Thermal Interaction between Permafrost and the Qinghai-Tibet Railway
Publication: Journal of Cold Regions Engineering
Volume 24, Issue 4
Abstract
Measures were taken to protect the thermal regime of the roadbed embankment after construction and to lower permafrost temperatures in the rich-ice and warm permafrost regions along the Qinghai-Xizang Railway. However, these measures were taken only for some sections of the railway, leaving many sections unprotected. This article addresses those areas where no measures were taken and presents analysis of the variation of soil temperatures under the embankment in seasonal frozen soil areas, degrading permafrost areas, and warm and cold permafrost areas. The results show that soil temperatures, maximum seasonal freezing depth, and the permafrost table under the embankment differ according to the different frozen soil areas after embankment construction. In seasonal frozen soil areas and degraded permafrost areas, the seasonal frost layer remained frozen the next year under the shaded shoulder of the embankment. In degrading permafrost areas, a thaw layer between the permafrost table and the bottom of the seasonal frost formed under the embankment. In warm permafrost areas, the permafrost table under the embankment was unstable and soil temperatures near the permafrost table showed an obvious increasing trend. In cold permafrost areas, the permafrost table under the embankment was clearly raised and temperature lowered in the soil near the permafrost table, which is advantageous to permafrost thermal stability under the embankment. In particular, the differ-ence in solar radiation from the slope exposed to the sun to the shady slope of the embankment is responsible for the difference in the soil thermal regime and the permafrost table, which potentially can affect roadbed stability.
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Acknowledgments
We would like to express our gratitude to anonymous reviewers for their constructive and insightful comments and suggestions. This research is funded by the Outstanding Youth Foundation Project, the National Natural Science Foundation of China (Grant No. NNSFC40625004), Western Project Program of the Chinese Academy of Sciences (Grant No. UNSPECIFIEDKZCX2-XB2-10), and the Program for Innovative Research Group of Natural Science Foundation of China (Grant No. NNSFC40821001).
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© 2010 ASCE.
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Received: Mar 14, 2009
Accepted: Jan 11, 2010
Published online: Jan 14, 2010
Published in print: Dec 2010
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