Research on design indices of perpetual asphalt pavement

In order to investigate the design method of perpetual asphalt pavement, the indices about tensile strain at the bottom of asphalt layer and the compressive strain at the top of subgrade were validated with SHELL design method, AI design method and so on, the strain indices were statistically analyzed according to the structure combination of representative perpetual asphalt pavement in foreign countries, and the design indices were modified based on the pavement design parameters in China, the two foreign design indices of perpetual pavement were approved to be reasonable, the control indices of structure design for perpetual pavement in China were put forward as follows: the tensile strain at the bottom of asphalt layer should be not more than 120×10^-6, and the compressive strain at the top of subgrade should be not more than 280×10^-6, the mechanical analyses of test road structures were carried out. Study result shows that the tensile strains at the bottom of asphalt layers are less than 120×10^-6, and the compressive strains at the top of subgrades are less than 280×10^-6, so the test road sections satisfy the indices of perpetual pavement.