| Movement and failure of underground-induced strata can make surface and underground water in mining scope inrush coal mine and bring enormous harm to production safety and ecological environment. This damage is more prominent in full-mechanized top-coal caving mining. So, it is great theoretical and practical value for improve the recovery rate of coal resources, protect the mine production safety and ecological environment in mining areas that in-depth study the height and distribution patterns of the fractured zone.In this paper, the research object is full-mechanized top-coal caving mining of very thick seam in 3 mining area of Chenjiagou mine in Huating coal mine. Detailed analysis the geology and mining conditions of Chenjiagou mine. Synthetically consider the lithology of overburden, mechanical properties and distribution of aquifer and aquifuge. Analysis the main factors of the height and distribution pattern of fractured zone. Combine the topographic, geological and mining conditions in Chenjiagou mine. Use the leakage measuring by the upward slant drilling plugging double-ends testing the height of fractured zone. The observation results show that the overburden damage by full-mechanized top-coal caving mining of very thick seam is more serious than other mining methods; there are lots of large cracks and separation space in fractured zone; the ratio of the height of the fractured zone to the mining height is 12.53; based on the observation results, combination of mechanical analysis and numerical simulation methods, shows the distribution pattern and the maximum height of the fractured zone. With the depth of surface cracks, provide the calculating formulae of water proof coal (rock) pillar height in Beirui river of Huating coal mine.Research results establish the base for further study in fractured zone of full-mechanized top-coal caving mining of very thick seam. It proves to possess extension application value in underwater mining of Huating coal mine.
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