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http://dx.doi.org/10.7843/kgs.2013.29.8.75

Assessment of Surface Boundary Conditions for Predicting Ground Temperature Distribution  

Jang, Changkyu (Graduate Student, Univ. of Science and Technology)
Choi, Changho (Geotechnical Eng. Research Division, SOC Research Institute, Korea Institute of Construction and Technology)
Lee, Chulho (Geotechnical Eng. Research Division, SOC Research Institute, Korea Institute of Construction and Technology)
Lee, Jangguen (Geotechnical Eng. Research Division, SOC Research Institute, Korea Institute of Construction and Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.29, no.8, 2013 , pp. 75-84 More about this Journal
Abstract
Soil freezing is a phenomenon arising due to temperature difference between atmosphere and ground, and physical properties of soils vary upon the phase change of soil void from liquid to solid (ice). A heat-transfer mechanism for this case can be explained by the conduction in soil layers and the convection on ground surface. Accordingly, the evaluation of proper thermal properties of soils and the convective condition of ground surface is an important task for understanding freezing phenomenon. To describe convection on ground surface, simplified coefficient methods can be applied to deal with various conditions, such as atmospheric temperature, surface vegetation conditions, and soil constituents. In this study, two methods such as n-factor and convection coefficient for the convective ground surface boundary were applied within a commercial numerical program (TEMP/W) for modeling soil freezing phenomenon. Furthermore, the numerical results were compared to laboratory testing results. In the series of the comparison results, the convection coefficient is more appropriate than n-factor method to model the convective boundary condition.
Keywords
Ground surface boundary; n-factor; Convection coefficient; Frozen soil; Heat transfer;
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