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| DOI： |
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| Calculating the Effective Thermal Conductivity Coefficient of the Frozen LCalculating the Effective Thermal Conductivity Coefficient of the Frozen Layerin Thermal-conservative and Freezing-resistant Cannel ayerin Thermal-conservative and Freezing-resistant Cannel |
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ZHANG Yufeng, HE Wuquan, ZHAO Yanlin
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Yangling Vocational & Technical College, Yangling 712100, China； College of Water Resources and Architectural Engineering , Northwest A&F University, Yangling 712100, China
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| 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 overcome this problem, we proposed a fractal-based model in this paper to calculate effective thermal conductivity coefficient of silty clay in permafrost in the cold region of northern China. We calculated the coefficient C using data obtained from Ha Matong Irrigation District and then applied and tested the model against data obtained fromHetao 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 regions where groundwater table is shallow and there is soil water movement when soils are freezing with prolonged frost heaves. |
| Key words: anti-seepage channels; heat preservation and frozen prevention; fractal theory; effective thermal conductivity coefficient. |
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