Research on the relationship between curvature radius of deflection basin and stress state on bottom of semi-rigid type base

In China´current specification for the design of asphalt pavement, tensile stress of asphalt layer bottom is one of design indexes. However, the design index can not be detected and verified in practical engineering application. Research and analysis of deflection bowl in this paper show that there is a relationship between tensile stress of each layer bottom and deflections in different positions. The dynamic analysis model of rigid pavement under falling weight deflectometer load was established by utilizing ANSYS for researching the relationship between tensile stress of semi-rigid layer bottom and the curvature radius of deflection basin. This paper tries to seek a testing method to characterize pavement design indexes. It would be helpful to establish a relationship between theoretical calculation and the actual test of engineering. It also contribute to evaluate the performance of pavement and riding quality.