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| Study on the technology of draining water accumulated in old goaf by pre-buried pipe in No.12 Mine of Pingdingshan Coal |
| Nan Lichao, Tian Fangzheng |
| Henan Institute of Geophysical Space Information, Zhengzhou 450000， China |
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Abstract Water accumulation in old goaf is one of the main factors threatening coal mine safety production. The Ji15 coal and Ji16-17 coal in the No.12 Mine of Pingdingshan Coal are close distance coal seams. The working face of Ji16-17 coal seam was seriously affected when mining by the overlying Ji15 coal and the water accumulation in the goaf of the coal seam. In order to realize the effective drainage of the water accumulation in the goaf, during the mining of No.31050 Face in Ji16-17 coal seam, the drilling was carried out in the floor gas drainage roadway to No.31050 Face in Ji16-17 coal seam, and the steel casing was pre-buried. Until the adjacent No.31030 Face in Ji16-17 coal seam was mined, a total of 56 853 m3 of water accumulated in old goaf was drained, which ensured the safe and efficient mining of the coal mine.
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