| The problem of engineering disease prevention of pavement structure has always been a huge problem in the field of highway research.The area along the Wudu section of Beijing-new Expressway is located in the typical temperate continental arid climate zone,where the annual temperature difference is large and the solar radiation is strong.Due to its unique geographical location and climatic conditions,the pavement is more likely to induce high temperature ruts,low temperature cracking of asphalt layer and temperature shrinkage cracks of semi-rigid base.The existing researches on pavement diseases have not established comprehensive and systematic evaluation standards for expressways in Xinjiang.Therefore,this paper focuses on the risk prediction study of the structural damage of the road surface in the Wu-wood section of Beijing-Urumqi Expressway,and carries out a field investigation on the asphalt pavement in the Wutong Daquan-Qianshan section of Beijing-Urumqi Expressway.Based on the temperature and radiation conditions along the section,the induced conditions of the pavement damage are analyzed.According to the material characteristics of the pavement,asphalt layer and semi-rigid base under extreme temperature,The risk levels of high temperature rutting,low temperature cracking of asphalt layer and temperature shrinkage cracking of semirigid base are put forward.Based on the spatial and temporal characteristics of extreme temperature distribution at each structural layer of the road surface,the linear regression equation between surface temperature and extreme temperature at each structural layer of the road surface was established.Then,combined with the satellite remote sensing data of surface temperature,the distribution law of extreme temperature at each structural layer along the Wumu section of the Beijing-Urumqi Expressway was obtained.Statistical analysis was made on the occurrence probability of disease risk in each section,and the main conclusions were summarized as follows:(1)The number of asphalt pavement cracks in Wutong Daquan-Jingerquan,Yiwu-Yanchi and Yanchi-Qianshan Road sections is relatively large and mainly through type cracks.The distribution of transverse cracks on semi-rigid base surface is similar to that of asphalt pavement.A large number of diseases of pavement structure in the study area are mainly temperature cracks,which have the risk of causing a large number of high temperature ruts after large-scale traffic.(2)From high to low,the risks are divided into first-level risk,second-level risk and third-level risk,and the risk levels of high-temperature rutting on the Beijing-new highspeed Wuwood pavement,low-temperature cracking risk levels of asphalt layer and temperature-shrinkage cracking risk levels of semi-rigid base are proposed respectively.(3)The lowest daily temperature of each structural layer of pavement in the study section appeared between 5 a.m.and 7 a.m.,and the highest temperature appeared between 15 a.m.and 16 a.m.The risk of high temperature rutting is mainly concentrated in July,when the highest temperature of pavement exceeds 70 ℃.The risk of low temperature cracking of asphalt layer and temperature shrinking crack at the bottom of semi-rigid base mainly appears in January,when the lowest temperature of asphalt layer is lower than-20 ℃.(4)The probability of high temperature ruts in Wutong Daquan-Jingerquan section and Jingerquan-Xiamagua section is high,the probability of first grade low temperature cracking in the asphalt layer of Qianshan-Kuisu section is high,and the risk of first grade temperature shrinkage cracks is high in Qianshan-Kuisu section,Kuisu-Balikun section,Luotuojingzi-Xiaonaogu dam and Xiaonaogu dam-Muluo section. |
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