Gas Cubic Drainage Technology of High Gassy Coal Mining Face

According to the problem the upper corner gas in coal mining face and air returning gateway was hardly contrdled when a U type ventilation system was applied to the coal mining face in a high gassy mine, in combination with the actual conditions of Tunlan Mine, a gas cubic drainage system was established in No.2810 8 coal mining face. With the gas drainage operations with the boreholes along in the mining seam + high and low level inclined boreholes in the roof + boreholes along t he strike of the roof + boreholes in the downward neighboring seam + boreholes in the coal pillars of the goaf + the pipeline buried in the goaf, the gas drainage rate of the coal mining face was over 68% and the gas control could be realized from the gas sources. Meanwhile, the ventilation distribution management of the coal mining fa ce was optimized and the gas volume fraction of the upper corner in the air returning gateway was reduced from 0. 85% to 0.43%. During the coal production period, th e gas volume fraction of the air returning flow in the coal mining face was stabilized below 0. 5% and a high efficient joint mining of the coal and gas were realized.