Risk Evaluation of Roof Water Inflow (Inrush) and Prevention and Control Measures in Early Mining Areas of Balasu Coal Mine

The coal mines in Jurassic coal field in northern shaanxi have been seriously affected by the water damage on the roof of coal seam for many years. In order to effectively curb this threat of such water hazards, taking the early mining areas of Balasu Coal Mine as an example, combined with the multiple geoscience information, such as the thickness, the adoption rate of the cores, the permeability coefficient, the specific yield of the water filling aquifers, and the results of geophysical exploration engineering, etc., by using the “three-graphic two-prediction method”, through the overlay analysis, the comprehensive partition map of the coal seam roof water inflow (inrush) conditions is obtained. The study showed that the water of Zhiluo Formation aquifer is the main water filling source for the future exploitation of the whole study area, and the relative water rich regions are distributed in midwestern and eastern of the study area, these are also the roof water inflow(inrush) threat areas. Aiming at the problems that the mine water hazards will be faced with in the future, the relevant reasonable and effective prevention and control measures are proposed.