Notice of RetractionCorrection factor of surface deflection for asphalt pavement of granular sub-base based on linear-anisotropy

Abstract

Anisotropy of granular material has been proved by experiment, but the current design specifications are also based on isotropic theory, it is not safe for asphalt pavement structure, there is a greater change for pavement life with the less change of surface deflection. Based on linear-anisotropic model, on the condition of the high, medium and low strength of soil subgrade, 4 different thickness of asphalt layer and 3 different thickness and strength of granular sub-base are been systematically studied, the results show that, the strength of the soil subgrade has bigger effect on the pavement deflection because of the granular anisotropy, the bigger deflection difference of the low to the high subgrade is up to 63.7%, the biggest deflection correction factor is up to 1.05 with the thickness of asphalt layer, the effect is not obvious for the strength, thickness and anisotropy of granular sub-base to the surface deflection, but it has the greater effect on the deflection correction factor, the biggest correction factor is up to 1.055 and 1.1 for the granular strength and thickness, the relation of granular anisotropy to deflection correction factor is inverse, the biggest factor may be up to 1.045.