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DOI	10.1016/j.ijheatmasstransfer.2018.02.118
	Variation of the thermal conductivity of a silty clay during a freezing-thawing process
	Zhang, Mingyi; Lu, Jianguo; Lai, Yuanming; Zhang, Xiyin
发表日期	2018
ISSN	0017-9310
EISSN	1879-2189
起始页码	1059
结束页码	1067
卷号	124
英文摘要	The thermal conductivity of soils is a key factor in calculating soil heat transfer and analyzing temperature fields of geotechnical engineering in cold regions. We measured the thermal conductivity of a silty clay by a QuickLine-30 Thermal Properties Analyzer during a freezing-thawing process, and analyzed the variation of the thermal conductivity. We then calculated the thermal conductivity under the same experimental conditions using the three general models, i.e. weighted arithmetic mean model, weighted harmonic mean model, and weighted geometric mean model. The results show that for the thawed or frozen soils with little variation of unfrozen water content, the thermal conductivity is slightly influenced by temperature; however, for the soils in the major phase transition zone, the variation of the thermal conductivity with temperature is significant. After a freezing-thawing process, the thermal conductivities of the soils with higher initial dry densities become smaller, while those with lower initial dry densities become larger. We also found that the variation of porosity and hysteresis effect of unfrozen water content cause the difference of the thermal conductivity of soils between freezing and thawing processes, however the variation of porosity acts as the primary role. Furthermore, the three general models can all be used to calculate the thermal conductivity of soils; however, the weighted geometric mean model agrees best with the experimental data. (C) 2018 Elsevier Ltd. All rights reserved.
英文关键词	Thermal conductivity; Dry density; Porosity; Water content; Silty clay; Freezing-thawing process
语种	英语
WOS研究方向	Thermodynamics ; Engineering ; Mechanics
WOS类目	Thermodynamics ; Engineering, Mechanical ; Mechanics
WOS关键词	PERMAFROST REGIONS ; VOLUME CHANGES ; WATER-CONTENT ; PERMEABILITY ; PREDICTION ; 2-PHASE ; MEDIA ; SOILS ; MODEL
WOS记录号	WOS:000437077100091
来源期刊	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239465
作者单位	[Zhang, Mingyi; Lu, Jianguo; Lai, Yuanming; Zhang, Xiyin] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China; [Zhang, Mingyi; Lu, Jianguo; Lai, Yuanming] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Zhang, Xiyin] Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Mingyi,Lu, Jianguo,Lai, Yuanming,et al. Variation of the thermal conductivity of a silty clay during a freezing-thawing process[J],2018,124.
APA	Zhang, Mingyi,Lu, Jianguo,Lai, Yuanming,&Zhang, Xiyin.(2018).Variation of the thermal conductivity of a silty clay during a freezing-thawing process.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,124.
MLA	Zhang, Mingyi,et al."Variation of the thermal conductivity of a silty clay during a freezing-thawing process".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 124(2018).