Abstract
Coal mine floor water inrush disasters triggered by deep mining of coal seams occur frequently, and the traditional water inrush risk evaluation methods are far from being able to meet the actual mining situation, with numerous new evaluation methods emerging continuously. The main control index evaluation system was based on the constant weights calculated by AHP method and CRITIC method, and the variable weight theory was applied to determine the variable weights of each index factor; the mathematical methods of weighted rank-sum ratio(WRSR) method and Grey-TOPSIS method were introduced and combined with the variable weight model, to establish the floor water inrush risk evaluation model based on the variable weight theory, and to draw the water inrush evaluation risk zoning map. Combined with the actual mining situation, the two mathematical evaluation methods based on variable weight theory obtained more accurate evaluation results, and compared with the method of water inrush coefficient, the diversification of index factors weakened the absolute control effect of water inrush threshold, made the evaluation results more systematic and comprehensive, provided a new method and a new way of thinking for the deep mining of the coal seam.