Structural Response Analysis of Flexible Base Asphalt Pavement Based on Bi-modulus Theory
Most of the mechanical parameters of pavement materials have significant differences in tension and compression,but the current flexible base asphalt pavement design still uses a large pressure modulus as the design parameter,resulting in a large error in structural mechanics calculation and analysis,and the pavement design results are not reliable.Therefore,acom parative analysis of the mechanical response of flexible base asphalt pavement structure based on bi-modulus theory and traditional linear elasticity theory was carried out to reveal the influence of structural parameters on the key mechanical response of flexible base asphalt pavement structure.The results show that the deviation between the calculated results of mechanical response based on the bi-modulus theory and the traditional linear elastic theory is as high as 15％.The thickness of the structure layer has a great influence on the mechanical response of the structure,especially the thickness of the base layer.The mechanical response of each structure decreases with the increase of the thickness of the upper middle surface layer and increases with the increase of the thickness of the lower layer,which is a quadratic function relationship,and the maximum variation range is about 20％.The road surface deflection,the longitudinal tensile stress,and the tensile strain of the base layer decrease with the increase of base layer thickness,and the transverse tensile strain of the road surface increases with the increase of base layer thickness,in which the transverse tensile strain of road surface is most significantly affected by the change of more than 40％.The research results can provide a reference for the structural design of flexible base asphalt pavement based on the bi-modulus theory.
asphalt pavementbi-modulusflexible base layermechanical analysisnumerical calculation
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