摘要
为了分析和预估青临高速试验路沥青路面结构疲劳寿命和永久变形,为长期性能观测验证提供基础对比数据,按照标准试验方法对试验路土基、粒料、无机结合料以及沥青混合料的力学参数进行测试分析;结合同类道路交通荷载分析,得出试验路交通组成、轴载谱及3类典型轴的最大特征值;按照弹性层状理论计算了常温和高温条件下沥青层底最大弯拉应变;用MEPDG永久变形预估模型分析了不同路面结构沥青层永久变形发展规律,预测车辙养护修复的时间。结果表明,所设计的沥青路面结构基本满足长寿命沥青路面沥青层底弯拉应变小于疲劳极限应变的要求,MEPDG预测车辙主要发生在表面层,中下面层车辙较小,表面层采用高模量沥青混合料可显著提高路面抗车辙能力。
In order to analyze and predict the fatigue life and permanent deformation of asphalt pavement structure of Qingzhou - Linshu expressway test road and provide fundamental comparative data for long-term performance observation, the mechanical parameters of soil subgrade, granules, inorganic binder and asphalt mixture used in the test road are analyzed according to the standard test method. The traffic composition, the axle load spectrum and the maximum characteristic values of 3 typical axle types are obtained by analyzing the traffic load on similar road. The maximum flexural-tensile stains at the bottom of asphalt mixture layers under normal and high temperature conditions are calculated using the elastic multilayer theory. The MEPDG permanent deformation prediction model is applied to analyze the development of permanent deformation in the asphalt layers of different pavement structures, and their rutting maintenance time is predicted. The result shows that （ 1 ） the designed asphalt pavement structure basically meets the requirement of long-life asphalt pavement that the flexural-tensile strain at asphalt layer bottom is less than the fatigue limit strain, and the rutting predicted by MEPDG occurred mainly in the surface layer, while rarely occurred in middle layer and lower layer; （3） it will significantly improve the rutting resistance property when high modulus asphalt mixtures are applied in the top layer.
出处
《公路交通科技》
CAS
CSCD
北大核心
2015年第8期1-5,24,共6页
Journal of Highway and Transportation Research and Development
基金
山东省交通运输厅科技项目(2009Y02)
关键词
道路工程
路面性能预估
MEPDG
极限应变
永久变形
road engineering
pavement performance prediction
MEPDG
limit strain
permanent deformation
