Effect of asphalt layer modulus on the mechanical properties of heavy load asphalt pavement

Asphalt layer modulus is an important mechanical parameter of pavement material and it is one of the fundamental bases in pavement design.It directly influences the design result and the mechanical properties of asphalt pavement structure.By choosing FEM method,the effects of asphalt layer modulus on surface deflection,tensile stress at the bottom of base and sub-base course,stress at the the bottom of asphalt layer of heavy load semi-rigid asphalt pavement structure were analyzed systematically.And the influencing laws were analyzed,too.The results indicate that the mechanical properties and deforming characteristics of heavy load asphalt pavement were influnced significantly by asphalt layer modulus.With the increasing of asphalt layer modulus,the surface deflection,tensile stress at the bottom of base and sub-base course would significantly decrease,and the life of heavy load semi-rigid asphalt pavement structure would prolonged.