Abstract:According to the characteristics of uncertainty and randomness in the risk assessment of tailings dam break, a comprehensive assessment model based on game theory and variable fuzzy set is established by introducing variable fuzzy set. Firstly, considering the form of tailings dam break, 17 indicators are selected to build a comprehensive evaluation index system; secondly, the subjective and objective weights of indicators are determined by using the improved analytic hierarchy process (AHP) and the coefficient of variation method, and the comprehensive weights of indicators are calculated based on the game theory, and the risk level of tailings dam break is determined by determining the relative membership function and comprehensive eigenvalue of single indicator; finally, the risk level of tailings dam break is determined Then, the evaluation model is applied to the risk assessment of tailings dam break in a metal mine, and the results are compared with the cloud model and unascertained measurement theory. The research shows that the evaluation results of the comprehensive evaluation model established in this paper are reasonable and reliable, consistent with the actual situation, which can provide a new method for the risk assessment of tailings dam break.