Abstract:It is of great significance to develop a new model of goaf stability evaluation for improving the reliability of goaf stability evaluation and ensuring the safety of underground mine. The evaluation indices for goaf stability is built through selecting four factors as the main influencing factors which includes engineering geological environment, rock mass quality, geometric parameters and surrounding rock stress of goaf. Based on the principle efficacy coefficient method, using the three-scale improved analytic hierarchy process (AHP)to calculate the weight coefficient of evaluation indices, a new model of goaf stability evaluation is established. Then the model is employed to evaluate the goaf stability in Panlong lead-zinc underground mine. The evaluation results are in good agreement with the actual situation, which verified the feasibility and reliability of the newly established evaluating model based on efficacy coefficient method. Thus the study provides a new approach for goaf stability evaluation.