SEGJ Technical Conference

Estimation of soil thermal resistance around underground power transmission line using geophysical surveys 2 - Electrical and S-wave refraction surveys using real scale artificial soil -

Abstract Design of underground power transmission lines requires simple and effective techniques for estimating soil thermal resistance which is the most important factor to determine the capacity of power lines. We performed field experiments with a real size soil structure model with the backfill materials to estimate thermal resistance distribution by analytical cross sections of the electric resistivity method. From the results, the distribution of the artificially created soil structure was evaluated by the S-wave velocity distribution. The thermal resistance distribution estimated by the electrical resistivity distribution using the developed formula was consistent with that measured by thermal resistance meters. We also found that the thermal resistance decreased when water saturation increased. These results show that thermal resistance distribution of soil is estimated by the combination survey of the electrical method and the S-wave seismic method.