1. Institute of Electric Power, State Grid Zhejiang Electric Power Limited Company, Hangzhou 310006, China 2. Institute of Thermal Science and Power Systems, Zhejiang University, Hangzhou 310027, China
Five types of soils with depth of 0.7~1.2 m were collected in Zhejiang Province in order to measure the thermal conductivity of backfill soil for buried power cable and explore its variation with water mass fraction. Fully compacted samples with water mass fraction of 0%, 5%, 10%, 15%, 20%, and 25% were prepared. The thermal conductivity of each sample was determined by thermal probe method at (20±1) °C. Results show that the fastest range that thermal conductivity increases monotonically with water mass fraction is diverse among different soils, such as 10%~15% for coarse soil, 15%~20% for fluvo-aquic soil, and 20%~25% for red soil. When the water mass fraction exceeds 20%, the thermal conductivity of paddy soil, red soil and yellow soil increases monotonically with water mass fraction, but that of coarse soil and fluvo-aquic soil decreases. The thermal conductivity of different soils greatly varies. For example, the thermal conductivity of coarse soil is about twice that of yellow soil under the same conditions.
Hong-kun LV,Yu-hao WU,Yan-hao FENG,Ming-jun WANG,Zi-tao YU. Measurement of thermal conductivity of backfill soil for buried power cable. Journal of ZheJiang University (Engineering Science), 2020, 54(10): 1971-1977.
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