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为解决沥青路面模量参数反演时有效动态理论弯沉盆数据获取问题,采用动力有限元数值分析方法,探讨了结构层材料阻尼参数的计算求解方法,建立了路基阻尼参数的预估分析模型,考察了测试荷载的动力效应以及层间非连续接触行为对路表动态弯沉盆的影响规律。研究结果表明:路基阻尼参数是影响路表动态弯沉分布的重要因素,并受路基模量的影响最为显著,而其他路面结构层参数对其影响可以忽略不计;FWD动静荷载作用下沥青路面路表弯沉盆的分布规律明显不同,相同的路面结构层间接触状态不同,路表弯沉盆的分布规律也存在着明显的差异;有效的结构层模量参数反演分析应充分考虑FWD测试设备的动力特性,以及路面层间实际接触条件。
In order to solve the problem of effective dynamic theory of the deflection basin data in the inversion of asphalt pavement modulus parameters, the calculation method of the damping parameters of the structural layer material was discussed by dynamic finite element method. The prediction model of the damping parameter of the subgrade was established The dynamic effects of test load and the influence of non-continuous contact behavior on dynamic deflection basin of road surface were investigated. The results show that the damping parameters of subgrade are the important factors that influence the dynamic deflection distribution of road surface and are affected by the subgrade modulus, while the influence of other pavement structure parameters can be neglected. The influence of FWD dynamic and static load on asphalt pavement The distribution law of the deflected basin is obviously different. The contact state of the same pavement structure is different, and the distribution law of the deflected basin is also obviously different. The effective structural layer modulus parameter inversion analysis should fully consider the FWD test The dynamic characteristics of the equipment, as well as the actual contact conditions between pavement layers.