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DOI	10.1111/ejss.13210
	A hydraulic conductivity model of frozen soils with the consideration of water films
	Ming, Feng; Pei, Wansheng; Zhang, Mingyi; Chen, Lei
通讯作者	Pei, WS (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China.
发表日期	2022
ISSN	1351-0754
EISSN	1365-2389
卷号	73 期号:1
英文摘要	Accurate evaluation of water migration in frozen soils requires the determination of hydraulic conductivity. Most classical predictive models of hydraulic conductivity rely on the pore bundle concept that only accounts for capillary flow and neglects the water film flow. This may underestimate the hydraulic conductivity of frozen soil. In this study, water in the capillary tube was divided into free water and water films with different dynamic viscosities. Then, a novel prediction model for hydraulic conductivity of frozen soil was proposed based on the capillary flow theory. The model parameters can be easily obtained from laboratory tests. The predicted results showed good agreement with tested hydraulic conductivity of 12 frozen soils. When the temperature decreases from 0 to -1 degrees C, the contribution of water films to the hydraulic conductivity of frozen soil becomes large, up to 20%. To further develop the predictive power of the model, the hydraulic conductivity determined by relative change method was recommended. The use of relative hydraulic conductivity can provide a simple form to quantify the influence of unfrozen water content on the hydraulic conductivity of frozen soils. Highlights Free water and water films have different dynamic viscosities in the model. Soil freezing curve was used to predict the hydraulic conductivity of frozen soils. Water film has about 20% contribution to hydraulic conductivity of frozen clay.
关键词	UNSATURATED POROUS-MEDIA FROST HEAVE ICE CLAY
英文关键词	capillary flow; frozen soil; hydraulic conductivity; pore size distribution; unfrozen water content; water films
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000760389400017
来源期刊	EUROPEAN JOURNAL OF SOIL SCIENCE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253751
作者单位	[Ming, Feng; Pei, Wansheng; Zhang, Mingyi; Chen, Lei] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Ming, Feng,Pei, Wansheng,Zhang, Mingyi,et al. A hydraulic conductivity model of frozen soils with the consideration of water films[J]. 中国科学院西北生态环境资源研究院,2022,73(1).
APA	Ming, Feng,Pei, Wansheng,Zhang, Mingyi,&Chen, Lei.(2022).A hydraulic conductivity model of frozen soils with the consideration of water films.EUROPEAN JOURNAL OF SOIL SCIENCE,73(1).
MLA	Ming, Feng,et al."A hydraulic conductivity model of frozen soils with the consideration of water films".EUROPEAN JOURNAL OF SOIL SCIENCE 73.1(2022).