Overburden Failure Associated with Slicing Mining in a Super Thick Coal Seam under Special Weak Aquifers

With the increasing improvement of national ecological standards, eco-environmental problems caused by super thick coal seam mining in western China are becoming more and serious. The failure law weak overburden stratum is an important factor affecting safe coal. characteristics weakly cemented under high-intensity area were studied. For this purpose, a case study was conducted 1101 working face Baituyao Coal Mine Ürümqi County. Based on analysis geological conditions area, we combined empirical calculations with engineering analogy, physical simulation, numerical simulation to comprehensively analyze mining-induced failure. showed that had several unfavorable characteristics, including ease softening presence water. Middle Jurassic Xishanyao Formation directly recharged aquifer water-retaining property. Overburden mainly occurred at two ends open-off cut. During process, vertical fissures bed-separated periodically developed closed, interconnected. fractured, fractured zone trapezoidal shape, tapering off from bottom top. heights caving water-conducting fracture 25 280 m, respectively, Mine, ratio fracturing height 14.0. Due Neogene aquifer, risk water sand bursts still exists mining. Our findings shed light environmental protection ground surface mine shafts China.