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The Comprehensive Safety Evaluation Method on the Safety Situation of Iron Mine Based on AHP and Extension Theory

To solve the qualitative and quantitative problems in safety evaluation, we employ the professional knowledge of extension engineering method, analytic hierarchy process (AHP) and relevant iron mine safety evaluation index system, combined with extension engineering method and regional safety assessment to establish the matter-element model of safety evaluation analysis on iron mine safety based on extension theory. Based on the safety data of iron mines, we further analyze the influential factors of the regional safety. Firstly, these influential factors are divided into two levels based on AHP, and then the weights of two layers index are calculated respectively. Secondly, with scores measured by experts, the safety level of the influencing factors is determined based on extension theory. Finally, given the weight and safety level of the influence factors mentioned above, the safety conditions of iron mine is determined accordingly. The results of the study show that this analysis based on AHP-the extension engineering method absorb the essence of the traditional evaluation method, and minimize the defects of the various methods. The method can accurately evaluate safety level of iron mine, measure the distance between the actual safety level and adjacent safety level, and better reflect iron mine safety situation. It is of certain significance for the classification of safety situation. The method also has a broad application prospects in other engineering fields.