Application of Outburst Elimination Technology with Hydraulic Pressing to Seam Gateway Driving in Shijingtou Mine

According to the serious coal and gas outburst danger in the mining seam of Shuijingtou Mine and the slow advancing rate of the seam gateway driving f ace, based on the seam deposit features, an outburst elimination technology with the hydraulic pressing was conducted in the seam gateway driving face.With the theor etical study, the borehole layout was determined as a delta mode, the water injection borehole depth was 8 m, the rational borehole sealing depth was 3 m, the rational pressure of water injection was 12~16 MPa, the effective influence scope of the water injection borehole was 1.0~1.5 m, the water injection process required 20~40 min and the water injection Value was 4~6 m3.After the water injection completed, gas desorption index K1 of the cuttings reduced from 0.65 mL/ (g:min1/2) to 0.22 mL/ (g. min1/2)，displacement value of the coal mass was 60~120 mm, the width of the pressure released zone was increased by 5 m, a month driving rate reached to 75~90 m and the driving speed increased by more than one time.