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	Experimental and analytical investigation on frost heave characteristics of an unsaturated moderately expansive clay
	Luo, Jun1; Tang, Liang1,4; Ling, Xianzhang1,2; Geng, Lin3
刊名	COLD REGIONS SCIENCE AND TECHNOLOGY
	2018-11-01
卷号	155页码:343-353
关键词	Moderately expansive clay Frost heave characteristic Step-freezing test Open system Physico-empirical approach
ISSN号	0165-232X
DOI	10.1016/j.coldregions.2018.08.023
通讯作者	Tang, Liang(tangliang@hit.edu.cn)
英文摘要	Expansive clay, a kind of clayey soil, is widely distributed in seasonally frozen regions. Numerous studies have attempted to explain the frost heave characteristics of clayey soils, but few of them have paid attention to the frost heave characteristics of unsaturated expansive clay, especially considering the influence of swelling properties. In this study, a series of freezing temperature tests and step-freezing tests on an unsaturated moderately expansive clay and a silty clay were conducted. The silty clay was taken as a reference. The testing program, experimental results are presented and discussed, especially to the freezing point, evolution of temperature in the specimens at different elevations, water content distributions and cryostructures after freezing, frost heave during freezing, and state paths. In this regard, a physico-empirical approach is developed to obtain the relationship between freezing point and initial water contents. Experimental data show that the freezing point of expansive clay varies greatly with initial water contents. The obvious highly exothermic phase change occurs in expansive clay during the early stage of freezing with penetration decrease lagging behind. The heave amount of expansive clay is made up of the displacement caused by increasing water content in the unfrozen zone due to freezing-induced water flux and the frost heave. The state paths show significant variation of saturation and dry density of expansive clay after freezing and have a practical advantage of indicating the extent of possible expansion while thawing. On this basis, the state and variation of pore water are highlighted as the critical primary factors in determining the frost heave characteristics of unsaturated expansive clay in open system. Overall, this study further enhances the understanding of frost heave characteristics of the unsaturated moderately expansive clay.
收录类别	SCI
WOS关键词	SOIL FREEZING-POINT ; FINE-GRAINED SOILS ; INDEX PROPERTIES ; FROZEN SOILS ; MODEL ; SUSCEPTIBILITY ; MIGRATION ; CURVE
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000444514700032
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558307
专题	寒区旱区环境与工程研究所
通讯作者	Tang, Liang
作者单位	1.Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Heilongjiang, Peoples R China 2.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China 3.Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China 4.Chongqing Univ, Key Lab New Technol Construct Cities Mt Area, Chongqing 400044, Peoples R China
推荐引用方式 GB/T 7714	Luo, Jun,Tang, Liang,Ling, Xianzhang,et al. Experimental and analytical investigation on frost heave characteristics of an unsaturated moderately expansive clay[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2018,155:343-353.
APA	Luo, Jun,Tang, Liang,Ling, Xianzhang,&Geng, Lin.(2018).Experimental and analytical investigation on frost heave characteristics of an unsaturated moderately expansive clay.COLD REGIONS SCIENCE AND TECHNOLOGY,155,343-353.
MLA	Luo, Jun,et al."Experimental and analytical investigation on frost heave characteristics of an unsaturated moderately expansive clay".COLD REGIONS SCIENCE AND TECHNOLOGY 155(2018):343-353.

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