Pressure released and outburst prevention technology of seam gateway driving in deep single serious outburst seam

in order to eliminate the outburst danger of a mine seam gateway driving in the deep mine single serious outburst seam,the paper theoreticaly analyzed the outurst composite energy and mechanics features of the deep seam gateway and provided the pressure released and outburst prevention techncology of the pre-heading foor rock roadway.The numerical simulation in combination with the actual Fengcheng Mining Area was applied to determine the pre-heading floor rock roadway should be located at 8~ 12 m underneath practices showed that the pressure released and outburst prevention effect of the pre-heading foor rock roadiway was remarkable the max displacement of the surrounding rock was 4.1 cm,the parttion cracking phenomenon occurred in the surrounding rock and there were four cracking zones generally. The initial gas flow of per meter borehole and the permeability coeficient of the seam could be 14.39 and 5.70 times higher than te insitu seam,the gas drainage density was improved by 5 times and the gas drainage volume of a single borehole was improved by 10 times.There was no over linit phenomenon occurred in the effective inspection index of the seam gateway.the driving speed of the seam gateway was improved from 40 m/month to 100 m/month and the safety and rapid drving of the seam gateway was realized,and could provide important referencesignificances to the mines with the similar conditions.