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| Study on mining technology of trial mining lower group coal in Niuerzhuang Mine |
| Wang Zhidong |
| Handan Niuerzhuang Mining Co., Ltd., Handan 056300, China |
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Abstract Niuerzhuang Mine is a aging mine, the upper group coal has been basically mined out. There are still a large number of lower group coal resources with super water outburst coefficient in the coal mine field. Whether it can be mined or not has become a major technical issue that needs to be solved urgently. Niuerzhuang mine field is located in North China. The mining of the lower coal group in the karst area of the coal field in this area is threatened by the karst water of the Middle Ordovician strata in the basement to varying degrees. The karst water system has a wide recharge area, abundant water sources, strong conductivity, karst development and strong water richness. In view of the problem that the lower group coal was threatened by the karst water in the middle Ordovician strata of the basement, on the basis of studying the mechanism of water outburst from the coal seam floor, combined with the hydrogeological conditions of the mine, the regional control technology was adopted to transform the eighth section of the Fengfeng Formation at the top of the Ordovician limestone aquifer. On the basis of increasing the anti-disaster pump room, comprehensive measures such as comprehensive exploration, local re-reinforcement, monitoring and early warning of water damage were adopted to achieve the purpose of disaster reduction and prevention, and realized the safe mining of the lower group coal.
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