交通荷载下沥青路面结构动力响应理论研究

采用移动荷载下黏弹性层状体系动力学模型,分析加厚式半刚性基层结构、改进型半刚性基层结构、倒装式路面结构和全厚式路面结构等4种典型沥青路面结构在标准荷载工况和超载100%工况下的动力响应,研究各种路面结构之间差异.结果发现,面层底部水平剪应变对路面结构使用寿命影响最为严重.

Theoretical Research of the Dynamic Response of Asphalt Pavement Structure Under Traffic Loads

This paper establishes the dynamics model of visco-elastic layer system under moving load.The dynamic responses of four kinds of typical asphalt pavement structure,namely,the thick semi-rigid,the improved semi-rigid,the inverted pavement and the full depth pavement structure,are analysed under the standard load and the 100% overloading condition to study the various differences between the pavement structures.Results show that the life of pavement structure is more seriously affected by the surface bottom shear strain.The shear strain of the semi-rigid pavement structure at the bottom of surface layer is high,which may easily lead to premature failure.The cost of the full depth pavement structure is expensive.The various dynamic response indicators of the inverted pavement structure is lower,especially when this structure uses flexible base and semirigid structure.This structure can not only make drainage easy,but get rich experience of construction,so it is a more suitable pavement structure of heavy-load traffic highway.