## 3 Example Test and Result Analysis
### Test Results and Analysis
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Angle of View**} & \multirow{2}{*}{\begin{tabular}{c} **Flag Point** \\ **Number** \\ \end{tabular} } & \multirow{2}{*}{\begin{tabular}{c} **X Coordinate/m** \\ **X Coordinate/m** \\ \end{tabular} } & \multirow{2}{*}{\begin{tabular}{c} **Y Coordinate/m** \\ **Z Coordinate/m** \\ \end{tabular} } \\ \hline \multirow{6}{*}{\
\begin{tabular}{c} Right \\ perspective \\ \end{tabular} } & C1 & 4.63 & 5.61 & 2.45 \\  & C2 & 1.34 & 6.88 & 2.76 \\  & C3 & 5.88 & 5.01 & 1.38 \\  & C4 & 3.46 & 1.17 & 0.75 \\  & C5 & 3.75 & 2.46 & 1.53 \\  & C6 & 2.83 & 1.52 & 3.47 \\  & C7 & 6.04 & 4.42 & 4.15 \\  & C8 & 4.82 & 3.43 & 3.82 \\ \hline \multirow{6}{*}{
\begin{tabular}{c} Lower \\ perspective \\ \end{tabular} } & D1 & 0.93 & \(-\)3.54 & 0.85 \\  & D2 & 2.08 & \(-\)4.31 & 0.12 \\  & D3 & 2.96 & \(-\)5.84 & 0.36 \\  & D4 & 4.71 & \(-\)6.64 & 0.04 \\  & D5 & 7.33 & \(-\)7.97 & 0.13 \\  & D6 & 10.27 & \(-\)9.07 & 0.26 \\  & D7 & 10.92 & \(-\)9.58 & 0.92 \\  & D8 & 13.33 & \(-\)15.4 & 0.47 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: _Cont._  
Figure 3: Point cloud splicing results. The method in this paper was used to monitor tunnel invert uplift deformations in the K13 + 060\(-\)K13 + 170 section. The monitoring results of the tunnel invert uplift deformation are shown in Figure 5.  
According to Figure 5, this method can effectively monitor the uplift deformation of the inverted arch of the soft rock tunnel. According to the deformation monitoring results, the middle uplift deformation of the inverted arch of the soft rock tunnel is the largest and the maximum uplift deformation is about 0.45 m in the K13 + 60\(-\)K13 + 170 section. The uplift deformation on the left side of the inverted arch is the smallest and the maximum uplift deformation is about 0.04 m in the K13 + 70\(-\)K13 + 160 section. The uplift deformation of the right side of the inverted arch is also small and the maximum uplift deformation is about 0.07 m in the K13 + 80\(-\)K13 + 160 section. By comparing the deformation of the left, middle and right inverts of the tunnel, it can be seen that the overall deformation of the invert is large in the middle, followed by the deformation of the right side, and the deformation of the left side is the smallest, which indicates that the invert area on the left side of the tunnel is the least affected. Thus, this deformation may be caused by some asymmetric geological structure. Experiments show that this method can effectively monitor the uplift deformation of inverted ar  
Figure 4: Splicing point cloud denoising results. Figure 5: Deformation monitoring results of tunnel invert uplift. The method in this paper was used to monitor the uplift deformation of the inverted arch of the soft rock tunnel in the K13 + 060\(-\)K13 + 170 section at different grouting depths. The uplift deformation monitoring results are shown in Figure 6.  
According to Figure 6, the method in this paper can still effectively monitor the uplift deformation of the inverted arch in soft rock tunnels at different grouting depths. The monitoring results show that the uplift deformation of the inverted arch is basically the same at different grouting depths, and there is only a slight change at the section with the largest deformation, indicating that the effect of grouting reinforcement at the arch bottom is not significant. If the grouting depth is not sufficient, the grouting effect is not good. As a result, the strength and bearing capacity of the rock mass after grouting cannot be significantly improved, stress release after excavation cannot be effectively suppressed, the strengthened surrounding rock will still produce plastic deformation, and the suppression of the floor invert uplift will not be greatly improved. In order to verify the effectiveness and correctness of the application of the method in this article, a comparison was made between the method in reference [6] ([PERSON], [PERSON], et al.) and the method in reference [7] ([PERSON] al., 2022).