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| Study on drainage optimization technology of strong water abundance and weak cementation floor sandstone water |
| Zhang Zeyuan1,2 |
| 1. China Coal Technology and Engineering Group Xi’an Research Institute Co. Ltd., Xi’an 710077, China; 2. National Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology, Xi’an 710077, China |
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Abstract The main coal seam in Ningdong coalfield is Jurassic coal seam. The Baotashan sandstone aquifer of the Yan 'an Formation is the floor of the lower Jurassic coal group, which has the characteristics of strong water abundance, large static reserves and poor cementation. It is the main water-filling source affecting the mining of the lower coal group. The new Shanghai No.1 coal mine is about to be mined. The floor aquifuge of No.1 partition of No.18 coal seam is thin, the pressure is high, and the water outburst coefficient is greater than 0.1 MPa/m, all of which belong to the water outburst danger zone. This paper took the No.1 coal mine of the new Shanghai as the research area. Based on the hydrogeological conditions exploration and underground water discharge test of the sandstone aquifer in the Baota Mountain, the hydrogeological characteristics were studied. The feasibility of the sandstone dewatering in the Baota Mountain was demonstrated by constructing the groundwater flow numerical model, and the dewatering management model was established. Finally, combined with the mining layout of the No.1 partition of No.18 coal seam, the optimal dewatering management scheme was proposed, and the drainage water was expected to be 2.99358 million m3. Compared with the design of groundwater drainage optimization management, it was estimated that the amount of drainage water was reduced by 1.88242 million m3. While protecting the mine water resources, the production cost was reduced. The research could provide some reference for the drainage of sandstone water in strong water abundance and weak cementation floor under similar conditions in the future.
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