Soil Thermal Resistivity Modeling
Soil thermal properties are of great importance in many engineering projects and other situations where heat transfer takes place through the soil mass. Some of these practical situations are the design and emplacement of high voltage buried power cables, the pipe lines carrying oil and gas and the nuclear waste disposal sites etc. The ?transient state method? of estimating the soil thermal resistivity, involving a laboratory thermal probe, has been used to evaluate the thermal reistivity of various soils in this report. The method is based on the theory that the rate of rise of the temperature of a line heat source is dependent upon the thermal conductivity of the medium, in which it is placed. The method has been further extended to obtain relationships between various factors affecting the thermal resistance of the soils. Various compositions of the soils have also been tested, to simulate a naturally occurring soil deposit. A brief review of various methods of resistivity measurements is presented along with a comparison of the transient state method vis-a-vis with the steady state method.
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