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DOI	10.1016/j.coldregions.2018.01.007
	Experimental study on the freezing-thawing deformation of a silty clay
	Lu, Jianguo; Zhang, Mingyi; Zhang, Xiyin; Pei, Wansheng; Bi, Jun
发表日期	2018
ISSN	0165-232X
EISSN	1872-7441
起始页码	19
结束页码	27
卷号	151
英文摘要	The freezing-thawing deformation is a key factor in determining damages for engineering structures in cold regions. Based on the laboratory experiments, the characteristics of the freezing-thawing deformation were analyzed, as well as the variation of the matric suction. The results show that in each freeze-thaw cycle, the freezing-thawing deformation can be divided into five stages, i.e. cold shrink, fast frost heave, slow frost heave, thermal bulge and thaw settlement. At the onset of each cooling process, the cold shrink occurs and the freezing-thawing deformation decreases slightly; and then, with the decreased temperature, the freezing-thawing deformation rapidly increases at the beginning of freezing (fast frost heave); and subsequently slowly increases with freezing. During the warming processes, the bulge occurs with the rapid increase of the ambient temperature; later, with the thawing of ice, the freezing-thawing deformation decreases. Besides, there are similar changing trends for the freezing-thawing deformation and the matrix suction during the freezing-thawing processes. However, their changing mechanisms are completely different, and the soil matric suction has a stronger sensitivity to the variation of the volumetric unfrozen water content. Furthermore, the effect of freeze-thaw cycles on the characteristic variables of the freezing-thawing deformation, such as cold shrink, net deformation, frost heave coefficient and thaw-settlement coefficient, mainly occurs in the first freeze-thaw cycle, which may be due to the fact that the first freeze-thaw cycle has a significant influence on the soil structure and pore distribution for the remolded sample.
英文关键词	Freezing-thawing deformation; Volumetric unfrozen water content; Matric suction; Freeze-thaw cycle; Silty clay
语种	英语
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
WOS关键词	POWER TRANSMISSION-LINE ; QINGHAI-TIBET PLATEAU ; PERMAFROST REGIONS ; ENGINEERING PROPERTIES ; MECHANICAL-PROPERTIES ; THERMAL-CONDUCTIVITY ; SOIL ; CYCLES ; MODEL ; CONSTRUCTION
WOS记录号	WOS:000432682200003
来源期刊	COLD REGIONS SCIENCE AND TECHNOLOGY
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/240139
作者单位	[Lu, Jianguo; Zhang, Mingyi; Zhang, Xiyin; Pei, Wansheng] Chinese Acad Sci, State Key Lab Frozen Soil Engn, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Gansu, Peoples R China; [Lu, Jianguo; Zhang, Mingyi; Pei, Wansheng] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Zhang, Xiyin] Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou 730000, Gansu, Peoples R China; [Bi, Jun] Lanzhou Univ, Sch Civil Engn & Mech, Lanzhou 73000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Lu, Jianguo,Zhang, Mingyi,Zhang, Xiyin,et al. Experimental study on the freezing-thawing deformation of a silty clay[J]. 中国科学院西北生态环境资源研究院,2018,151.
APA	Lu, Jianguo,Zhang, Mingyi,Zhang, Xiyin,Pei, Wansheng,&Bi, Jun.(2018).Experimental study on the freezing-thawing deformation of a silty clay.COLD REGIONS SCIENCE AND TECHNOLOGY,151.
MLA	Lu, Jianguo,et al."Experimental study on the freezing-thawing deformation of a silty clay".COLD REGIONS SCIENCE AND TECHNOLOGY 151(2018).