Research On Design Of Flexible Base Asphalt Pavement

Along with the development of our country's traffic,the demands of load and environment on the pavement structure are being higher and higher. In order to solve the early damage problems of traditional semi-rigid structure, the article based on analysis of existing research results at home and abroad,aimed at the characteristics of the flexible base pavement structure,searched after reasonably asphale pavement forms, and adopt ansys finite element model for calculation and analysis. Through using different surface layer thickness, surface elastic modulus, flexible base thickness, flexible base modulus and different soil-modulus etc parameters, analys the relation between the road pavement structure deflection, stress analysis and structure of layer thickness and modulus of flexible base,so draw a conclusion.In addition, this paper also adopt stress absorption layer of the structure, stress absorption layer is a relatively new design in recent years, it can dramatically reduce the stress of the structure layers,improve the entire stress state of the asphalt structure, reduce the degree of stress concentration at the end of structure, extended pavement life. The apply of stress absorption layer provided certain practical basis for future application development.Through analysis of the flexible base pavement structure, compare between flexible and semi-rigid pavement from aspects of the force of circumstances and economic.Demonstrate the superiority of flexible base pavement structure to semi-rigid base pavement,thereby determine the feasibility of flexible base pavement and provide the basis for long-term development.