Practice of outburst prevention by pre-driving rock roadway unloading pressure of coal roadway strip in Fengcheng mining area

In view of the new characteristics of the coal and gas outburst disaster of single serious outburst dangerous coal seam in the deep mining area of Fengcheng mining area, the article puts forward regional outburst prevention measures of unloading pressure by pre driving rock roadway and constructing wear layer drilling to pump coal roadway strip gas, a complete set of technical system of regional outburst prevention in coal roadway strip by pre driving and unloading floor roadway in the Fengcheng mining area is obtained. The field practice shows that after entering the deep mining stage, under the conditions of high stress, high gas, high temperature and low permeability, the situation of outburst occurrence is more and more serious, and the mechanism is more complicated, although coal roadway of B4 coal seam has taken the measure of construction of drilling for pre pumping gas along B4 coal seam, but the damage of the high ground stress has not been completely eliminated, the proportion of in-situ stress dominated outburst is increased. Regional outburst prevention is carried through pre driving of floor roadway layout in the rang of 8 similar to 12m which just below the coal roadway to carry on the pressure relief combined with crossing drilling drainage gas,, it can greatly improve the permeability of coal seam and the effect of pressure relief, and ensure the safe and fast roadway driving.