ABSTRACT
ABSTRACT: Subgrade yields plastic deformation under dynamic traffic loads cyclic in nature. The plastic deformation increases with the load repetitions and it may lead to failure. In this paper, the distributions dynamic stresses and strains in the pavement and subgrade t were analyzed through an established vehicle-pavement-coupling model. By using strength properties and introducing dynamic failure criteria, a restricted vertical strain of subgrade was established as a failure criterion on the basis of subgrade-pavement failure mechanism emphasizing rutting resistance. The corresponding dynamic stress was considered for establishing strength failure criteria. The design method based on the theory of applied dynamic stress in relation to strength was applied to a pavement having full weathering granite subgrade. The feasibility and application scope of the full weathering granite in highway subgrade was assessed using the design norm.
