Analysis on Causes of Large-scale Ordovician Karst Water Inrush at 27080 Working Face of Eastern Caoyao Mine

概要

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The large-scale Ordovician Karst water　inrush occurred at 27080 working face in　Caoyao Eastern Mine on　December 23th, 2006, the maximum water inflow arrived at 1693 cubic meters per hour. The source of thiswater inrush was the Ordovician karst water; the dynamic condition was high hydraulic pressure; the water　conducted channels were formed by hydraulic pressure and rock pressure in the weak area of floor; and thespace of that was offered by excavation. The proposals for preventing and controlling water were put forward.