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治理瓦斯最有效的措施是进行瓦斯抽放。瓦斯抽放的技术很多,如底板穿层钻孔抽放瓦斯技术、顺层孔抽放瓦斯技术、高位钻孔瓦斯抽放技术和埋管抽放采空区瓦斯技术等。其中高位钻孔瓦斯抽放技术在淮北矿区得到了推广应用。依据71212机巷、切眼、风巷掘进时瓦斯涌出量,平均瓦斯涌出量在3.2m3/min左右,正常回采时瓦斯涌出量将在26.2m3/min左右。因此,决定采用高位水平钻孔来抽放采空区瓦斯,保证回采工作面和上隅角瓦斯不超限。结合71212工作面设计资料,准备在71212风巷沿煤层走向方向,位于71212顶板上方岩层中施工高位水平钻孔,利用高位水平钻孔对71212工作面瓦斯进行抽放。本设计通过长期对71212风巷1#钻场瓦斯综合参数测量并进行分析,确定抽采效果。
The most effective measure to control gas is to conduct gas drainage. There are many technologies for gas drainage, such as drilling through holes through the floor, gas drainage through layers of holes, gas drainage through high-level boreholes and gas drainage through goafs. Among them, high-level borehole gas drainage technology has been popularized and applied in Huaibei Mining Area. According to 71212 machine lane, cut eye, gas tunneling gas emission, the average gas emission in the 3.2m3 / min or so, the normal gas emission will be around 26.2m3 / min. Therefore, the decision to adopt high horizontal drilling to drain the gob gas, to ensure that mining face and upper corner gas does not exceed the limit. Combined with the design data of 71212 face, it is planned to construct the high level horizontal borehole in the 71212 wind tunnel along the coal seam direction in the rock formation above the 71212 roof, and to exhaust the gas of 71212 face with high horizontal drilling. The long-term design of the 71212 gas Lane 1 # gas field comprehensive parameters measured and analyzed to determine the pumping effect.