Evaluation of Water Inrush Hazard in Coal Seam Roof Based on the AHP-CRITIC Composite Weighted Method

The more complex the hydrogeological conditions of a mine, likely coal seam is to experience water inrush during mining process, and greater degree hazard. scientific reasonable prediction in mines with great significance safe efficient operation mines. Taking roof problem No. 3 lower Jisan Coal Mine as research object, factors affecting were comprehensively considered from three aspects: aquifer property, fracture development geological structure. evaluation index system was constructed by selecting 10 factors, including depth thickness, core recovery rate, brittle–plastic rock thickness ratio, number water-resisting layers, height water-conducting zone, fault density, frequency scale variation coefficient floor dip angle. At same time, based on dual influence subjective objective weighting, weight each factor ensured. AHP-CRITIC composite weighting method used calculate comprehensive factor. Finally, risk model constructed. According results, study area divided into low-risk area, medium-risk high-risk area. Compared actual situation, results basically consistent can provide basis for prevention control mine.