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	An investigation of pore water pressure and consolidation phenomenon in the unfrozen zone during soil freezing
	Zhang, Lianhai1,2; Ma, Wei1; Yang, Chengsong1; Wen, Zhi1; Dong, Sheng3
刊名	Cold regions science and technology
	2016-10-01
卷号	130页码:21-32
关键词	Pore water pressure Vacuum-induced consolidation Frost heaving stress Water expulsion The unfrozen zone Frost heave
ISSN号	0165-232X
DOI	10.1016/j.coldregions.2016.07.007
通讯作者	Ma, wei(mawei@lzb.ac.cn)
英文摘要	Accurate modeling of soil deformation depends on the consideration of both frost heave deformation in the frozen zone and consolidation deformation in the unfrozen zone. pore water pressure investigations are important for revealing these two deformation behaviors. herein, we aim to reveal the consolidation process by measuring and analyzing changes in pore water pressure in the unfrozen zone. using a custom-made pore water pressure gauge, we performed a series of real-time pore water pressure measurements in the unfrozen zone of silty clay and sandy soil samples that were exposed to closed and open freezing systems. the results show that the pore water pressure in the unfrozen zone generally increases at first and then decreases. the temperature changes in the unfrozen zone have no significant influence on the changes in pore water pressure, and the variations of the pore water pressure are mainly controlled by the stress and hydraulic boundary (changes in pore water pressure) conditions at the freezing front. furthermore, changes in the pore water pressure are affected by several parameters, including soil type, water supply condition, initial moisture content, measured soil layer depth, and hydraulic conductivity. soil consolidation is mainly caused by change in effective stress, which results from increase in total stress or decrease in pore pressure. based on the observed pore water pressure variations and its numerical simulations, we propose that consolidation in the unfrozen zone during soil freezing includes compression-induced consolidation, which results from an increase in frost heaving stress, and vacuum induced consolidation, which results from a decrease in pore water pressure. each consolidation pattern plays an important role in the different stages of soil freezing. compression-induced consolidation primarily occurs during the early stage of soil freezing, while vacuum-induced consolidation mainly occurs during the later stage of soil freezing. (c) 2016 elsevier b.v. all rights reserved.
WOS关键词	PARTIALLY FROZEN SOIL ; FINE-GRAINED SOILS ; FROST HEAVE ; POROUS-MEDIA ; ICE ; VACUUM ; MODEL ; EXPULSION ; PHYSICS
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:000383300400003
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2376295
专题	中国科学院大学
通讯作者	Ma, Wei
作者单位	1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Beijing Univ Technol, Coll Civil Engn, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Lianhai,Ma, Wei,Yang, Chengsong,et al. An investigation of pore water pressure and consolidation phenomenon in the unfrozen zone during soil freezing[J]. Cold regions science and technology,2016,130:21-32.
APA	Zhang, Lianhai,Ma, Wei,Yang, Chengsong,Wen, Zhi,&Dong, Sheng.(2016).An investigation of pore water pressure and consolidation phenomenon in the unfrozen zone during soil freezing.Cold regions science and technology,130,21-32.
MLA	Zhang, Lianhai,et al."An investigation of pore water pressure and consolidation phenomenon in the unfrozen zone during soil freezing".Cold regions science and technology 130(2016):21-32.

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