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	Causes of pile foundation failure in permafrost regions: The case study of a dry bridge of the Qinghai-Tibet Railway
	You, Yanhui1; Wang, Jinchang2; Wu, Qingbai1; Yu, Qihao1; Pan, Xicai3; Wang, Xinbin1; Guo, Lei1
刊名	ENGINEERING GEOLOGY
	2017-11-29
卷号	230页码:95-103
关键词	Pile foundations Permafrost degradation Sub-permafrost groundwater Pile settlement Geophysical investigation
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2017.10.004
通讯作者	Yu, Qihao(yuqh@lzb.ac.cn)
英文摘要	Pile foundations are widely used to support dry bridges crossing large extents of warm and ice-rich permafrost zones along the Qinghai-Tibet Railway (QTR). The performance of these pile foundations are related to permafrost conditions surrounding the piles. However, the impacts of permafrost degradation on the stability of pile foundations have been rarely investigated. In this study, permafrost degradation has been assegsed around several pile foundations in the Tanggula Mountain area along the QTR 15 years after the first field investigation in 2001 for the construction of the QTR. This assessment is mainly based on drilling, geophysical surveys, and monitoring of the settlements affecting the pile foundations. The permafrost in contact with the piles has significantly thinned after the piles were casted-in-place and put into service about 8 years ago. Moreover, the thickness of residual permafrost is less than the embedment length for some piles and, therefore, the adfreeze bond between the piles and permafrost has significantly decreased. In addition, artesian sub-permafrost groundwater has been observed around the middle-lower and below the piles. Due to this sub-permafrost aquifer, the end bearing capacity of the piles and the friction between the piles and thawed soils have also probably decreased. The applied load on the piles is now supported by the residual permafrost resulting in large settlements of the piles. The thaw consolidation and settlement of degrading permafrost have also potentially contributed to the total settlement. According to the investigation presented herein, the occurrence of sub permafrost aquifer which was induced by permafrost degradation is the primary cause of pile settlements. The failure mechanisms of the piles as revealed by this assessment are useful for the design and maintenance of piles in warm and ice-rich permafrost regions. Moreover, the use of geophysical methods for investigating pile foundation failure due to permafrost degradation has proved effective.
收录类别	SCI
WOS关键词	ROADBED COOLING APPROACH ; GOLMUD-LHASA RAILWAY ; ACTIVE LAYER ; CHINA ; EMBANKMENT ; PLATEAU ; DEGRADATION ; FEATURES ; DESIGN
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Geological ; Geosciences, Multidisciplinary
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000417660000010
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558045
专题	寒区旱区环境与工程研究所
通讯作者	Yu, Qihao
作者单位	1.Chinese Acad Sci, State Key Lab Frozen Soils Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou, Gansu, Peoples R China 2.Qinghai Tibet Railway Co, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	You, Yanhui,Wang, Jinchang,Wu, Qingbai,et al. Causes of pile foundation failure in permafrost regions: The case study of a dry bridge of the Qinghai-Tibet Railway[J]. ENGINEERING GEOLOGY,2017,230:95-103.
APA	You, Yanhui.,Wang, Jinchang.,Wu, Qingbai.,Yu, Qihao.,Pan, Xicai.,...&Guo, Lei.(2017).Causes of pile foundation failure in permafrost regions: The case study of a dry bridge of the Qinghai-Tibet Railway.ENGINEERING GEOLOGY,230,95-103.
MLA	You, Yanhui,et al."Causes of pile foundation failure in permafrost regions: The case study of a dry bridge of the Qinghai-Tibet Railway".ENGINEERING GEOLOGY 230(2017):95-103.

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