直埋电缆回填土导热系数测试

doi:10.3785/j.issn.1008-973X.2020.10.014

浙江大学学报(工学版)

2020, Vol. 54

Issue (10): 1971-1977 DOI: 10.3785/j.issn.1008-973X.2020.10.014

能源工程、机械工程

直埋电缆回填土导热系数测试

吕洪坤1(

),吴宇豪2,*(

),冯彦皓2,汪明军1,俞自涛2

1. 国网浙江省电力有限公司电力科学研究院，浙江杭州 310006
2. 浙江大学热工与动力系统研究所，浙江杭州 310027

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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摘要：

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

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.

Key words: backfill soil compaction water mass fraction thermal probe method thermal conductivity

收稿日期: 2019-09-18 出版日期: 2020-10-28

CLC:

TK 121

基金资助: 国网浙江省电力有限公司资助项目（5211DS17002N）

通讯作者: 吴宇豪 E-mail: hongkunlv@126.com;11827030@zju.edu.cn

作者简介: 吕洪坤（1981—），男，高级工程师，从事电力系统热能动力研究.orcid.org/0000-0002-0925-271X. E-mail： hongkunlv@126.com

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引用本文:

吕洪坤,吴宇豪,冯彦皓,汪明军,俞自涛. 直埋电缆回填土导热系数测试[J]. 浙江大学学报(工学版), 2020, 54(10): 1971-1977.

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.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.10.014 或 http://www.zjujournals.com/eng/CN/Y2020/V54/I10/1971

图 1 热探针结构示意图

表 1 土壤采样情况统计

图 2 土壤试样制备及测试所用的主要仪器和设备

图 3 土壤试样制备流程示意图

图 4 土壤导热系数的测试装置

表 2 各土壤试样导热系数样本标准差

图 5 各土壤试样干密度-水质量分数曲线

图 6 各土壤试样导热系数-水质量分数曲线

图 7 土壤中的颗粒、团聚体、孔隙和水分示意图

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