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Analysis on Surface Troubles of the Qinghai-Tibet Highway

DOU Ming-jian 1 ,HU Chang-Shun 1 ,DUJI Ruo-bu 2 ,HE Zi-wen 3 (1. College of Highway, Chang′an University, Xi′an Shaanxi 710064, China; 2. Tibet Tianlu Company, Lhasa Tibet 850000, China; 3. Communication Research Institute of Tibet, Lhasa Tibet 850000, China)  
There are many depressions, waves and cracks on the pavement of the Qinghai-Tibet Highway in permafrost regions. According to investigation, dynamic penetration test, core analysis and deflection test,the relations between the troubles and climate, thawing of permafrost under the embankment, load-bearing capacity of foundation, material of pavement structure layer are discussed in this paper. The conclusion is come that strong ultraviolet ray causes asphalt pavement ageing, low temperature and dry climate cause the strength of concrete pavement and cement- stabilized base lowering, and change in permafrost under the surface causes asphalt pavement depressing and rippling and falling.
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