Mechanical Response and Applicable Layer Analysis of High Modulus Asphalt Pavement Structure
In order to explore the reasonable application layer of high modulus asphalt mixture in semi-rigid base asphalt pavement structure,and clarify the variation law of the influence of the introduction of high modulus asphalt layer on the stress of pavement structure,the BISAR3.0 pavement mechanics calculation program is used to comprehensively investigate the stress state of pavement structures at different depths and calculation points based on four main influencing factors:changes in compressive modulus of middle and lower layer materials,differences in lower layer materials,interlayer bonding state,and different working conditions of the roadbed.The results indicate that for semi-rigid base asphalt pavement,the introduction of a high modulus asphalt layer will not have a significant impact on the stress-strain state of the base layer.Setting high modulus asphalt concrete in the lower layer has a better effect than that in the middle layer.The increase in the modulus of the lower layer helps to reduce the tensile strain at the bottom of the asphalt layer,with a reduction of about 40％.At the same time,the shear deformation and fatigue damage resistance of the asphalt surface layer at differ-ent depths of the pavement are also improved.Improving the interlayer contact strength between the high modulus asphalt layer and the semi-rigid base layer can significantly improve the overall stress performance of the pavement structure,effectively reducing the tensile and shear strains of each struc-tural layer.Improving the compressive modulus of the roadbed can effectively improve the stress state of the base layer,and reduce the risk of semi-rigid base cracking and the resulting problem of reflec-tive cracks in the asphalt surface layer.
high modulus asphalt pavementsemi-rigid baseapplicable layerstress-strain analysisBISAR3.0
万方数据
维普
