Rock Mass Classification Method Based on Entropy Weight-TOPSIS-Grey Correlation Analysis

The accurate and reliable classification of rock mass is the basis of a reasonable engineering design. In the Xishan mining region of Sanshandao Gold Mine, three conventional rock mass classification methods of Tunneling Quality Index (Q), Rock Mass Rating (RMR) and China National Standard-basic quality (BQ), were compared in the burial depth area above 780 m, and it was discovered that the classification results of different rock mass classification methods had a low coincidence rate in the deep area; Therefore, this paper adopted entropy weight method, TOPSIS method and grey correlation analysis method to calculate the entropy weight and relative closeness of different methods in different middle sections. The study's findings revealed that in the deep area, the relative closeness between each classification mass was: RMR > Q > BQ; Based on the above results, the IRMR method with modified RMR was selected for comprehensive analysis, and the concept of importance degree of evaluation index was defined; it was found that the importance degree of evaluation index of in-situ stress loss was the highest, while the importance degree of joint direction was the lowest; The ETG rock mass classification method based on site-specific is established, which provides a reference for the establishment of deep rock mass classification method.

Automated summary

This study compared the classification results of different rock mass classification methods in the deep area and found differences in their relative closeness. Using various methods, the entropy weight and relative closeness of each method were calculated, and the IRMR method was selected for comprehensive analysis based on the results. The importance degree of evaluation index was defined, and the study provided a reference for establishing a deep rock mass classification method.