No abstract

In this research, the interest will be given to studying the load bearing capacity and strength of soil terrain, resulting from machine-soil interaction. A small introduction will define terramechanics studies and its importance when dealing with machine-terrain interaction. The axial load acting on a terrain will lead to the sinkage of the machine, thus considering this load will help in studying the load bearing capacity of the soil and ending up with results that are beneficial to terramechnaics studies, so improvement in the machine design or choosing the suitable machine for specific terrain. This review shows the studies and models that researchers obtained and dealt with regarding the load bearing capacity. The techniques and the measurements used in finding the load bearing capacity of soil will be explained (Bevameter, Cone penetrometer).

The shear strength parameters—the shear cohesion and the internal friction angle—are important parameters in calculating the shear strength of the soil, which is a mechanical property reflecting the resistance of the soil to shearing. This article embeds shear cohesion and internal friction angle results of the sandy loam soil measured using the direct shear test relying on drawing the Mohr–Coulomb line. Beside the shear strength parameters, this article contains colour results of the tested soil at different moisture contents, measured using the spectrophotometric technology in the visible band (spectrum; 400–700 nm). Measuring the soil colour might be the simplest way in the field for identifying the shear strength and its parameters in case of having the colour linked to the shear strength parameters through the moisture content of the soil, and this target is achieved by laboratory empirical work. The process of correlating the soil colour and the shear strength parameters at different moisture contents is presented in this article. The measurements were carried out at the Hungarian University of Agriculture and Life Sciences (MATE—Department of Vehicle Technology Laboratory).

No abstract

Soil’s load-bearing capacity is a crucial property from which the ability of soil to resist the vertical deformation resulting from a normal load can be determined, and this property is essential for analyzing a vehicle’s performance over soil terrain in terramechanics studies. Soil’s moisture content has a significant impact on its load-bearing capacity and spectral behavior. This study aims to show the relation between the load-bearing capacity and the spectral behavior of sandy loam soil. The study presents the load-bearing capacity and color results of sandy loam soil at different moisture contents. The load-bearing capacity was measured using the Bevameter technique, and the color was measured using spectrophotometer technology that sends waves in the visible range (400–700 nm). The pressure–sinkage results of the tested soil show that with an increase in the moisture content, the bearing capacity of the soil decreases, and the color results show a decrease in the color reflectance with the increase in the moisture content. The measurements were performed in the laboratory of the vehicle technology department at Hungarian University of Agriculture and Life Sciences (MATE).