Abstract
Water-inrush accidents often occur when coal seams are mined with thin water-resisting layer and high confined water. To prevent water-inrush from coal seam floor, based on the analysis of the characteristics of Ordovician limestone (OLS) karst in Feicheng mining area, a series of key technologies or methods for OLS aquifer were studied in this paper. First, the grouting area of the working face floor was determined by the water-inrush coefficient. According to the given formula of water bursting coefficient, the formula for calculating the thickness of reinforced aquifers by grouting was deduced. Second, the ‘three-stage casing’ drilling with small angle was designed for fully grouting in the OLS. Finally, the 3D DC mine resistivity method was used to check the effect of grouting for the working face to ensure the grouting quality of the floor. Through the case study, it shows that the technology elaborated has better practicability and popularization.
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