Research on the Waterproof Coal Pillar Design for Coal seam group mining goaf

摘要

The Xinqiang mine is the close distance coal seam group mining, which distance is about 20-30 meter. Because the disordered mining of the small coal mine early and unreasonable exploitation mode of itself, the mine has appeared multiple cracks and collapse pit on the surface, and mining areas were communicated with each other, connected network complex formed between the upper and the lower coal seam gob. With the mining depth increasing, the formation of shallow mining goaf water has become a major threat water to the deep extension of mining. Based on the actual situation of coal mining, The water retaining wall have been set on the connectivity of shallow mining area, which objective is to partition the hydraulic connection between the mining and the other undeveloped mining. In order to ensure the safety of deep mining, The reasonable security isolation coal rock pillar were set for overlying coal seam and side seam goaf water area , and determine the deep coal mining upper limit, to realize the safe mining of close coal seam mining under goaf. Research results show that: the key to the feasibility of mining the deep were the strength and resistance to water pressure of water sealing and the coal seam group mining failure coverage and degree. Only both the roof waterproof safety pillars and the same seam water pillar would consider, the deep mining feasibility and safety were ensured.