Risk Assessment Method of Goaf Water Hazard in Coal Mine: Application of GIS-based AHP Vulnerability Index Method

Abstract

To solve the difficulties with predicting and evaluating the goaf water hazard in coal mines, taking the goaf water hazard of one certain coal mine in Shuicheng County, Guizhou Province as the research object, the newly proposed GIS-based AHP vulnerability index method was applied in this paper, on the basis of the proposed master control index system of goaf water and the vulnerability index method. Through the detailed analysis of the geological condition, hydrogeological condition and goaf water hazards law of the mining area, the 12 main control factors affecting the goaf water hazards in the coal mines were determined. Then, the powerful data management and spatial analysis functions of GIS were applied to build the thematic maps and hierarchical graphs of the 12 main control factors for the goaf water hazards in coal mine. The AHP method was adopted to determine the weight contribution of each main control factor in forming goaf water hazards in coal mines. In this way, one GIS-based AHP vulnerability assessment model of goaf water in coal mine was constructed. Finally, according to the vulnerability index statistical chart of coal mine goaf water hazard obtained, the zoning threshold of goaf water hazard vulnerability was determined and analyzed, which was used to make zoning of the goaf water hazards and obtain the prediction map of coal mine water hazards, thus eventually achieving the zoning features of goaf water hazards in coal mines.