## 4 Summary  
In this paper, ANSYS/LS-DYNA are used to study the impact of blasting the subsequent tunnel on a steel fiber tunnel lining in advance. By establishing three tunnel models of plain concrete, ordinary reinforced concrete, and steel fiber, and comparing the explosive quantities in the blasting of the subsequent tunnel, the following conclusions are drawn:  
1. With plain concrete lining, the peak value of the vibration velocity at each monitoring point appears to be around 0.03 s and increases with the explosive quantity. With the velocity curve basically symmetrical around 0.03 s, it demonstrates consistency in the vibration law. 2. With ordinary reinforced concrete lining, the overall vibration speed is basically the same as that of plain concrete, but increases as a result of the integrity after adding reinforcement. 3. The biggest difference between the steel fiber and the plain concrete tunnel lining is at the right arch waist. The vibration velocity at the right waist increases with the number of explosives, but in the steel fiber tunnel, the vibration velocity at the right arch waist increases and then decreases, with the vibration trend consistent with the other two monitoring points. 4. By comparing the peak values of the vibration velocity at each monitoring point of the three kinds of tunnel lining, it can be concluded that the ordinary reinforced concrete lining at the right wall has the largest vibration velocity; the maximum vibration velocity of the steel fiber tunnel lining occurs at the right arch spandrel, and the gap is large; the maximum vibration velocity of steel fiber tunnel lining is at the right arch waist. Therefore, the integrity of steel fiber tunnel lining is better than the other tunnel linings, with a relatively larger vibration velocity. 5. In conclusion, the steel fiber-reinforced concrete tunnel lining has better integrity compared to plain concrete and reinforced concrete tunnel linings. Therefore, the use of steel fiber-reinforced concrete lining in blasting construction is feasible and can effectively reduce the adverse impact on adjacent tunnels. However, there is  
Figure 12: Steel fiber concrete tunnel right arch waist vibration speed curve. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Location**} & \multicolumn{2}{c}{**Quantity of**} & \multirow{2}{*}{**14.4**} & \multirow{2}{*}{**18**} & \multirow{2}{*}{**21.6**} & \multirow{2}{*}{**25.2**} & \multirow{2}{*}{**28.8**} \\  & **Explosive (kg)** & & & & & \\ \hline Right side wall & Peak (m/s) & 0.00195 & 0.00198 & 0.00212 & 0.00222 & 0.00301 \\ Right spandrel & Peak (m/s) & 0.00667 & 0.00671 & 0.00695 & 0.00731 & 0.00832 \\ Right arch waist & Peak (m/s) & 0.00220 & 0.00179 & 0.00232 & 0.00186 & 0.00177 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Peak particle velocity and position of vibration velocity with the same explosive quantity. a limitation in data on steel fiber-reinforced concrete as tunnel lining in practical engineering. Conceptualization, L.-M.W. ; formal analysis, Z.-J.W. ; investigation, Y.-Z.C. and Y.W. ; methodology, L.-M.W. ; software, H.-X.F. ; supervision, B.Z. ; validation, F.G.; writing--original draft, L.-M.W. ; writing--review and editing, Y.-Z.C. All authors have read and agreed to the published version of the manuscript. This work was sponsored by the Natural Science Foundation of Chongqing, China (Grant No. CSTB2022 NSCQ-MSX0975), Key Laboratory of Geological Hazards Mitigation for Mountainous Highway and Waterway, Chongqing Municipal Education Commission Chongqing Jiaotong University (Grant No. kfkm2018-06), Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN20210156 and KJZD202204001), Key Scientific Research Projects of Chongqing Technology and Business Institute (Grant No. NDZD2021-03), Steering Science and Technology Plan Project of Civil Engineering Architectural Network of University Chongqing (Grant No. 2022A04, 2022B05, 2022B09, 2023A03, 2023B03, 2023B04 and 2023B05). Not applicable.