Analysis of Design Index and Mechanical of Asphalt Pavement Structure in the Northwest Desert Areas

Abstract

In this paper, pavement performance index PCI, road surface deflection and pavement rutting are proposed as the design indexes of pavement structure by analyzing the desert region of bad natural environment under heavy load traffic asphalt pavement condition and using finite element analysis. The stress distribution of durable asphalt pavement structure in desert area was obtained. The results showed that it is an approximate linear relationship between maximum vertical deformation of road surface and wheel load under different wheel load. With the increase of axial load, the maximum vertical deformation increases gradually. The maximum tensile stress of the road surface is symmetrical distribution with the wheel axis. The shear stress in the pavement structure increases with the increase of depth, and the shear stress reaches the peak value in the distance from the road surface 5cm. The results of the research can be a scientific theoretical support and a technical guidance for the selection and structural design of the asphalt pavement in the desert region.