关键词: 超长推进距离, 综采工作面, 双巷掘进, 沿空掘巷, 煤柱回收

Abstract: The 31303 working face of cha ha shu coal mine adopts the technology of mining full height. The mining height is 6m and the pushing distance is 4500m, which is an ultra-long pushing distance. In order to meet the requirements of ventilation and auxiliary transportation, double roadway drivage is adopted, but there are some problems such as low recovery rate and difficult maintenance of secondary mining roadway. If the Gob-side entry driving technology is used, the roadway ventilation and auxiliary transportation are difficult, and in order to avoid the island working face, the working face needs to jump between the mining area or the coal seam, which cannot meet the centralized production requirements and easily cause coal pressure. In order to solve the problem of double roadway driving and the difficulties existing in the application of the technology of driving roadway along the goaf, the super-long propulsion is put forward. The technology of the distance face along the gob is applied to the 31303 super-long distance working face. The key parameters of the technology are determined by combining the theoretical analysis and the field measurement. This technology can avoid the severe influence of mining, improve the maintenance state of roadway, realize the smooth mining of roadway along the goaf, and recover most coal pillars between the two roadways, so that the recovery rate can be improved significantly.