Thermal Transfer Analysis of Unpaved and Paved Freezing Soil Media Including Buried Pipelines

ABSTRACT

This article reports the unsteady-state heat transfer analysis of unpaved and paved granite soil media in a closed system in order to predict the temperature profiles along a buried pipeline and the frozen penetration depth (FPD). These studies focused on the development of a computational scheme by applying the effective heat capacity model to numerical procedures. The proposed model took into consideration the phase-change effect of in-situ pore water in the frozen fringe. To realize these objectives, several physical values for granite soil of South Korea at various subzero temperatures were determined in laboratory tests. The comparison of results obtained from an unpaved freezing soil medium by the proposed model and the actual performances was valuable in establishing a level of confidence in the application of the theory introduced.

Notes

^a PI is the plasticity index of the soil; C _s,u is the uniformity coefficient of the soil; C _s,c is the coefficient of gradation of the soil; G _s is the specific gravity of the soil; w _s,o (%) is the optimum water content of the soil.

^a .