Abstract：Considering the large variety of design parameters and wide range of values of long-life asphalt pavement structure, this paper analyzes the influence of the modulus and thickness of each layer on the tensile strain at the bottom of asphalt concrete layer (εt) and the compressive strain at the top of the subgrade (εz) using the KENPAVE software. The significant influencing factors of εt and εz were further studied by the response surface methodology (RSM), and a correlation model was presented. The analysis results show that intermediate layer thickness, base layer thickness, subbase layer thickness exerted significant influence on εt and εz, intermediate layer modulus and base layer modulus exerted moderate influence, and εt and εz were optimized when 16 cm of intermediate layer, 1800 MPa of modulus, 6 cm of base layer thickness, 1200 MPa of modulus, 40 cm of subbase layer thickness were chosen. The test results may provide a reference for future studies of structure optimization of long-life pavement.
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2014, Vol. 32 
