## 5 Analysis of Test Results
### The Acceleration of the Cave Wall  
The cavern wall acceleration can reflect the speed and stability of the surrounding rock vibration. Excessive acceleration indicates that the rock vibration is too fast, which can weaken the stability of the cavern. Therefore, it is necessary to measure the cavern wall acceleration. Three acceleration measurement points were installed in the center cross-section of each test section, located at the crown, sidewall center, and bottom plate, as shown in Figure 9. The waveform of the acceleration measurement points of each test  
Figure 16: Comparison diagram of arch foot pressure in different test sections under different explosion loads: (**a**) conventional steel-bolt-reinforced test section and (**b**) RDEA-bolt-reinforced test section. \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Test Section**} & **Monitoring Point** & \multicolumn{3}{c}{**Peak Pressure/MPa**} \\ \cline{3-4}  & **Number** & **Condition 1 (W = 4.8 kg)** & **Condition 2 (W = 7.8 kg)** & **Condition 3 (W = 10 kg)** \\ \hline RDEA-bolt-reinforced test section & P11 & 0.031 & 0.065 & 0.131 \\ \hline Conventional steel-belt-reinforced test section & P12 & 0.034 & 0.043 & 0.070 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Peak value statistics table of pressure-measuring points in different test sections. section under the three test conditions is shown in Figure 17, and the peak accelerations at each measurement point of the two test sections under different conditions are detailed in Table 4.  
As given in Table 4, as the explosive charge amount increases from the first test condition to the third, both test sections exhibit the largest acceleration at the arch crown position, followed by the sidewall center position, and the bottom plate has the smallest acceleration. The reason for this phenomenon was that the stress waves generated by the explosion propagate downward, and the main direction of the explosive pressure is downward. Additionally, the acceleration of the bottom plate was affected by diffraction as it passes through the cavern and interacts with the surrounding rock, resulting in a decrease in the strength of the explosive stress wave as it propagates downward. Therefore, the acceleration at the arch crown and sidewall center positions was relatively larger, while the bottom plate acceleration was relatively smaller. The peak acceleration at the arch crown position of both test sections is positive, and in all three test conditions, the conventional steel-bolt-reinforced test section exhibited larger acceleration at the arch crown position than the RDEA-bolt-reinforced test section, with the arch crown acceleration of the conventional steel-bolt-reinforced test section in the third test condition being approximately 1.35 times that of the RDEA-bolt-reinforced test section. The main reason for the larger acceleration at the arch crown position of the conventional steel-bolt-reinforced test section was that its injection method was full-length bonding, which made the particles of the surrounding rock at the arch crown more firmly bonded and the integrity stronger, resulting in a larger explosive pressure acting on the conventional steel-bolt-reinforced test section compared to the RDEA-bolt-reinforced test section. Additionally, the RDEA bolt is a free energy-absorbing anchor with built-in elastic elements and an ungrouted free section near the cavern wall position. Its axial direction coincided exactly with the propagation direction of the arch crown stress wave and can effectively attenuate the energy of the explosive stress wave, thus resulting in a smaller arch crown acceleration than that of the conventional steel-bolt-reinforced test section. The bottom plate acceleration also exhibited the phenomenon of the conventional steel-bolt-reinforced test section having a larger acceleration than the RDEA-bolt-reinforced test section.