The Characteristics of Karst and Karst Water Hazards in Coal Mining Areas in North China

Abstract

Abstract The characteristics of stratum distribution, karst evaluation and karst controlling factors in coal mining areas in North China were comprehensively studied and analyzed.The karst characteristics and the distribution of exposed karst ,shallow buried karst and deep buried karst were given. The relationship among geological structure controlling groundwater, groundwater circulation and the characteristics of Ordovician limestone karst was studied.The distribution characteristics of development types and water abundance of Ordovician limestone karst were obtained. The spatial relationship between major coal seams and Ordovician limestone karst aquifer, the main controlling factors of mine water hazards were studied. From the abundance water-charging sources, the capacity of water inrush-resisting of impermeable layers in seam floor, the geological formation of vertical karst and the development characteristics of water-conducting structures, evaluation of risk zonation of mine karst water hazards in coal mining areas in North China was put forward, providing important scientific basis for water hazard evaluation and control in mining deep coal resources in North China