Characterization of soil parameters of two soils of Rio Grande do Sul in modeling the prediction of tractive effort

Abstract

ABSTRACT:The interaction between the soil and tillage tool can be examined using different parameters for the soil and the tool. Among the soil parameters are the shear stress, cohesion, internal friction angle of the soil and the pre-compression stress. The tool parameters are mainly the tool geometry and depth of operation. Regarding to the soils of Rio Grande do Sul there are hardly any studies and evaluations of the parameters that have importance in the use of mathematical models to predict tensile loads. The objective was to obtain parameters related to the soils of Rio Grande do Sul, which are used in soil-tool analysis, more specifically on mathematical models that allow the calculation of tractive effort for symmetric and narrow tools. Two of the main soils of Rio Grande do Sul, an Albaqualf and a Paleudult were studied. Equations that relate the cohesion, internal friction angle of the soil, adhesion, soil-tool friction angle and pre-compression stress as a function of water content in the soil were obtained, leading to important information for use of mathematical models for tractive effort calculation. KEYWORDS:Soil cohesion, soil-tool adhesion, pre-compression stress. CARACTERIZAÇÃO DOS PARÂMETROS DE SOLOS DO RIO GRANDE DO

Excel Add-in to Model the Soil Compression Curve

“…Soil compression curve (CC) has been used to study soil load-bearing capacity (KELLER et al, 2011;SEVERIANO et al, 2010;MACHADO & TREIN, 2013). Originally, soil CC was described as the graphical relation between the base 10 logarithm of the applied load (log10 σ) and the void ratio (ε) (CASAGRANDE, 1936).…”