Hydrogeologic Characteristics of Mine Water Hazards in Shendong Mining Area

Using the methodologies of hydrogeology and lithofacies paleogeography we categorize the hydrogeologic types of Shendong mining area,and develop the conceptual models of mining water hazards of each type.The study shows that,in Shendong mining area,there exist two types of hydrogeologic conditions:one is characterized by "shallowly-buried Early-Jurassic coal seams,barely-reserved bedrocks and heavily-overlaid Quaternary porous sand aquifers", Quaternary aquifers of which poses great threat of water bursting and sand inrush to the underground coal mines;the other is featured as "deeply-buried Early-Jurassic coal seams, well-reserved Middle-Jurassic Zhiluo Formation and heavily-overlaid Cretaceous porous fissure aquifers",Cretaceous aquifers of which potential water bursting risk exists to the underground coal mines.The well-reserved Zhiluo Formation serving as an ideal natural aquifuge greatly contributes to water-inrush prevention and water protection in this region.This study does favor to effectively prevent water flooding and protect Cretaceous groundwater in Shendong and other mining areas in Ordas basin.