Study and Application on Comprehensive Outburst Prevention and Control Technology for Seam Opening in Mine Inclined Shaft

According to the special gas abnormal conditions occurred when north inclined air returning shaft of Mayixi No. 1 Mine passing through No.19 seam,in 0 rder to prevent coal and gas outburst,gas drainage with the cross boreholes in drilling field,coal mass surrounded the mine shaft at the seam opening location reinforce d with grouting,the seam roof controlled and reinforced with the metal framework when the construction operation passing through the coal crosscut and the comprehen sive outburst prevention technology with a small cross vibration blasting were applied to realize the safety seam opening. The gas pressure at the seam opening locatio n was reduced from 1. 52 MPa to0. 38 MPa,the gas content was reduced from 14. 3 m3/ t to 4.8 m3/ t,and both were not over the national and the mine critical value. T he outburst danger in the seam opening process was effectively eliminated,the seam opening period was reduced and the mine safety and high efficient production was ensured.