Comprehensive Evaluation of Water-inrush Risk from Coal Floor

Based on the complexity of water inrush risk for coal seam floor,a comprehensive evaluating method will be put forward to estimate the floor water inrush risk in the western mining area with the help of coupling technique of GIS and entropy.After analyzing the data collected from hydrological geology,engineering geology,mining and exploration of a mine in Shandong province,taking the spatial analyzing function of the various factors of the geographic information system(GIS) as the operating platform and combining the method of entropy model to determine the weighted percentage of each factor,the evaluation model will be established through combing GIS and entropy coupling according to the main factors influencing on the protective exploit of water resources such as the fault structure,thickness of the overburden rock,water-hearing capability of the key aquifer,thickness of the seam mining.The result indicates that water-inrush risk index method has distinct predominance over water-inrush coefficient method.