Dynamic Response of HeavyDuty Asphalt Pavement Affected by Moisture

Abstract:

Taking into consideration the impact of underground water and infiltration, a dynamic analysis model of asphalt pavement under heavy load traffic was established by using ABAQUS. The distribution characteristics of subgrade resilient modulus caused by moisture change resulting from underground water rising and rainfall infiltration was investigated, and the dynamic response of asphalt pavement under heavy load of threeaxis with two wheels was analyzed. It is shown that the subgrade resilient modulus is seriously affected when underground water rises, and the reduction is more significant where the subgrade is affected by rainfall and traffic load. The tensile stain at the bottom of surface course increases from 70×10-6 to 173×10-6 when the distance from underground water to the subgrade top decreases from 6 m to 2 m. Rainfall intensity has a huge effect on the tensile stain at the bottom of the surface course of outside lanes and a smaller effect on that of inside lanes. As rainfall days grow, the tensile stain at the bottom of the surface course of outside lanes declines while that of inside lanes increases which behaves in an opposite way.