高模量沥青路面结构力学响应及适用层位分析  

Mechanical Response and Applicable Layer Analysis of High Modulus Asphalt Pavement Structure

作　　者：牛倩 栾扬 孟会林 NIU Qian;LUAN Yang;MENG Huilin(Shijiazhuang Jiaojian Expressway Construction Management Co.,Ltd.,Shijiazhuang 050000,China;Hebei Provincial Communications Planning,Design and Research Institute Co.,Ltd.,Shijiazhuang 050091,China)

机构地区：[1]石家庄市交建高速公路建设管理有限公司石衡分公司,石家庄050000 [2]河北省交通规划设计研究院有限公司,石家庄050091

出　　处：《交通科技》2024年第5期13-18,共6页Transportation Science & Technology

摘　　要：为探究高模量沥青混合料在半刚性基层沥青路面结构中的合理应用层位,明确高模量沥青层的引入对路面结构受力影响的变化规律,文中选用BISAR3.0路面力学计算程序,以中下面层材料抗压模量变化、下面层材料差异、层间黏结状态、路基不同工况四类别主要影响因素开展不同深度与计算点位的路面结构受力状态的全面考察。结果表明,对于半刚性基层沥青路面,高模量沥青层的引入不会对基层的应力、应变状态产生较大影响,将高模量沥青混凝土设置在下面层的效果优于中面层,下面层模量的提高有助于减小沥青层层底的拉应变,降低幅度在40%左右,同时路面沥青面层不同深度的抗剪切变形和抗疲劳损伤能力也均有所提升;提高高模量沥青层与半刚性基层的层间接触强度可显著改善路面结构的整体受力性能,有效降低各结构层的拉应变与剪切应变;提高路基抗压模量可有效改善基层受力状态,降低半刚性基层开裂风险及由此产生的沥青面层反射裂缝问题。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 different 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 structural 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 reflective cracks in the asphalt surface layer.

关 键 词：高模量沥青路面 半刚性基层 适用层位 应力应变分析 BISAR3.0 

分 类 号：U416.2[交通运输工程—道路与铁道工程] U416.01