移动荷载下沥青路面内应力脉冲的持续时间

赵延庆; 王志超; 王国忠; 谭忆秋

doi:10.19818/j.cnki.1671-1637.2009.06.003

移动荷载下沥青路面内应力脉冲的持续时间

doi: 10.19818/j.cnki.1671-1637.2009.06.003

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

基金项目:

国家西部交通建设科技项目 200431800004

国家自然科学基金项目 50778057

详细信息

作者简介:
赵延庆(1972-), 男, 河南孟津人, 大连理工大学副教授, 工学博士, 从事路面材料与结构研究

中图分类号: U416.218
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出版历程
- 收稿日期: 2009-06-25
- 刊出日期: 2009-12-25

Stress pulse durations in asphalt pavement under moving load

1.
School of Transportation Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
2.
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China

More Information

Author Bio:
ZHAO Yan-qing(1972-)maleassociate professorPhD, +86-29-411-84707761, Yanqing_zhao888@126.com

Article Text (Baidu Translation)

摘要

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。
- 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
Abstract: 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.
- pavement engineering /
- stress pulse duration /
- viscoelasticity /
- 3D finite element method /
- Odemark method /
- dynamic modulus

HTML全文

图 1 有限元模型

Figure 1. Finite element model

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图 2 在2 cm处的应力时程曲线

Figure 2. Stress-time curves at 2 cm

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图 3 在18 cm处的应力时程曲线

Figure 3. Stress-time curves at 18 cm

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图 4 在30 km·h^-1时的应力脉冲时间随深度变化曲线

Figure 4. Stress pulse duration-depth curves at 30 km·h^-1

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图 5 在60 km·h^-1时的应力脉冲时间随深度变化曲线

Figure 5. Stress pulse duration-depth curves at 60 km·h^-1

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图 6 在90 km·h^-1时的应力脉冲时间随深度变化曲线

Figure 6. Stress pulse duration-depth curves at 90 km·h^-1

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图 7 各工况下应力脉冲时间曲线

Figure 7. Stress pulse duration curves under various conditions

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图 8 动态模量预测结果比较

Figure 8. Comparison of predicted dynamic moduli

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表 1 沥青路面结构

Table 1. Asphalt pavement structure

层位	材料类型	厚度/cm	性质
1	改性沥青SMA13	4	粘弹性
2	改性沥青Sup20	6	粘弹性
3	普通沥青Sup25	8	粘弹性
4	级配碎石	40	弹性模量为250 MPa
5	路基		弹性模量为60 MPa

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参考文献(10)

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