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重庆中梁山煤矿采取瓦斯抽放措施,使矿井的瓦斯涌出量降低40％以上,采区瓦斯涌出量降低60～70％,不仅保证了煤矿的安全生产,而且抽放出来的瓦斯,经井下、井上的管网集输到地面,还用来生产甲醛和炭黑,代替了数千户职工家庭的生活用煤。煤矿瓦斯的主要来源,一般是开采层、邻近开采层、夹层和围岩。在多煤层矿井中,由于开采其中某一煤层而造成的地压活动,使其上下邻近的煤层因卸压产生裂隙,瓦斯便顺裂隙大量泄入开采层。因此,抽放瓦斯所钻的井眼,多选择于开采的邻近层。也有在回采层本身抽放瓦斯的。
The gas drainage measures will be taken in Zhongliangshan Coal Mine in Chongqing to reduce the gas emission of mines by over 40% and the gas emission in mining areas by 60-70%. This not only ensures the safe production of coal mines, but also reduces the gas emission, Downhole, uphole pipe network set to the ground, but also for the production of formaldehyde and carbon black, instead of thousands of families living coal. The main source of coal mine methane, usually mining layer, adjacent to the mining layer, interlayer and wall rock. In coal mines with multiple coal beds, due to the underground pressure caused by the mining of one of the coal seams, fractures of the coal seams adjacent to the upper and lower sides due to the pressure relief cause a large amount of gas to flow into the mining layers. Therefore, the boreholes drilled by drainage gas are mostly selected in the adjacent layers of mining. There are also gas drainage in the mining layer itself.