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DOI	10.1007/s40999-022-00702-7
	Effects of Freeze-Thaw Cycles on the Mechanical Properties of the Core-Wall Contact Clay of a Dam
	Yu, Yanyang; Liu, Enlong; Yu, Qihao; Zhang, Guike; Ye, Xia
通讯作者	Liu, EL (通讯作者)，Sichuan Univ, Coll Water Resources & Hydropower, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Peoples R China. ; Liu, EL (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	2020
ISSN	1735-0522
EISSN	2383-3874
英文摘要	In cold regions at high altitudes, freeze-thaw cycles due to diurnal temperature variation in the construction process in winter result in the core-wall soil materials of dams having varying mechanical properties. In this study, a series of consolidated undrained triaxial tests were performed on soil samples subjected to various numbers of freeze-thaw cycles to study the effects of freezing and thawing on the mechanical behaviors of contact clay. First, the samples were prepared with a dry density of 1.81 g/cm(3) and a moisture content of 16.8%, which was consistent with that in the in-site construction. The soil samples were subjected to freezing and thawing tests under supplementary water conditions. The freezing and thawing times were 0, 1, 3, and 5, respectively. Finally, consolidated undrained triaxial tests were conducted on the samples, and four levels of confining pressures were applied (50, 100, 200, and 400 kPa). The experimental results indicated that freezing and thawing significantly weakened the mechanical properties of contact clay. The modulus, strength, and internal friction angle decreased considerably with the increase in freeze-thaw cycles, particularly in the first three freeze-thaw cycles. After approximately five freeze-thaw cycles, these three parameters tended to stabilize. The cohesion decreased almost linearly as the number of freeze-thaw cycles increased. In addition, the double hardening constitutive model was employed to model the test results, in which the influence of freeze-thaw cycles was considered by varying the model parameters, and the evolution law of the yield surface with the freeze-thaw cycles was analyzed. A comparison between the test and computed results indicated that the deviatoric stress and pore pressure agreed relatively well.
关键词	BEHAVIOR STRENGTH FROZEN LOESS
英文关键词	Freeze-thaw cycles; Core-wall contact clay; Mechanical properties; Constitutive model
语种	英语
WOS研究方向	Engineering
WOS类目	Engineering, Civil
WOS记录号	WOS:000753222900002
来源期刊	INTERNATIONAL JOURNAL OF CIVIL ENGINEERING
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/253921
作者单位	[Yu, Yanyang; Liu, Enlong; Ye, Xia] Sichuan Univ, Coll Water Resources & Hydropower, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Peoples R China; [Liu, Enlong; Yu, Qihao] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; [Zhang, Guike] Yalong River Hydropower Dev Co Ltd, Chengdu 610065, Peoples R China
推荐引用方式 GB/T 7714	Yu, Yanyang,Liu, Enlong,Yu, Qihao,et al. Effects of Freeze-Thaw Cycles on the Mechanical Properties of the Core-Wall Contact Clay of a Dam[J]. 中国科学院西北生态环境资源研究院,2020.
APA	Yu, Yanyang,Liu, Enlong,Yu, Qihao,Zhang, Guike,&Ye, Xia.(2020).Effects of Freeze-Thaw Cycles on the Mechanical Properties of the Core-Wall Contact Clay of a Dam.INTERNATIONAL JOURNAL OF CIVIL ENGINEERING.
MLA	Yu, Yanyang,et al."Effects of Freeze-Thaw Cycles on the Mechanical Properties of the Core-Wall Contact Clay of a Dam".INTERNATIONAL JOURNAL OF CIVIL ENGINEERING (2020).