Abstract: To accurately assess the wear risk of backfilling pipeline,a variable-weight-fuzzy multidimensional evaluation model was built on the basis of the variable weights theory, set pair analysis and triangular fuzzy number theory. For building the model, an index system for risk assessment was established and the weights of evaluation samples were determined by variable weights theory. Set pair analysis was used to construct a multi-contact number expression of the evaluation index and triangular fuzzy number was introduced to express the interval representation of the otherness coefficient. The number of integrated connections was calculated to get the risk assessment level. The validity of the model was verified by an example and the wear risk of the backfilling pipeline in the Sanshandao gold mine was evaluated. The results show that the wear risk grade of the backfilling pipeline is grade Ⅲ (general wear)and the wear risk of the backfilling pipeline is the biggest when the artificial floor is under construction in the Sanshandao gold mine, and that the outcomes of this model are in agreement with the reality and the risk of backfilling pipeline can be assessed from a multidimensional angle.

Key words: backfilling pipeline wear, set pair analysis, triangular fuzzy number, variable weights theory, risk assessment