Research and practice on the method of crossing faults in fully mechanized mining face centered on “avoidance and concession”

In order to reduce the influence of faults on the normal pushing mining of mining face, to ensure various indexes of output and coal quality, and to reduce the difficulty of safety management, based on the practice of working face passing through faults under the condition of thick seam strip mining, this paper puts forward a way of passing through faults, which takes the whole "avoidance and concession" of coal mining face as the center to transform two lanes to avoid rocks.According to the spatial form of faults, the purpose of cutting less or no rocks can be achieved by adjusting the positions of the two lanes and the coal mining face.The stability of strip coal pillar is demonstrated by theoretical calculation.This technology has been successfully applied in 2201 working face of Gucheng Coal Mine, and the advancing speed is normal during mining in the transformation area, which does not cause spontaneous combustion.In most areas, top-coal caving mining is carried out routinely, and more than 387 000 tons of coal are produced; and the blasting operation is not carried out on the working face, the safety and production management is less difficult.It effectively solved the problems of long fault crossing period, great influence of blasting on equipment and low coal recovery rate when working face crossed fault group, and the safe, economical and efficient mining of coal has been successfully realized.