Influence of freeze-thaw cycles in the presence of a supplementary water supply on mechanical properties of compacted soil

doi:10.1016/j.coldregions.2018.09.009

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	Influence of freeze-thaw cycles in the presence of a supplementary water supply on mechanical properties of compacted soil
	Lu, Zheng ; Xian, Shaohua ; Yao, Hailin ; Fang, Ran ; She, Jianbo
	2019
发表期刊	COLD REGIONS SCIENCE AND TECHNOLOGY
ISSN	0165-232X
卷号	157 期号:-页码:42-52
摘要	In seasonal frozen regions where the groundwater is relatively shallow, the upward migration of groundwater during the freezing process will change the moisture content of the subgrade soil after freeze-thaw (F-T) cycles. This study attempted to investigate the deterioration effect of F-T cycles in combination with available groundwater migration on the mechanical properties of compacted clayey soil. For this purpose, the compacted clay specimens were frozen and thawed from the top to bottom and external water was supplied from the bottom of the samples. Specimens with different initial states (i.e. different initial dry densities and initial moisture contents) were subjected to different number of F-T cycles. The changes in moisture content and frost heave after the F-T cycles were measured. The failure strength and elastic modulus of the soil then were determined using unconsolidated and undrained triaxial compression tests. The results of the study demonstrated that water replenishment of the soil during the freezing process had considerable influence on the mechanical properties of soil, and the availability of a supplementary water supply could accelerate the development of stable state in the failure strength and the elastic modulus of soil. Moreover, the reduction rates of failure strength and elastic modulus reached 85% and 92% after 7 F-T cycles, respectively. The degradation effect of the F-T cycles on the mechanical property of soil can be reduced by enhancing the dry density or by moderately raising the moisture content of soil. Finally, the fitted models describing the combining effects of F-T cycles, initial dry density, initial moisture content and confining pressure on the failure strength and elastic modulus of soil were developed and verified by the experimental data to be rational and reliable.
关键词	Freeze-thaw cycles Water supply Mechanical properties Triaxial test Compacted soil
DOI	10.1016/j.coldregions.2018.09.009
收录类别	SCI
语种	英语
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
WOS记录号	WOS:000451428000005
引用统计	被引频次：36[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.198/handle/2S6PX9GI/15099
专题	岩土力学所知识全产出_期刊论文国家重点实验室知识产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Lu, Zheng,Xian, Shaohua,Yao, Hailin,et al. Influence of freeze-thaw cycles in the presence of a supplementary water supply on mechanical properties of compacted soil[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2019,157(-):42-52.
APA	Lu, Zheng,Xian, Shaohua,Yao, Hailin,Fang, Ran,&She, Jianbo.(2019).Influence of freeze-thaw cycles in the presence of a supplementary water supply on mechanical properties of compacted soil.COLD REGIONS SCIENCE AND TECHNOLOGY,157(-),42-52.
MLA	Lu, Zheng,et al."Influence of freeze-thaw cycles in the presence of a supplementary water supply on mechanical properties of compacted soil".COLD REGIONS SCIENCE AND TECHNOLOGY 157.-(2019):42-52.

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