# Soil Spectral Behavior Related to Its Load-Bearing Capacity Based on Moisture Content
## 5 Conclusions  
One promising approach involves using alternative soil properties, such as color, to infer moisture content and thereby avoid the unwanted sinkage of vehicles into the terrain. The findings in this article are highly relevant to the fields of geotechnical engineering, soil science, and civil engineering. By accounting for the impact of moisture content on soil behavior, we can develop more accurate and effective models for predicting the performance of off-road vehicles in different environmental conditions. The moisture content in the soil influences its bearing capacity, thus influencing its vertical deformation resulting from an excitation load. At the same moisture content, an increase in the applied pressure leads to an increase in the sinkage of the soil. With the same consolidation load applied to the soil and an increase in the moisture content, the sinkage increases. Furthermore, the influence of the moisture content on the soil is clear in Figures 4, 6 and 7; thus, with the increase in the moisture, the load-bearing capacity of the soil decreases. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Sample No.** & **MC (\%)** & \(Rm^{*}\)**(4/5)** & \(Rm^{*}\)**(4/7)** & **X (10\({}^{\circ}\)/D65)** & **Y (10\({}^{\circ}\)/D65)** & **Z (10\({}^{\circ}\)/D65)** & **Ref. at 700 nm** \\ \hline
1 & 1.05 & 8.13 & 11.58 & 11.56 & 11.71 & 8.84 & 16.25 \\
2 & 3.34 & 6.66 & 9.69 & 9.68 & 9.77 & 7.23 & 13.92 \\
3 & 4.82 & 5.09 & 7.44 & 7.40 & 7.41 & 5.52 & 10.92 \\
4 & 6.05 & 4.31 & 6.01 & 5.94 & 5.95 & 4.66 & 8.67 \\
5 & 7.63 & 4.37 & 5.83 & 5.74 & 5.79 & 4.72 & 8.04 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: This table shows some important spectral reflectance parameters. Figure 8: Spectral reflectance parameter–moisture content relationship. Additionally, the soil's color (spectral behavior) is a property that can be used to identify the soil's load-bearing capacity (based on laboratory experiments). By relating the load-bearing capacity of the soil to its color (spectral reflectance) through the soil moisture content, the color of the soil will be linked to its load-bearing capacity. Spectrophotometric technology is a precise color measurement method that converts the color of the object into a quantitative value. The color results obtained from the measurements show that with the increase in the moisture content, the wavelength reflectance decreases until it reaches a level where the reflectance overlaps in the range below 550 nm. To overcome the overlapping of the results (color measurement) and for using results that are separated at a spectrum (points are not close to each other), it is suggested to use the reflected wavelength at the 700 nm spectrum. Knowing the load applied from the tractive element on the soil, in addition to having the pressure-sinkage curves of the soil at different moisture contents, the resulting sinkage of the tractive element can be deduced from a curve at a moisture value. The moisture value will be predicted from the color measured using the spectrophotometer; thus, the response of the terrain (regarding the sinkage) is identified from the soil color and pressure-sinkage curves (from laboratory work). Finally, using the results of the soil color and its load-bearing capacity at different moisture contents, the load-bearing capacity and the color (reflectance at 700 nm) can be linked at a moisture value. This idea is beneficial in off-road engineering projects for studying the performance of vehicles on soil terrains, especially in autonomous vehicles. The proposed method could help us predict the load-bearing capacity of the soil, serving in choosing the best design (design of the tractive element; dimensions of the wheel and the track) needed to operate on a specific soil terrain. The results presented in this article provide a foundation for future research in this area, with significant implications for a range of practical applications. Writing--original draft A.E.E.A. ; Writing--review & editing: A.E.H. ; Supervision: P.K.