Journal Published Online: 13 March 2018
Volume 46, Issue 6

Evolution of the Temperature Field of the Subgrade in the Permafrost Regions of the Great Khingan Mountains

CODEN: JTEVAB

Abstract

The distribution characteristics and changing trend of the temperature field of the subgrade in the permafrost region were simulated by using an enthalpy value-based numerical method. The Greater Khingan Mountains were selected as a case, and the environmental conditions, including solar radiation, temperature, wind speed, route trend, and subgrade construction mode, were analyzed. Results demonstrated that the values calculated by the established model agreed with the measured values in temperature holes, which indicated the feasibility of the model. The temperature field of the subgrade in the permafrost regions changed in an approximately cyclical fluctuation of the cosine form. The annual changing curve of ground temperature slowed down gradually with the increase of depth, accompanied by a phase lag. A noncohesive state was observed within a certain depth range between the active layer and permafrost in cold winter. The maximum thawed depth increased linearly as time increased. The rate of subgrade melting presented nonlinear changes with increasing time. The growth rate was fastest in the first five years. After 5 years, subgrade melting decreased generally with time and became stable after 15 years, reaching zero at the 30th year.

Author Information

Liu, Haiping
Northeast Forestry University, Harbin, Heilongjiang, China Heilongjiang Institute of Technology, Harbin, Heilongjiang, China
Ding, Lin
Northeast Forestry University, Harbin, Heilongjiang, China Heilongjiang University, Harbin, Heilongjiang, China
Yang, Yang
Northeast Forestry University, Harbin, Heilongjiang, China Heilongjiang Institute of Technology, Harbin, Heilongjiang, China
Guo, Meng
Beijing University of Technology, College of Architecture and Civil Engineering, Chaoyang District, Beijing, China
Wang, Yiqi
Heilongjiang Institute of Technology, Harbin, Heilongjiang, China
Pages: 11
Price: $25.00
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Details
Stock #: JTE20170085
ISSN: 0090-3973
DOI: 10.1520/JTE20170085