Technology of Overlying Goaf Water Drainage in Shallow Depth Contiguous Seams

In order to solve the problems of long time drainage, great prpeare quantities and complicated drainage system of traditional water drainage technology, the drainage technology of No.22301 fully- mechanized coal mining face in Daliuta Coal Mine was researched. The paper adopted the technology of directly emissions through the group of holes to the pump, based on the detailed overlying goaf on the floor up and down situation, determined the main water area, then constructed multi ple drainage holes in overlying main water area, then the drain hole and high- power centrifugal pump directly connected, the water was drainaged directly to the groun d, no longer transfered through water sump, and simplified the drainage system. The results showed that the drainage time needed shorten than that of the traditional m ethods for three months in No.22301 fully- mechanized coal mining face, and saved a lot of engineering and equipment costs, roof basic no rain water in coal mining fa ce during the mining, implemented the green drainage overlying the purpose of goaf water efficient.