coal caving face and the gas overrun in the upper corner can be effectively determined by determining the reasonable parameters of exclusive gas row. Combining with the actual situation of 7605 working face of Wuyang Coal Mine, this paper adopts the theory of gas migration, the theory of mine pressure, the ventilation of mine and the numerical simulation software FLAC3D to analyze the reasonable horizon of special gas drainage tunnel, the horizontal distance from air return tunnel, Section area and other parameters were studied. The results show that the special row of gas lanes is suitable for the middle and lower part of the caving zone. The horizontal distance from the return lanes is affected by the equivalent radius of the roadway. The section area of the roadway is determined by the ventilation capacity and the amount of driving engineering. The three parameters of the lane are respectively 2.65 ~ 6.75 m from the roof of coal seam, horizontal distance from air return lane is about 15 m, and the cross-sectional area of roadway is 7 m ~ 2. The field application shows that the volume fraction of gas in the working face during mining is maintained at about 0.3%, the volume fraction of gas in the upper corner does not exceed the limit, and the smooth connection between the tile discharging lane and the working face is achieved. The gas treatment effect is remarkable.