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DEFORMATION CHARACTERISTICS OF THE MAIN EMBANKMENTS OF THE QINGHAI-TIBET RAILWAY IN PERMAFROST REGIONS
Session: Infrastructure Performance in Cold Regions II / Performance des infrastructures en régions nordiques II
Fujun Niu, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences (China)
Minghao Liu, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences (China)
Libo Wu, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences (China)
Guodong Cheng, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences (China)
Qingbai Wu, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences (China)
A principle of ‘cooling roadbed’ was applied during the construction of the Qinghai-Tibet Railway (QTR) in permafrost regions. The main embankments include crushed-rock basement embankment (CRBE), crushed-rock sloped embankment (CRSE) and U-shaped crushed-rock embankment (UCRE), along with traditional embankment (TE). Eleven years of monitored data show that, the deformation of all the embankments generally show as settlement. Among the four types of the embankments, the CRBE has a maximum settlement with a value of more than 31 cm. The deformations are related to geological conditions of the underlain permafrost, thermal regimes of the roadbeds. For an embankment, different deformations occur in the two shoulders with north-facing slope and south-facing slope. Therefore, considering the mechanical stability, cooling effect, symmetry of the ground temperature regime, material property and construction technique, UCRE can be recommended for future application. And also some improvement measures for the other embankment structures are proposed.
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