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CLC number: U41

On-line Access: 2021-07-19

Received: 2020-06-07

Revision Accepted: 2021-04-12

Crosschecked: 2021-06-29

Cited: 0

Clicked: 2577

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Hai-lu Yang

https://orcid.org/0000-0002-3188-2013

Feng-yan Sun

https://orcid.org/0000-0003-3169-1724

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Journal of Zhejiang University SCIENCE A 2021 Vol.22 No.7 P.514-527

http://doi.org/10.1631/jzus.A2000259


Effects of accelerated loading on the stress response and rutting of pavements


Author(s):  Hai-lu Yang, Shuai-jun Wang, Ying-hao Miao, Lin-bing Wang, Feng-yan Sun

Affiliation(s):  National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China; more

Corresponding email(s):   fysun@ustb.edu.cn

Key Words:  Accelerated pavement test (APT), Computational simulation, Finite element method, Road rutting, Asphalt concrete, Pavement deformation


Hai-lu Yang, Shuai-jun Wang, Ying-hao Miao, Lin-bing Wang, Feng-yan Sun. Effects of accelerated loading on the stress response and rutting of pavements[J]. Journal of Zhejiang University Science A, 2021, 22(7): 514-527.

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pages="514-527",
year="2021",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2000259"
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%A Shuai-jun Wang
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%DOI 10.1631/jzus.A2000259

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A1 - Feng-yan Sun
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DOI - 10.1631/jzus.A2000259


Abstract: 
In order to assess the difference in performance of pavements under conventional loading and accelerated loading, in this paper, based on the characteristics of pavement strain recovery in accelerated pavement tests (APTs), we define accelerated loading and conventional loading in pavement permanent deformation research. The finite element method is then used to establish a flexible contact model between tire and asphalt pavement. By using simulation, the difference in dynamic stress and rutting of a pavement under the two different loadings is studied. It is discovered that if the APT forms an accelerated loading effect, the pavement will produce deeper rutting under the same axle loading cycle.

加速加载对路面应力响应和车辙的影响

目的:路面加速加载试验(APT)和计算仿真技术具有环境条件控制可调、试验时间短、重复性好等优点,已经成为研究道路性能非常有效的方法.然而,目前尚缺少路面分别在常规加载和加速加载作用下的永久变形性能差异性的研究.为了研究加速加载对路面影响,需要先对路面加速加载进行定义,并在此前提下分析加速加载度路面车辙的影响.
创新点:1. 根据路面应变恢复时间和加载间隔时间的关系定义了对于路面车辙加速加载的效应.2. 通过有限元仿真,对比了相同车速、轴载和作用次数条件下,加速加载与常规加载的对路面车辙的影响.
方法:1. 通过APT研究不同轴载、车速下,路面应变、应力大小和恢复时间(图1-3);2. 建立足尺度路面和轮胎有限元模型(图4-7),研究了更大范围车速与轴载作用下,路面动态应力、应变(图8-11),以及不同荷载下加速加载效应形成的条件;3. 通过施加荷载函数的方法,对比加速加载和常规加载对路面车辙的影响(图13-15).
结论:1. 根据全尺寸路面加速加载过程中监测到的竖向应变恢复时间,将加速加载定义为加载循环中竖向应变未完全恢复即进行重复加载.相邻两次加载之间的时间间隔小于路面应变恢复时间,则路面永久变形会加剧;2. 根据本文对加速加载的定义,加速加载现象的临界时间间隔随着轴重的增加而减小.换言之,在重载下,低速也可能产生加速加载效应;3. 通过有限元仿真分析,比较了路面在常规荷载和加速荷载作用下的车辙.在速度和作用次数相同的情况下,加速加载与常规加载的车辙深度比随载荷的增大而增大.当车速和载荷相同时,加速加载与常规加载的车辙深度比随加载循环次数的增加而逐渐减小.

关键词:路面加速加载试验;数值模拟;有限元法;路面车辙;沥青路面;路面变形

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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