Research on combined gas extraction technology of high andbottom extraction lane in high gas mine
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摘要: 针对煤矿松软低透煤层U型通风回采工作面的瓦斯治理存在抽采效率低、抽采浓度低、煤层透气性差、打钻成孔难等问题，以山西晋煤集团赵庄矿1307综采工作面为研究对象，提出了一种高瓦斯矿井高抽巷和底抽巷联合抽采的瓦斯抽采技术，即在原有U型通风的基础上外加一条高抽巷、一条中部底抽巷和一条边部底抽巷，边部底抽巷掩护2个掘进工作面的掘进，中部底抽巷穿层区域条带预抽本煤层瓦斯，高抽巷抽采上隅角瓦斯。确定了边部底抽巷和中部底抽巷的层位、钻孔布置及高抽巷的合理层位布置。实际应用结果表明，边部底抽巷掩护的煤巷掘进工作面最大瓦斯体积分数为0.48%，穿层钻孔抽采有效降低了掘进工作面的瓦斯涌出量；中部底抽巷抽采本煤层瓦斯后，瓦斯含量平均下降了4.18 m3/t；高抽巷抽采负压为12～15 kPa时，抽采纯量在46.13 m3左右，减小了瓦斯向工作面涌出。Abstract: In order to solve the problems of low extraction efficiency, low extraction concentration, poor permeability of coal seam and difficulty in drilling holes in the gas management of U-ventilated return working face of loose and low-permeability coal seams, the combined gas extraction technology of high and bottom roadway in high gas mine is proposed. The research object of this paper is 1307 fully mechanized mining face of Zhaozhuang Mine of Shanxi Jin Coal Group. The technology consists of a high extraction lane, a central bottom extraction lane and a side bottom extraction lane on the basis of the original U-shaped ventilation. The side bottom extraction lane covers the drilling of two heading faces, the central bottom extraction lane penetrates the strip of the seam area to pre-pump the gas of the coal seam, and the high extraction lane extracts the gas from the upper corner. This study proposes the position of the side bottom extraction lane and the central bottom extraction lane, and proposes the drilling arrangement and the reasonable layer arrangement of the high extraction lane. The practical application results show that the maximum gas volume fraction of the coal working face covered by the side bottom extraction lane is 0.48%, and the extraction through the layer drilling reduces the gas emission from the heading face effectively. After the central bottom extraction lane extracting the gas from this coal seam, the gas content decreases by 4.18 m3/t on average. As the negative pressure of the high extraction lane is 12-15 kPa, the pure extraction volume is stable at about 46.13 m3, which reduces the gas emission to the working face.
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