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| Measurement of thermal conductivity of backfill soil for buried power cable |
Hong-kun LV1( ),Yu-hao WU2,*(),Yan-hao FENG2,Ming-jun WANG1,Zi-tao YU2 |
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 |
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Abstract 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.
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Received: 18 September 2019
Published: 28 October 2020
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Corresponding Authors:
Yu-hao WU
E-mail: hongkunlv@126.com;11827030@zju.edu.cn
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直埋电缆回填土导热系数测试
为了测定直埋电缆回填土的导热系数并探究导热系数随水质量分数的变化规律，采集浙江省境内掩深为0.7~1.2 m的5种土壤，分别配制了水质量分数为0%、5%、10%、15%、20%和25%的充分压实的试样，利用热探针法测试了各试样在(20±1) °C时的导热系数. 结果表明：不同土壤的导热系数随水质量分数递增最快的区间不同，如粗骨土为10%~15%，潮土为15%~20%，红壤为20%~25%；水质量分数超过20%后，水稻土、红壤和黄壤的导热系数随着水质量分数递增，粗骨土和潮土的导热系数减小；不同土壤的导热系数差别较大，如粗骨土的导热系数是相同条件下黄壤的2倍左右.
关键词：
回填土,
压实,
水质量分数,
热探针法,
导热系数
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