WATER RICH CHARACTERISTICS OF AQUIFER AND DETERMINATION OF MINE WATER QUALITY AFTER PIT CLOSURE IN NORTHERN SHAANXI MINING AREA

摘要

With the increase of mining depth and the extension of mining level, the hydrogeological conditions are more complex, the water head pressure of the floor water filled aquifer with supply conditions is more and more large, and a series of problems such as the connection of mining coal seam and thick limestone caused by regional fault seriously restrict the environmental safety. Therefore, in the actual production process, it is of great practical significance to grasp the water rich distribution law of the water filled aquifer and predict the water drainage of the coal seam floor to ensure the effective prevention and control of mine water disaster and the safe mining of coal. According to the type and characteristics of coal mine water filled aquifer, in the case of lack of hydrogeological drilling this paper establishes a set of relatively systematic evaluation index system of coal mine water filled aquifer's water yield, and applies PNN neural network theory and method to establish a new practical model conforming to the water yield law of the aquifer to study the water filled aquifer's water yield in the study area Make new comments. The results show that the coupling model based on the distribution of sedimentary (microfacies) and PNN neural network is more accurate than the traditional information fusion method. Therefore, this evaluation method is reasonable and effective in the evaluation of water yield of sandstone fracture aquifer in Zhiluo formation.