黄立葵 宋伟 姜正晖 杨树

摘   要：为分析半刚性基层沥青路面中沥青层模量在时间域和空间域上的分布特征，研究模量场年变化对结构层疲劳寿命的影响，将沥青面层细分为1 cm厚的亚层，基于Odemark法经迭代计算得到了沥青层中的模量场分布，分析全年456种工况下路面结构的力学响应，基于Miner线性疲劳损伤模型计算得到了考虑模量场影响的疲劳寿命修正系数. 结果表明：模量场随时间显著变化，车速为70 km/h时，沥青层各深度处的模量年最大与最小值之比达20.1～34.9，且同一时间沿路面深度方向的模量不相等;车速对模量场有显著影响，车速120 km/h与10 km/h时，沥青层模量之比达1.12～2.28;路面结构的疲劳寿命分析中，应考虑模量场年变化的影响，在20 ℃、10 Hz标准工况下分析得到的上基层疲劳寿命偏保守，下基层疲劳寿命偏危险，建议采用考虑模量场影响的疲劳寿命修正系数调整标准工况下计算得到的结构层疲劳寿命.

关键词：道路工程;沥青路面;模量场;疲劳寿命;修正系数

中图分类号：U416                             文獻标志码：A

Abstract：In order to analyze the distribution characteristics of the modulus field of semi-rigid asphalt pavement in the time domain and spatial domain and to study the effect of the annual change of the modulus field on the fatigue life of the structural layers， the asphalt layers were subdivided into several sub-layers with a thickness of 1 cm. The modulus field distribution in the asphalt layers was obtained by iterative calculations based on the Odemark method， and the fatigue life correction factors of structural layers were obtained based on the Miner linear fatigue damage model as well as the mechanical responses of the pavement structure under 456 conditions throughout the year. The results show that the modulus field varies significantly with time. At the speed of 70 km/h， the ratio of the annual maximum and minimum values of the modulus at each depth of the asphalt layer reaches 20.1～34.9， and the modulus with the pavement depths are not equal at the same time. The ratio of the modulus at the speed of 120km/h to that at 10 km/h is in the range of 1.12 ～ 2.28， which means that the vehicle speed has a significant effect on the modulus field. The influence of the annual change of the modulus field on the fatigue life of pavement structures should be considered. The fatigue life of the upper base calculated under the standard conditions at 20 ℃ and 10 Hz is conservative， while the fatigue life of the lower base is dangerous. The calculation results under the standard condition should be revised by the fatigue life correction factor when checking the fatigue life of the pavement structures.

Key words：road engineering;asphalt pavement;modulus field;fatigue life;correction factor

为获得交通荷载作用下路面结构的真实力学响应，必须合理地选用路面材料的计算参数. 作为一种典型的黏弹性材料，沥青混合料的模量显著依赖于温度和荷载作用频率. 受外界环境的影响，路面结构内部的温度场变化显著，而路面温度场变化必将导致沥青材料层沿路面深度方向的模量分布随之变化. 此外，不同的行车速度对应不同的荷载作用时间，即使在相同……