移动荷载下沥青路面内应力脉冲的持续时间  

Stress pulse durations in asphalt pavement under moving load

作　　者：赵延庆[1] 王志超[1] 王国忠[1] 谭忆秋[2] 

机构地区：[1]大连理工大学交通运输学院,辽宁大连116024 [2]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150001

出　　处：《交通运输工程学报》2009年第6期11-15,共5页Journal of Traffic and Transportation Engineering

基　　金：国家西部交通建设科技项目(200431800004);国家自然科学基金项目(50778057)

摘　　要：利用粘弹性三维有限元模型与随时间和空间变化的荷载模式模拟移动荷载,分析了不同温度与不同行车速度下沥青路面内不同深度处的应力脉冲时间,与Odemark方法计算结果进行了比较,并根据2种方法得到的应力脉冲时间预测了沥青混合料的动态模量。研究结果表明:应力脉冲时间和深度之间存在明显的非线性关系,在靠近路表处,温度和速度对应力脉冲时间的影响较小,而在较深处,则影响显著,且预测的动态模量最大相对误差为16.1%,利用粘弹性有限元方法避免了Odemark法中由相关的经验公式及假设所产生的误差,能更好地反映实际情况。The stress pulse durations of various depths in asphalt pavement at different temperatures and vehicle speeds were evaluated by using viscoelastic 3D finite element method （FEM） and simulating the traffic with moving loads which vary with time and space. The results were compared with those obtained by using Odemark method. The durations obtained from both FEM and Odemark method were used to predict the dynamic moduli of asphalt mixtures. The result shows that there clearly exists a nonlinear relationship between the stress pulse duration and the depth. The effect of temperature and speed on the duration is small on pavement surface, while it becomes significant at deeper locations. The maximal relative error of the predicted dynamic moduli is 16.1%. The study indicates that viscoelastic FEM can avoid the errors resulted from the empirical relationships and assumptions adopted in Odemark method, and thus can better represents the real behavior of asphalt pavement. 1 tab, 8 figs, 10 refs.

关 键 词：路面工程 应力脉冲时间 粘弹性 三维有限元 Odemark方法 动态模量 

分 类 号：U416.218[交通运输工程—道路与铁道工程]