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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第3期    总第247期    2015年3月

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文章编号:1672-7207(2015)03-1140-07
低速与变速动载作用下沥青路面动力响应
钱振东1,杨宇明1,陈团结2,李展1

(1. 东南大学 智能运输系统研究中心,江苏 南京,210096;
2. 中交第一公路勘察设计研究院有限公司,陕西 西安,710065
)

摘 要: 为分析低速、变速车辆动载对沥青路面结构的影响,利用室内动态模量实验结合时温等效原理确定几种路面沥青材料的动态模量主曲线;通过调查和计算得到车辆在不同变速条件下的荷载作用方式;建立车辆连续变速条件下路面材料动态模量的变化规律;利用三维有限元模型分析不同车速和速度变化对沥青路面力学响应的影响,比较采用动态模量和抗压回弹模量的计算结果。实验结果表明:动态模量能较好地反映车辆荷载作用下的路面材料力学性能,较低车速更易导致路面结构的疲劳损伤,而车辆加速度的增加使结构面层内剪应力峰值增长较大,易导致车辙、拥包等剪切破坏。

 

关键字: 道路工程;路面;道路交叉口;移动荷载;动态模量

Dynamic response of asphalt pavement under moving loads with low and variable speed
QIAN Zhendong1, YANG Yuming1, CHEN Tuanjie2, LI Zhan1

1. Intelligent Transportation System Research Center, Southeast University, Nanjing 210096, China;
2. CCCC First Highway Consultants Co., Ltd, Xi’an 710065, China

Abstract:In order to study the influence of vehicle loads with low and variable speed on asphalt pavement, the dynamic modulus master curves of several asphalt mixtures were determined according to the laboratory test data and time-temperature superposition principle. The moving load model was established by investigation and calculation. The change law of pavement materials’ dynamic modulus under vehicles’ variable motion was established. The influences of different vehicle speed and speed variation on the dynamic response were analyzed using 3D finite element method. The contrasts of numerical computation result between using dynamic modulus and compressive resilient modulus were also studied. The results show that dynamic modulus reflects mixture properties more accurately under moving loads, and the lower vehicle speed can cause fatigue damage more easily. The maximal horizontal shear stress increases greatly with the increase of vehicle acceleration, which makes swell and rut occur frequently.

 

Key words: road engineering; road pavement; road intersection; moving loads; dynamic modulus

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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