## 3 Case Study
### Data Statistic  
This paper relies on the construction project of the drilling and blasting method in Shangtianling Tunnel. Field research is carried out to obtain actual construction data according to the index system established in this paper. 1. Drilling efficiency includes: perimeter eye drilling efficiency, trenching eye drilling efficiency, auxiliary eye drilling efficiency, and bottom plate eye drilling efficiency. The drilling efficiency of drilling and blasting excavation construction by JD drill is shown in Table 3.
2. The total time of excavation by the drilling and blasting method in Shangtianling Tunnel includes: measurement time, preparation time, drilling time, and charging time. The statistics of the construction cycle time for large mileage are shown in Figure 4a,b, and the statistics of the construction cycle time for small mileage are shown in Figure 4c,d. Among them, each of measurement time, drilling time, charging time, and preparation time were counted. In the construction of the large-mileage JD drilling and blasting method, mileage DK111+042-DK111+487 was selected from 28 September 2021 to 13 January 2022, and the statistics of 110 sets of data are shown in Figure 5. In the construction of the large-mileage DM drilling and blasting method, mileage DK111+632-DK112+023 was selected from 26 April 2022 to 14 August 2022, and the statistics of 110 sets of data are shown in Figure 6. In the construction of the small-mileage JD drilling and blasting method, mileage DK109+285-DK109+734 was selected from 16 January 2022 to 29 April 2022, and the statistics of 110 sets of data are shown in Figure 7. In the small-mileage DM drilling and blasting method construction, we selected the DK109+742-DK110+169 mileage, from 2 October 2021 to 11 January 2022, and the statistics of 110 sets of data are shown in Figure 8. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Construction Objects**} & \multirow{2}{*}{**Construction Method**} & \multicolumn{3}{c}{**Average Single – Hole Drilling Time (min)**} \\ \cline{3-5}  & & **Perimeter Eye** & **Trenching Eye** & **Auxiliary Eye** & **Bottom Plate Eye** \\ \hline \multirow{2}{*}{Large mileage} & JD excavation & 2.7 & 3.0 & 2.7 & 2.7 \\  & DM excavation & 15 & 15 & 17 & 15 \\ \multirow{2}{*}{Small mileage} & JD excavation & 2.7 & 3.0 & 2.7 & 2.7 \\  & DM excavation & 15 & 15 & 17 & 15 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Drilling efficiency statistics. In summary, the average time for each phase of the drilling and blasting excavation is shown in Table 4. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{3}{*}{\begin{tabular}{c} **Construction** \\ **Objects** \\ \end{tabular} } & \multirow{3}{*}{\
\begin{tabular}{c} **Construction** \\ **Method** \\ \end{tabular} } & \multicolumn{3}{c}{**Average Duration (min)**} \\ \cline{3-5}  & & **Measurement** & **Measurement** & **Measurement** & **Measurement** \\  & & **Time** & **Time** & **Time** & **Time** \\ \hline \multirow{3}{*}{
\begin{tabular}{c} Large mileage \\ \end{tabular} } & JD excavation & 59.2 & 160.7 & 165.2 & 18.6 \\  & DM excavation & 58.1 & 258.3 & 62.9 & 32.3 \\ \cline{1-1}  & JD excavation & 60.1 & 173.1 & 103 & 17.2 \\ \cline{1-1}  & DM excavation & 57.2 & 211.0 & 60 & 30.3 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Average time spent in each phase of tunnel construction by drilling and blasting method. Figure 4: Drilling and blasting method excavation cycle statistics time: (**a**) the statistics of the large–mileage JD construction cycle time; (**b**) the statistics of the large–mileage DM construction cycle time; (**c**) the statistics of the small–mileage JD construction cycle time; and (**d**) the statistics of the small–mileage DM construction cycle time.