Improvement of Mohr-Coulomb criterion for designing pavements of roads of low traffic intensity

Introduction. Currently, when designing road pavements taking into account soil shear displacement, shear stresses from temporary and permanent loads are calculated at different values of internal friction angle. Consequently, in terms of soil shear displacement while designing road pavements, stresses applied along two different sites are considered, which is an error and requires correction. Materials and methods. A model for predicting accumulated residual deformation has been developed, which allows for determining the value of the maximum principal stress at which the residual deformation reaches its limit value, given that values of the minimum principal stress and the number of applied loads are known. The values of principal stresses being taken into account, the adhesion and the angle of internal friction are calculated for the number of loads considered in the deformation calculation. Results. The calculation of shear resistance and resistance to universal tension parameters was performed by applying the proposed model and the Barksdale-Kazarnovsky model for calculating the accumulated residual deformation. The calculation results have been compared. Conclusions. The obtained results allow for designing surfaces of roads of low traffic intensity based on the criterion of resistance to soil shear displacement.