Abstract
AbstractCurrently, when calculating road pavements, a criterion is used that limits the depth of the ruts formed on the asphalt concrete pavement. The actual depth of the rut is calculated according to well-known analytical solutions and mechanical-empirical formulas, assuming that the rut is formed due to wear of the pavement, as well as the accumulation of residual deformations in the structural layers of the pavement and the subgrade soil. The actual rut depth is compared with the limit value, which is assigned according to the recommendations of the road agencies. Analysis of the limit values of the rut depth recommended by different authors and used in the practice of various road agencies showed that these values differ by a factor of 1.5–2.5. The article presents a method for calculating the limit depth of the rut, which allows limiting its values depending on the required values of the coefficient of adhesion of the tire with the coating, the speed of movement along the road section, the depth of the water layer in the rut and the roughness parameters of the coating. The calculation of the limit depth of the rut is based on the criterion according to which the actual value of the coefficient of adhesion of the tire with the coating cannot exceed the limit value. To calculate the coefficient of adhesion of a tire with a coating, a mathematical model was obtained describing experimental data on the dependence of the coefficient of adhesion of a tire with a coating from the depth of the water layer, the parameters of the roughness of the coating, and the speed of movement. From this dependence, at the required (limit) value of the coefficient of adhesion, speed of movement, roughness parameters, a dependence is obtained that allows calculating the critical thickness of the water layer and the corresponding limit depth of the rut. The results of calculating the limiting rut depths for various conditions of the pavement are presented.KeywordsRoadRut depthLimit rut depthPavement
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