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针对塔山煤矿大采高综放工艺采空区瓦斯涌出量占工作面总涌出量82%,工作面上隅角、支架缝隙瓦斯超限频繁等问题,以回采期间采空区瓦斯赋存量变化规律为基础,在采空区垮落带布置高位巷,利用周期垮落实现“一巷两用”的采空区瓦斯治理技术。经试验考察,高位巷布置在开采层上部垮落带2#煤层中,回采工作面开采初期,高位巷作为专用瓦斯巷引排采空区瓦斯,将工作面通风方式由“U”型改造为“U+I”型,高位巷瓦斯排放量逐步增长至30 m~3/min,回风巷风排瓦斯量由初始平均值23 m~3/min降至5 m~3/min以下;开采中后期,高位巷被密闭作为大管径抽采巷负压抽排采空区瓦斯,抽排量提升至40 m~3/min,较引排作用提高33%。工作面回采期间,上隅角瓦斯浓度均持续控制在0.6%以下,有效防治采空区瓦斯涌入回采面。
Aiming at the problems such as gas emission in the mined area of Tashan coal mine with large gob height and fully mechanized top coal caving, accounting for 82% of the total discharge, the upper corner of the working face and frequent gas overrun of the support gap, Based on the law of volume change, the high-level alley is arranged in the caving zone of the goaf, and the period-period caving is used to realize the gas control technology in the “goaf”. After test and investigation, the upper alley is arranged in 2 # coal seam in the caving zone at the upper part of the mining layer. In the early mining of the working face, the upper alley leads the methane of the goaf as the special gas lane, and the ventilation mode of the working face is changed from “U” The gas emission from the return airway was reduced from the initial mean value of 23 m ~ 3 / min to 5 m ~ 3 / min with the conversion of “U + I” min. In the middle and later stages of mining, the upper alley is sealed as a negative pressure in the large-diameter extraction tunnel to extract and remove the gob of gas, and the displacement is increased to 40 m ~ 3 / min, which is 33% higher than that of the draft. During the process of face mining, the gas concentration in the upper corner will be continuously controlled below 0.6%, effectively preventing the gas influx into the mining face.