摘要
为了定量表征真实环境冻融作用对沥青混合料疲劳性能影响,通过对青藏高寒区6个典型区域历年冻融作用统计分析,借鉴“积温”相关概念,提出冻融强度量化方法;结合室内冻融循环试验,利用Logistic模型对沥青混合料抗压性能随冻融作用损失率进行回归;提出沥青混合料冻融疲劳破坏概念,量化了青藏高寒区真实环境冻融作用下沥青混合料冻融疲劳破坏寿命。研究结果表明:青藏高寒区平均每年发生冻融作用超过140次,强冻融超过80次;利用冻融温度曲线积分面积可以较好地量化真实环境冻融作用强度;损失率模型与Logistic模型分别可以用来评价沥青混合料抗压性能衰减趋势与损失率变化趋势;利用冻融疲劳破坏可以将室内冻融试验下冻融疲劳破坏作用次数转换为真实环境中不同冻融强度下冻融作用次数,并得到了青藏高寒区6个典型区域不同冻融强度下的冻融疲劳破坏寿命;在自然冻融作用下沥青路面运营不超过5年(只考虑强冻融)将发生冻融疲劳破坏。
In order to quantitatively characterize the impact of freeze-thaw action on fatigue properties of asphalt mixture in real environment,aquantitative method of freeze-thaw strength was proposed,based on the statistical analysis of freeze-thaw action over the years in six typical regions in Qinghai-Tibet Plateau cold region and the concept of accumulated temperature.Combined with the laboratory freeze-thaw cycle test,Logistic model was used to regression the loss rate of asphalt mixture's compressive properties with freeze-thaw action.The concept of freezing-thawing fatigue failure of asphalt mixture was proposed,and the freeze-thaw fatigue failure life of asphalt mixture was quantified under freeze-thaw action in real environment in Qinghai-Tibet Plateau cold region.The results show that there are more than 140freeze-thaw events and more than 80strong freeze-thaw events in the Qinghai-Tibet Plateau cold region every year.The integrated area of freeze-thaw temperature curve can be used to quantify the real environmental freeze-thaw intensity.The loss rate model and Logistic model can be used to evaluate the decay trend and the change trend of loss rate of asphalt mixture compressive performance respectively.The freeze-thaw fatigue failure times under different freeze-thaw intensities can be converted into freeze-thaw fatigue failure times under different freeze-thaw intensities in real environment,by using freeze-thaw fatigue failure times under different freezethaw intensities in six typical regions in Qinghai-Tibet Plateau cold region.It is concluded that the freeze-thaw fatigue failure damage will occur to asphalt pavement in natural freeze-thaw environment for less than 5years(only considering strong freeze-thaw).12tabs,8figs,25refs.
作者
司伟
张博文
杨若聪
李政雄
乔次仁
马骉
SI Wei;ZHANG Bo-wen;YANG Ruo-cong;LI Zheng-xiong;QIAO Ci-ren;MA Biao(Key Laboratory of Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,Shaanxi,China;Postdoctoral Research Station,Tibet Tianlu Co.,Ltd,Lhasa 850000,Tibet,China;Tibet Tianlu Co.,Ltd,Lhasa 850000,Tibet,China)
出处
《长安大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第3期11-21,共11页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(52278430)
西藏自治区自然科学基金项目(XZ202101ZR0046G)
中国博士后科学基金项目(2022MD713805)
关键词
道路工程
青藏高寒区
沥青混合料
冻融作用
疲劳破坏
真实环境
road engineering
Qinghai-Tibet Plateau cold region
asphalt mixture
freeze-thaw
fatigue
real environment
作者简介
司伟(1986-),男,甘肃会宁人,副教授,工学博士,博士后,E-mail:siwei@chd.edu.cn。
