ABSTRACT
In this paper, low volume road pavement has been considered as pavement with only unbound granular base and sub base layer resting on subgrade soil. Design of pavement has been done with stress based design approach. The allowable stress on top of the subgrade to limit rutting has been considered from mechanistic-empirical design approach. Present paper deals with dispersion of stress at interface from a stiffer to softer layer in a flexible pavement so that the thickness of pavement may reduce the vertical stress on subgrade to its allowable level. A factor defined as Concentration factor has been used in this paper to find out vertical stress reduction at interface of granular base and subgrade using Boussinesq’s approach. Concentration factor for different modulus ratio have been determined analytically and expressed as a function of modulus ratio, i.e the ratio of elastic modulus of stiffer and softer layer in a two layered system.
