关键词: GIS, 熵值法, 顶板突水, 顶板含水层富水性, 突水危险性

Abstract: In order to reasonably evaluate the risk of water inrush from the roof of 13-1 coal seam in Dingji Coal Mine.Discussing seven main controlling factors including core recovery rate, aquifer thickness, brittle-plastic rock thickness ratio, thickness of aquifer, height of fault influence zone, permeability coefficient and fractal dimension of fault as the main control factors affecting the water-rich of roof aquifer, and we use the spatial analysis function of GIS to build thematic maps of each main control factor. Then this paper employ the entropy method to determine the weight of each main control factor and normalize the data, and superimpose the normalized data and weight values of each main control factor with that obtaining the evaluation model of water-rich index and establish water-rich zoning map, and then calculate the height of water-conducting fracture zone after that the zoning map of roof fracturing degree are established. At last, the zoning map of roof water inrush risk has been obtained by combining and superimposing with the above two zoning maps. The results show that the evaluation results are basically consistent with the actual situation, and the accuracy is high, which can provide a reference for the prevention and control of mine roof water hazards.