## 4 Test Results and Discussion  
### Weathering Process  
Figures 13 and 14, respectively, show changes of parameters \(m\) and \(r\) for the samples at different depths of mountain profile, \(h\).  
Figure 12: Weathered granite subgrade test section.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Type of Parameter** & **Name of Parameter** & **Value of Parameter** \\ \hline \multirow{4}{*}{Quality/Pressure parameter} & Working quality of whole machine, kg & 20,000 \\  & Distributed quality of vibration wheel, kg & 10,000 \\  & Distributed quality of drive axle, kg & 10,000 \\  & Net line pressure of vibratory wheel, kg/cm & 470 \\ \hline \multirow{4}{*}{Size parameter} & Diameter of vibration wheel, mm & 1600 \\  & Width of vibration wheel, mm & 2130 \\  & Rim thickness of vibration wheel, mm & 40 \\ \hline \multirow{4}{*}{Working parameter} & Vibration frequency, Hz & 29 \\  & Vibration amplitude, mm & 1.9 \\ \cline{1-1}  & Excitation force, kN & 368 \\ \cline{1-1}  & Rolling speed, km/h & 5 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Parameters of vibratory roller.  
The results of statistical analysis indicate an approximately power function relationship between \(h\) and \(m\) (or \(r\)), and the correlation of relationship was relatively good. The power function relationships in section A are showed as follows:  
\[m_{\rm A}=3.324h^{-0.706}, \tag{13}\]  
\[r_{\rm A}=0.243h^{0.153}, \tag{14}\]  
where \(h\) is the depth of granite samples, which was measured from the surface of mount; \(m_{\rm A}\) and \(r_{\rm A}\) is geological year's parameter and geometric progression constant in section A, respectively.  
The power function relationships in section B are showed as follows:  
\[m_{\rm B}=3.729h^{-0.747}, \tag{15}\]  
\[r_{\rm B}=0.269h^{0.168}, \tag{16}\]  
where \(m_{\rm B}\) and \(r_{\rm B}\) is geological year's parameter and geometric progression constant in section B, respectively.  
In fact, the geological year's parameter, \(m\), represents the degree of geological actions (including physical actions and chemical actions). The deeper the granite is buried, the less the geological action will affect it. The above experimental results show that the geological year's parameter, \(m\), was close to zero at a depth of 20-25 m under the surface of the mount, indicating that the geological action on the granite was negligible at this depth. The geometric progression constant, \(r\), actually reflects the  
Figure 14: Change of parameters \(r\) for samples at different depths: (**a**) Section A; (**b**) section B.  
Figure 13: Change of parameters \(m\) for samples at different depths: (**a**) Section A; (**b**) section B.  
integrality of rock. For the mountains studied in this paper, the geometric progression constant of section A and section B was close to a certain value at a depth of 25 m and 20 m, respectively, indicating that the granite in the mountains studied in this paper was close to the complete unaltered state at a depth of 20-25 m.  
The test results show that the \(m\) of section A was larger than that of section B at the same depth, which illustrates that the ability of section A to resist geological and climatic environment was worse than that of section B. By contrast, the \(r\) of section A was smaller than that of section B at the same depth, which indicates that the integrality of granite in section A was worse than that in section B. Under the same geological and climatic environment, the main reason for the difference in \(m\) and \(r\) between section A and section B was the difference in internal properties (such as the mineral composition of rocks) between these two sections. In other words, it may be due to the fact that the content of weathering resistant minerals (such as quartz) in Section A are smaller than those in Section B. Of course, some external factors could not be excluded, for example, the probability of fracture distribution of section A is larger than that of Section B.