Analysis On The Mechanical Responds Of Asphalt Pavement Under Heavy Traffic And Rutting Prediction

During the last 30 years of reform and opening-up, as the economic system gets more and more well established and improved, China's highway construction has been developing rapidly. However, the subsequent overloading problems have become more and more serious at the same time, which can be a great chalange to the lifetime of asphalt pavement and the quality of road service. In view of the current overloading transportation situations, it has become significant to perform quantitative analysis on the mechanical response of asphalt pavement to overloading and formation law of permanent deformation, using mechanical analysis methods.This paper combines the real example of the Zhengzhou and Kaifeng logistics channel construction project to show the research on the asphalt pavement in terms of response characteristics to vehicle load, horizontal force level, temperature level and the formation law of pavement rut from the role of axle, vehicle load, speed, etc. using the finite element software ABAQUS based on 3D finite element basic methods.The resultes of this paper shows that:as the vehicle axle load increases graduately, the road surface deflection and the stress and strain increased significantly compared with those of the standard axle load, therefore with the repeated affection from heavy axle vehicles, the road is more prone to early diseases such as fatigue cracking, compaction and deformation; excessive levels of horizontal force would increase the pavement shear stress significantly, especially with heavy axle vehicles which have a greater level of horizontal force the pushing and shear destruction effects on the pavement can not be ignored; the development of rutting is closedly related with the car axle weight and roles;research shows that the pavement rutting are mainly formed in the early life and the increase of vehicle axle load greatly increased the depth of pavement rutting; research also shows that lower speed of the vehicles can accelerate the occurrence of pavement rutting, especially on the track. Since heavy vehicles are usually at low speed, they generally bring more destruction to the road. Research of this subject has enhanced our understanding of fatigue and shear failure of asphalt pavement, as well as the generation of pavement rutting, which can guide us in the future heavy traffic road design, construction and management operations, to maximize the lifetime of the pavement roads and economize on costs and resources;and it also can be used in the more in-depth study of pavement roads in China.