Comparison of different scale indicators and verification of rock mass classification

The basic principle of fuzzy comprehensive evaluation is introduced, and different scales of determining indicator weights using Analytic Hierarchy Process (AHP) are summarized and organized. The inspection indicators for evaluating the quality of the judgment matrix are provided. Taking the underground station of a planned intercity railway as the engineering background, a comparative study is conducted on the advantages and disadvantages of the indicator judgment matrix and the comprehensive evaluation results about an scale, 10/10~18/2 scale, 9/9~9/1 scale, 1~9 scale. The results show that the consistency of the judgment matrix constructed by 1-9 scale is poor and may lead to incorrect evaluation results. The consistency of judgment matrix constructed by an scale is optimal and the fuzzy comprehensive evaluation results are the closest to the actual situation. It can provide useful guidance for the classification work of surrounding rocks in underground engineering projects.