Study Of The Application Of Asphalt Pavement With Flexible Base

The main failure mode of asphalt pavement with flexible base is not structural damage but functional destruction in a special range, just needed preventive maintenance and overlaying in the surface over the useful life. This will greatly solve the premature fracture damage of traditional asphalt pavement with semi-rigid base, especially the poor durability and short service life problems, avoid big structural reconstruction. And flexible base materials could be fully utilized in the future repairmen, which not only can greatly reduce maintenance costs and save energy, but also can reduce environmental pollution, reflecting great economic benefits and social benefits.This paper first analyzes the characteristics, domestic and foreign present application of the asphalt pavement structure with flexible base, and its application for permanent pavement structure. Point out that asphalt pavement structure with flexible base has good mechanical properties, has been widely used in abroad, and also been used in several domestic provinces recently. Deserve further study.Then, using ANSYS finite element program analyze the mechanical response of asphalt pavement structure with flexible base, semi-rigid base and combined base. Analyze the displacement deformation, plane stress distribution, shear stress distribution and vertical strain distribution of these three asphalt pavement structures under the standard axle load.Through the analysis of the major damage types and design index at home and abroad of the asphalt pavement, and the calculation and analysis of the deflection value, horizontal stress, strain and shear stress and compressive strain on the embankment top under the heavy-duty traffic, build the design index of asphalt pavement structure with flexible base.Finally, according to the suggestion design index of asphalt pavement structure with flexible base, through study the reasonable thickness of road surface and flexible base, effect of mechanical response of pavement structure by the modulus of flexible base and by the modulus of subgrade. Study the appropriate structure of asphalt pavement with flexible base.Play a certain boost for popularization and application of asphalt pavement structure with flexible base in our country.