Calculating the Effective Thermal Conductivity Coefficient of the Frozen Layerin Thermal-conservative and Freezing-resistant Cannel
ZHANG Yufeng
HE Wuquan
ZHAO Yanlin
Abstract：Empirical methods commonly used for calculating the effective thermal conductivity coefficient of the frozen layer in thermal-conservative and freezing-resistant cannels could give rise to considerable errors. To over-come this problem, we proposed a fractal-based model in this paper to calculate effective thermal conductivity co-efficient of silty clay in permafrost in the cold region of northern China. We calculated the coefficient C using da-ta obtained from Ha Matong Irrigation District and then applied and tested the model against data obtained from-Hetao Irrigation District in Inner Mongolia, Chong Huer Irrigation District in Sinkiang, and Ha Matong Irrigation District in Heilongjiang. The results showed that the calculated thickness of polyphenyl plate was almost the same as the optimal thickness with an error of just 7.0%, proving the accuracy of the model. We also calculated the effective thermal conductivity coefficient of silt and silty clay in permafrost. The model can be used in re-gions where groundwater table is shallow and there is soil water movement when soils are freezing with pro-longed frost heaves.
Keywords：anti-seepage channelsheat preservation and frozen preventionfractal theoryeffective thermal con-ductivity coefficient
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 69-73 )