## 5 Analysis of Test Results
### Explosion Pressure  
The explosive pressure can reflect the explosive load acting on the anchored cavern soil medium. In this field test, three pressure sensors were installed at different positions of each test section, and the normal direction of each pressure sensor's pressure-bearing surface is vertical, so the pressure measured is all in the vertical direction. This article focuses on the comparative analysis of the pressure measurement data of the crown, 1/2 arch waist, and arch foot positions. The vertical pressure comparison of these positions under different conditions is shown in Figures 14-16. As shown in Figure 14 and Table 3, the stress peak value of the top of the cavern for the conventional steel-bolt-reinforced test section is higher than that of the RDEA-bolt-reinforced test section for each test condition: Taking the third condition test with an explosive charge amount of W = 10 kg as an example, the stress peak value at the top of the RDEA-bolt-reinforced test section is 0.131 MPa, while that of the conventional steel-bolt-reinforced test section is 0.556 MPa, which is approximately 4.24 times that of the RDEA-bolt-reinforced test section (the crown pressure of the RDEA-bolt-reinforced test section is 76.4% lower than that of the conventional steel-bolt-reinforced test section \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Test Section**} & \multicolumn{2}{c}{**Peak Displacement at the Arch Crown/mm**} & \multicolumn{2}{c}{**Total Residual**} \\ \cline{2-5}  & **Condition 1** & **Condition 2** & **Condition 3** & **Displacement Value at the** \\  & **(W = 4.8 kg)** & **(W = 7.8 kg)** & **(W = 10 kg)** & **Arch Crown/mm** \\ \hline RDEA-bolt-reinforced test section & 1.726 & 3.680 & 6.370 & 7.344 \\ \hline Conventional steel-bolt-reinforced test section & 2.893 & 4.406 & 13.694 & 16.755 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Statistical table of peak displacement and total residual displacement value at the arch crown. after the third condition test). This phenomenon reflects the good energy dissipation characteristics of the RDEA bolt compared to the conventional steel bolt. At the same time, it also indicated that the anchor type has a significant impact on the variation law of explosive loads in the anchoring area with different structural forms of anchor bolts. Compared with the conventional steel-bolt-reinforced test section, when the limit anchoring force of the conventional reinforced rebar anchor and the RDEA bolt is roughly equivalent, the weakening effect of the RDEA-bolt-reinforced test section on the explosive load is mainly due to the shear friction energy dissipation of internal No. 3 shear slid block on No. 4 internal threads under the action of explosive pressure, which can effectively attenuate the explosive load acting on the anchoring area and achieve energy absorption effect. As shown in Figures 14-16, the vertical pressure waveforms of the crown, \(1/2\) arch waist, and arch foot positions of the two test sections are different, and the vertical pressure at each measurement point in the RDEA-bolt-reinforced test section is significantly lower than that in the conventional steel-bolt-reinforced test section. The waveforms of the pressure measurement points at the \(1/2\) arch waist and arch foot positions of both test sections  
Figure 14: Comparison diagram of arch crown pressure in different test sections under different explosion loads: (**a**) conventional steel-bolt-reinforced test section and (**b**) RDEA-bolt-reinforced test section. Figure 15: Comparison diagram of \(1/2\) arch waist pressure in different test sections under different explosion loads: (**a**) conventional steel-bolt-reinforced test section and (**b**) RDEA-bolt-reinforced test section.