| Gaojiapu field is located in the northwest of Binchang mining area,coal-bearing strata for the Jurassic Yan'an Group, the main mining 4 coal.The main water-bearing aquifer is the coal seam roof straight Luo group and Luohe group aquifer. Among them, the water layer of Luohe Formation is huge and rich in water, which has great influence on coal mining. In this paper, the geological and hydrogeological conditions of the study area are analyzed on the basis of the geological and hydrogeological conditions of the study area. The water level of the roof of the Luohe Formation is divided in detail, And then the risk of coal seam roof water damage is predicted.Firstly, FLAC3D numerical simulation software was used to study the overburden failure and the development law of water diversion zone under different mining height, different mining width and different mining technology. Then, according to the empirical formula method, the numerical simulation method and the field measurement method, the development height of the aquifer zone in the study area was determined.Based on the interaction mechanism of water and rock, the mining failure model of overburden under heavy and high pressure aquifer was put forward. The water inrush mechanism of coal seam roof in thick and high pressure aquifer is studied, and the problem of retaining the coal pillar of waterproof and safe is studied. Finally, the effects of sandstone equivalent thickness (X1), sandstone lithology coefficient (X2), sand layer number (X3), core rate (X4) and sand and sand interbedding coefficient (X5) Water richness model based on Fisher discriminant analysis was used to forecast the water richness of aquifer in the study area. Considering the influence of the effective thickness of the aquifers on the roof water damage, the risk of water hazard in the study area is predicted and partitioned. The research results have important theoretical and practical significance for the prevention and control of mine water damage. |
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