Practice and mode of gas control technical innovation in Yangquan Mining Area

In view of the serious situation of coal and gas outburst in Yangquan Mining Area,in combination with gas geological characteristics in this area, the “one borehole is a project” gas control mode is proposed by adopting the gas drainage borehole in mining seam. The results show that the drilling quality and the efficiency of gas drainage are greatly improved through technical innovation, quality standardization management of drilling engineering, process quality management and target management. The concentration of gas, which come from gas drainage of the borehole in mining seam, is increased from former average of 8% to 40% or more, which is approximately an increase of five times; gas drainage flow of 100 m single borehole increase by 2 to 3 times, from 0.01 m3/min to 0.03～0.04 m3/min. The application of the proposed gas management model reduce the number of drilling boreholes and save the cost of gas control, which significantly improve the level of gas control in Yangquan Mining Area and guarantee the coal mine production safety.