The study on soils external friction

Abstract

The molecular-mechanical (adhesion-deformation) theory of friction with respect to a dispersed medium was confirmed in the article on the basis of theoretical and experimental soils external friction studies. At the same time, the soil particles interaction calculated model of a spherical shape with a smooth polymer surface was developed and an expression for determining the area of their actual contact with a solid surface under the action of a load N was obtained. The calculated contact area results‘ comparison for coarse and fine sand showed satisfactory convergence with the experimental data (discrepancy does not exceed 8-10%). The particles behavior analysis of the dispersed medium adjacent to a solid smooth surface under shear, presented in the computational model, was confirmed by the experimentally obtained and fixed plastic deformations of the polymer surface layer. The experimental studies using a soil tribomer allowed to determine the deformation proportion and adhesive components in the external friction force of sandy and clay soils. Using the obtained dependencies for calculating and contacting soil particles with a solid surface, a method for calculating the coefficient of external friction of the soil based on the molecular-mechanical theory of friction is proposed.