Research on the Long - term Stability of Subgrade in Cold Region and Its Effect

SUN Wen; WU Ya - ping; GAO Zun - ming

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Journal of Railway Engineering Society ›› 2015, Vol. 32 ›› Issue (9) : 35-40.

Geology and Subgrade

Research on the Long - term Stability of Subgrade in Cold Region and Its Effect

SUN Wen，WU Ya - ping，GAO Zun - ming

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Abstract

Research purposes ： Theory of problem study of the long - term stability of subgrade in cold region still can not fully meet the needs of practical engineering. The low embankment structure of short， medium and long term reliability and permafrost environment stability in cold area was predicted， and it provides the theoretical support for subgrade maintenance and possible disease management during the operation.
Research conclusions: (1) In order to ensure the long - term stability of the subgrade，it is necessary to take measures to protect the frozen soil. The heat pipe is a good measure. (2) In the process of protecting the frozen soil，the cooling effect of the heat pipe is obvious，and the heat pipe subgrade can counteract the adverse effect caused by the climate warming to the subgrade. (3) The heat preservation effect of the subgrade is also significant，the higher the subgrade the better the insulation effect of frozen soil，the lower the effect of the insulation of the frozen soil is worse. (4) When the subgrade height is lower than some limit，it can not only play the role in insulation of the frozen soil，but will make the temperature of frozen earth temperature rise. (5) The research results can provide references for the design and renewal of various subgrade structures in the cold regions of China.

Key words

cold region / subgrade / long - term stability / engineering measures / insulation effect

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SUN Wen, WU Ya - ping, GAO Zun - ming. Research on the Long - term Stability of Subgrade in Cold Region and Its Effect[J]. Journal of Railway Engineering Society, 2015, 32(9): 35-40

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