## 4 Results
### 4.3. Geomechanical Study
#### 4.3.2 Geomechanical Characteristics of Soil and Rock Stations  
The results of the geomechanical characterisation of rock stations are shown in Table 10. The study in the geomechanical soil stations revealed a moderate to residual weathered soil degree. Additionally, these stations are characterized by no water to minimal surface water, and from little vegetation to being largely covered by adequate vegetation. In the case of the characterised soils, it was found that the predominant soil is represented by clayey colluvial soil, with weathered sandstone blocks of medium grain (Table 12).  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Station** & \begin{tabular}{c} **Soil Description** \\ **(Characteristic)** \\ \end{tabular} & \begin{tabular}{c} **Geological** \\ **Structure** \\ \end{tabular} & **Water Presence** & **Vegetable Cover** & \begin{tabular}{c} **Weathering** \\ **Degree** \\ \end{tabular} \\ \hline GS01 & \begin{tabular}{c} Residual soil formed by \\ shale weathering \\ \end{tabular} & \begin{tabular}{c} Weakness planes \\ favour sliding \\ \end{tabular} & No water presence & \begin{tabular}{c} Little vegetation \\ cover \\ \end{tabular} & Residual soil \\ \hline GS03 & \begin{tabular}{c} Predominantly \\ sandy-wet soil, \\ significant clayey \\ fraction \\ \end{tabular} & \
\begin{tabular}{c} Slope position \\ somewhat \\ favourable \\ concerning \\ weakening planes \\ \end{tabular} & Minimal surface & No vegetation &
\begin{tabular}{c} Moderately \\ covered \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table}
Table 11: Physical–mechanical properties of rock samples from geomechanical stations.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Station** & \begin{tabular}{c} **Rock Type and** \\ **Characteristics** \\ \end{tabular} & \begin{tabular}{c} **Density** \\ **(g/cm\({}^{3}\))** \\ \end{tabular} & \begin{tabular}{c} **Compressive** \\ **Strength (kg/cm\({}^{2}\))** \\ \end{tabular} & \begin{tabular}{c} **Cohesion** \\ **(kg/cm\({}^{2}\))** \\ \end{tabular} & \begin{tabular}{c} **Friction Angle** \\ **(Degrees)** \\ \end{tabular} \\ \hline GS02 & \begin{tabular}{c} Medium-grained sandstone \\ \end{tabular} & 2.40 & 575 & 130 & 34–40 \\ \hline GS04 & \begin{tabular}{c} Siliceous shale \\ \end{tabular} & 2.35 & 320 & 105 & 39–43 \\ \hline GS08 & \begin{tabular}{c} Medium-grained sandstone \\ \end{tabular} & 2.50 & 605 & 140 & 40–43 \\ \hline GS10 & \begin{tabular}{c} Fine-grained sandstone \\ \end{tabular} & 2.38 & 410 & 110 & 34–38 \\ \hline GS13 & \begin{tabular}{c} Medium-grained sandstone \\ \end{tabular} & 2.54 & 685 & 150 & 36–43 \\ \hline GS14 & \begin{tabular}{c} Sandstone with \\ intercalations of high \\ compressive strength rocks \\ \end{tabular} & 2.62 & 655 & 125 & 37–42 \\ \hline GS15 & \
\begin{tabular}{c} Medium-grained sandstone \\ \end{tabular} & 2.40 & 475 & 120 & 32–38 \\ \hline GS16 &
\begin{tabular}{c} Sandstone with \\ intercalations of low \\ compressive strength rocks \\ \end{tabular} & 2.35 & 270 & 115 & 37–41 \\ \hline \hline \end{tabular}
\end{table}
Table 12: Description of geomechanical soil stations.  
Figure 7: Correlations between the VESs (4-3) and drilling D1. It can be seen that the material obtained from drilling D1 (shales) coincides with the resistivity presented (values between 35.0 and 40.0).  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
\begin{tabular}{c} 600 mm spacing, aperture \\ between 0.7 and 1.0 mm \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table}
Table 13: Geomechanical characteristics of the rock stations.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline