Abstract: Variable fuzzy comprehensive evaluation model of mine goaf surrounding rock stability which take level characteristics value as criterion was built by using variable fuzzy sets theory, evaluation indicators which effect the stability of goaf surrounding rock and stability grading standards were discussed. Comparison validation analysis was done on results of stability evaluation combined with goaf of orebody No.L-7 of Yueshan copper mine. The results indicate that under three kinds of weight vector, the level of the big goafs A and B was belong to level three, the surrounding rock stability of this goaf was level three (the stability was serious); the level of the big goaf E was belong to level two, surrounding rock stability of goaf was level two (the stability was basically stable). Aimed at the evaluation results and connected with practice, preliminary schemes to deal with the goaf were proposed.

Key words: Variable fuzzy sets, Stability of mined-out area, Comprehensive evaluation model