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Thermal Stability of Roadbeds of the Qinghai-Tibet Railway in Permafrost Regions and the Main Freezing-thawing Hazards(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第02期
Page:
196-206
Research Field:
地质工程
Publishing date:

Info

Title:
Thermal Stability of Roadbeds of the Qinghai-Tibet Railway in Permafrost Regions and the Main Freezing-thawing Hazards
Author(s):
NIU Fu-jun; MA Wei; WU Qing-bai
State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
Keywords:
the Qinghai-Tibet Railway;  permafrost;  roadbed structure;  active cooling;  thermal stability;  freezing-thawing hazard
PACS:
P642.14
DOI:
-
Abstract:
The background of permafrost degradation in the Qinghai-Tibet Plateau and its engineering impact in the region were introduced. Then based on the results of geo-hazard investigations and ground-temperature monitoring of the roadbeds along the Qinghai-Tibet Railway in the permafrost regions, the development of ground temperature, thermal stability and secondary freezing-thawing hazards since 2002 were analyzed. The results showed that the roadbeds in the permafrost regions are stable in the whole since it was open to traffic in 2006. The train speed reaches 100 km/h, which achieves the design requirements. In-situ monitored results indicated that thermal stability of the roadbed constructed with a principle of “active cooling” method is much better than that of traditional roadbed. Among the cooling roadbeds, the duct-ventilated roadbed, sunshine-shield roadbed and U-type crushed-rock roadbed efficiently cooled the below permafrost. The roadbed with crushed-rock basement is unsymmetrical in thermal regime, and the thermal stability of the traditional roadbed is very weak, especially in the regions where permafrost is under intense degradation. Such sections should be reinforced considering the local climate factors. Along the railway, some main geo-hazards include thawing settlement, frost-heave and freezing-thawing induced hazards, and all of them might potentially influence the roadbed stability with settlement, burying and laterally thermal erosion. Currently the most serious one is the roadbed settlement in embankment-bridge transition section.

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Last Update: 2011-06-20