## 6 Conclusions  
In this paper, based on the actual construction process of the tunnel drilling and blasting method, the excavation ergonomics evaluation index system of the tunnel drilling and blasting method is built, a comprehensive evaluation model of the game theory G2-EW-TOPSIS is established, and two types of construction methods of two construction objects are selected for the calculation of the case analysis, and the following conclusions are obtained:  
1. Game-theory-combined weighting overcomes the limitations of the subjective and objective evaluation methods. In Figure 9, we can see clearly that the curve of the game theory combination weighting method is in the middle of the other two curves. Whenever the G2 method or EWM has a minimum or maximum weight, the game theory combination weighting will correct it. The curve after linear weighting is closer to the real result, which effectively solves the limitations of the G2 method and EWM. Meanwhile, the concept of the relative closeness degree in thet TOPSIS method \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Construction** & **Construction** & \(\mathbf{D_{i}^{+}}\) & \(\mathbf{D_{i}^{-}}\) & \(\mathbf{C_{i}}\) & **A** & **Evaluation** & **Excavation** \\
**Objects** & **Method** & \(\mathbf{D_{i}^{+}}\) & \(\mathbf{D_{i}^{-}}\) & \(\mathbf{C_{i}}\) & **A** & **Level** & **Ergonomics Grade** \\ \hline \multirow{3}{*}{Large mileage} & JD excavation & 0.23 & 0.67 & 0.75 & 777.93 & I & I \\  & DM excavation & 0.68 & 0.22 & 0.24 & 980.28 & V & V \\ \multirow{3}{*}{Small mileage} & JD excavation & 0.27 & 0.63 & 0.70 & 877.00 & II & III \\  & DM excavation & 0.60 & 0.32 & 0.35 & 880.66 & III & III \\ \hline \hline \end{tabular}
\end{table} 
Table 11: Drilling and blasting method of excavation ergonomics relative proximity calculation results. is introduced to represent the evaluation level, so that the evaluation level can be quantified and expressed more clearly. 2. Regarding the weighting proportion of the evaluation index system, the top five factors were construction quality A31, comprehensive cost A33, auxiliary eye drilling efficiency A13, trenching eye drilling efficiency A12, and drilling time A22. Among them, the construction quality remains a concern throughout the entire project life cycle. During the actual construction of the tunnel, the construction quality affects the construction progress, and if the construction quality is too low, it is necessary to reconstruct or take remedial measures, which is not only time-consuming and laborious, but also causes a waste of resources. Therefore, construction quality is one of the core indicators of concern in the tunnel construction process, which is in line with the actual needs of current tunnel construction and further illustrates the effectiveness of the combined weighting model proposed in this paper. 3. According to Table 11, in both large- and small-mileage construction, the JD excavation is rated no less than the DM excavation in terms of evaluation level and the excavation ergonomics grade. In the large-mileage construction, the evaluation level and ergonomics grade of the JD excavation are higher than those of the DM excavation. Among them, the evaluation level of the JD excavation is Grade I, that is, excellent. The evaluation level of the DM excavation is Grade V, that is, poor. In addition, the excavation ergonomics level of the JD excavation is Grade I, that is, excellent. The excavation ergonomics grade of the DM excavation is Grade V, that is, poor. In the small-mileage construction, the evaluation level and ergonomics grade of the JD excavation are higher than those of the DM excavation. Among them, the evaluation level of the JD excavation is Grade II, that is, good. The evaluation level of the DM excavation is Grade III, that is, average. In addition, the excavation ergonomics grade of the JD excavation is Grade III, that is, average. **Author Contributions:** Conceptualization, C.Y. and Y.T. ; methodology, C.Y. ; software, C.Y. and R.H.; validation, R.H., W.Q. and R.Z.