基于GIS与熵值法的煤层顶板突水危险性评价

为了对丁集矿13-1煤层顶板突水危险性进行合理的评价，探讨岩芯采取率、含水层厚度、脆塑性岩厚度比、隔水层厚度、断层影响带高度、渗透系数、断层分维7个影响顶板含水层富水性的主控因素，采用了GIS建立各主控因素专题图，然后运用熵值法确定各主控因素的权重，并对数据进行归一化处理，叠加各主控因素的归一化数据和权重值，获得富水性指数评价模型并建立富水性分区图，再计算顶板导水裂隙带高度和建立顶板冒裂程度分区图，最后分别对富水性分区和顶板冒裂程度分区重新赋值，对赋值后的两个图进行复合叠加，获得顶板突水危险性分区图。结果表明，评价结果与实际基本一致，准确性较高，可以为矿井顶板水害的防治提供参考依据。

Risk Assessment of Water Inrush from Coal Seam Roof Based on GIS and Entropy Method

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.