Experimental study on variation of thermal conductivity of superficial submarine soils

doi:10.3969/j.issn.1001-909X.2020.01.003

Abstract

Abstract: From the continental shelf at the east of Hangzhou Bay, 28 sample columns were acquired. The thermal conductivities of soils at different depths (0.2 m,1.0 m and 1.8 m) from these cores were tested by thermal probe. Correspondingly, particle size of the soils were also tested. Through the comparison between six kinds of soils in the study area, It was found that those with higher sand content (>10%) have bigger thermal conductivities. Besides, water content and dry density have significant effect on thermal conductivities of certain type of soil. Average value of thermal conductivity for superficial soils in Hangzhou Bay area,mixed deposit area and shelf sandy area are respectively 1.25 W·m^-1·K^-1, 1.45 W·m^-1·K^-1 and 1.46 W·m^-1·K^-1, which indicates that thermal conductivities increase from the coast to open waters. On the other hand, vertical variation of thermal conductivities shows that spatial factors including water depth and buried depth have no direct effect on the thermophysical properties of seabed soils.

Key words: marine soils, thermal conductivity, sand content, spatial distribution

CLC Number:

TU411.2

HE Xutao, LIN Xiaobo, XU Jianliang, LI Shiqiang, YANG Jinghe, XU Haining. Experimental study on variation of thermal conductivity of superficial submarine soils[J]. Journal of Marine Sciences, 2020, 38(1): 20-26.

References

[1] 陶兆祥,张景森. 大含水(冰)量融冻土导热系数的测定研究[J]. 冰川冻土,1983,5(2):75-80.
TAO Zhaoxiang, ZHANG Jingsen. The thermal conductivity of thawed and frozen soils with high water(ice) content[J]. Journal of Glaciology and Cryopedology, 1983, 5(2): 75-80.
[2] 陈则韶,葛新石,顾毓沁. 量热技术和热物性测定[M]. 合肥:中国科学技术大学出版社,1990.
CHEN Zeshao, GE Xinshi, GU Yuqin. Calorimetric technique & measurement of thermophysical properties[M]. Hefei: University of Science and Technology of China Press, 1990.
[3] 张旭,高晓兵. 华东地区土壤及土沙混合物导热系数的实验研究[J].暖通空调,2004,34(5):83-89.
ZHANG Xu, GAO Xiaobing. Experimental study on thermal conductivity of soil and its mixture with sand[J]. Journal of HV & AC, 2004, 34(5): 83-89.
[4] 王铁行,刘自成,卢靖. 黄土导热系数和比热容的实验研究[J]. 岩土力学,2007,28(4):655-658.
WANG Tiexing, LIU Zicheng, LU Jing. Experimental study on coefficient of thermal conductivity and specific volume heat of loess[J]. Rock and Soil Mechanics, 2007, 28(4): 655-658.
[5] 苏天明,刘彤,李晓昭,等. 南京地区土体热物理性质测试与分析[J]. 岩石力学与工程学报,2006,25(6):1278-1283.
SU Tianming, LIU Tong, LI Xiaozhao, et al. Test and analysis of thermal properties of soil in Nanjing district[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(6): 1278-1283.
[6] 余正. 土壤的比热和热导率的测量[J]. 土壤,1986(1):48-51.
YU Zheng. Measurement of specific heat and thermal conductivity of soils[J].Soils, 1986(1): 48-51.
[7] 汪承维. 人工冻结盐渍土导热系数试验研究及其应用[D]. 淮南:安徽理工大学,2014.
WANG Chengwei. Tests about coefficient of thermal conductivity of artificial freezing saline soil and application[D]. Huainan: Anhui University of Science and Technology, 2014.
[8] 邓友生,何平,周成林. 含盐土导热系数的试验研究[J]. 冰川冻土,2004,26(3):319-323.
DENG Yousheng, HE Ping, ZHOU Chenglin. An experimental research on the thermal conductivity coefficient of saline soil[J]. Journal of Glaciology and Geocryology, 2004, 26 (3): 319-323.
[9] 张洪岩. 某海滨地区淤泥土导热系数的试验研究[C]//2016年全国工程勘察学术大会论文集,2016:185-191.
ZHANG Hongyan. The test research on the thermal conductivity of mucky soil in a coastal area[C]//Proceedings of the National Conference on Engineering Investigation, 2016: 185-191.
[10] 李亚敏. 南海北部陆坡深水区海底原位热流测量[J]. 地球物理学报,2010,53(9):2161-2170.
LI Yamin. Seafloor in-situ heat flow measurements in the deep-water area of the northern slope, South China Sea[J]. Chinese Journal of Geophysics, 2010, 53(9): 2161-2170.
[11] 陈守义. 用热针法测定土的热导率[J]. 岩土力学,1989,10(1):61-65.
CHEN Shouyi. Measurement of soil thermal conductivity with thermal needle method[J]. Rock and Soil Mechanics, 1989, 10(1): 61-65.
[12] EWEN J, THOMAS H R. The thermal probe—a new method and its use on an unsaturated sand[J]. Geotechnique, 1987, 37(1): 91-105.
[13] HAMDEH N H. Measurement of the thermal conductivity of sandy loam and clay loam soils using single and dual probes[J]. Journal of Agricultural Engineering Research, 2001, 80(2): 209-216.
[14] 刘苍字,董永发. 杭州湾的沉积结构与沉积环境分析[J]. 海洋地质与第四纪地质,1990,10(4):53-65.
LIU Cangzi, DONG Yongfa. Sedimentary textures and environments of the Hangzhou Bay[J]. Marine Geology & Quaternary Geology, 1990, 10(4): 53-65.
[15] 庄迎春,谢康和,孙友宏. 砂土混合材料导热性能的试验研究[J]. 岩土力学,2005,26(2):261-264.
ZHUANG Yingchun, XIE Kanghe, SUN Youhong. Experimental study on thermal conductivity of mixed materials of sand and bentonite[J].Rock and Soil Mechanics, 2005, 26(2): 261-264.
[16] VRIES D E. A nonstationary method for determining thermal conductivity of soil in situ[J]. Soil Science, 1952, 73(2): 83-90.
[17] FORD G L, STEINMANIS J E. The importance of weather dependent processes on underground cable design[C]//Proceedings of the Symposium on Underground Cable Thermal Backfill, Held in Toronto, Canada, September 17 and 18, 1981, 1982: 157-166.
[18] MALTEN K C, KIRBY M J, WILLIAMS J A. Guidelines for the design and installation of transmission and distribution cables using guided drilling systems[R]. United States: 1995.
[19] BALASKA T A, MCKEAN A L, MERRELL E J. Long-time heat runs on underground cable in a sand hill[J]. Transactions of the American Institute of Electrical Engineers Part III Power Apparatus & Systems, 2008, 79(3): 757-770.