Research on the application of dynamic weighting on the rock mass quality rating

Many rock mass classification systems have been proposed for rock masses by considering a particular rock structure and/or specific purposes. The traditional rock mass quality rating system ignores the impact of uncertainty, complexity, and ambiguity on the classification of tunnels surrounding rock masses. The calculation of the traditional weighted values only addresses the selection of the evaluation index rather than self-adjustment with changes to the total weight. To solve this issue, the dynamic weight and extension methodology are introduced to improve the evaluation of rock quality. The sample grade can be evaluated by calculating the variable eigenvalue of the object grade. This method can avoid disadvantages that occur during the calculation of the weight value. Additionally, it can fully reflect the impact of the rock mass when the same factor has different data for the evaluation, making the results more reasonable. Therefore, it can avoid the subjectivity of the evaluation process and make the evaluation results more reasonable. Finally, the results from studies of tunneling projects show that factors affecting the weight value have a dynamic property. Even if the evaluation factors are same, the weight value will alter the values of the factors.