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	Analysis of tower foundation stability along the Qinghai-Tibet Power Transmission Line and impact of the route on the permafrost
	Yu, Qihao1; Zhang, Zhongqiu2; Wang, Guoshang3; Guo, Lei1; Wang, Xinbin1; Wang, Pengfei2; Bao, Zhenghong2
刊名	COLD REGIONS SCIENCE AND TECHNOLOGY
	2016
卷号	121页码:205-213
关键词	Power transmission line Re-freezing process of foundation soils Foundation displacement Thermosyphon Permafrost
ISSN号	0165-232X
DOI	10.1016/j.coldregions.2015.06.015
通讯作者	Yu, Qihao(yuqh@lzb.ac.cn)
英文摘要	The Qinghai-Tibet Power Transmission Line (QTPTL), crossing about 550 km permafrost regions, was constructed between July 2010 and October 2011. Based on 4 years of field observations since the construction, thermal and displacement performances of tower foundations in permafrost regions along the QTPTL were analyzed. The observational results from 10 monitored towers showed that the re-freezing process of foundation soils of deeply embedded pile foundations largely took 2 to 3 months. While for shallowly-buried footings, it took one to two cold seasons due to the significant thermal impacts of the foundation construction. After the re-freezing, the thermal regimes of foundation soils mainly determined by the thermosyphon cooling and enhanced heat transfer process of the concrete foundation. With the thermosyphon cooling, foundation soils around and under tower foundations cooled significantly and cold bulbs developed under tower foundations. But for shallowly-buried footings without thermosyphon, the maximum thaw near the footings could be as much as 2.0 m greater than that in the natural ground due to enhanced heat transfer process of the concrete footings. Foundation displacement observations at 130 monitored towers showed that the majority of tower foundations suffered subsidence rather than heave during the observational period. The subsidence was considerable in warm, ice-rich permafrost regions. After the tower assembling and line hanging, the subsidence rate of most of tower foundations decreased substantially. Up to the present, all 130 monitored tower foundations had the accumulative subsidence within an allowable range. Experiences and lessons learned from the QTPTL. will be of value for future similar constructions in permafrost regions. (C) 2015 Elsevier B.V. All rights reserved.
收录类别	SCI
WOS关键词	FROZEN SOIL ; MODEL PILES ; REGIONS ; EMBANKMENT
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:000367111400021
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557152
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, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China 2.State Grid Qinghai Elect Power Co, Test Elect Power Res Inst, Xining 810008, Peoples R China 3.Gansu Elect Power Design Inst, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Yu, Qihao,Zhang, Zhongqiu,Wang, Guoshang,et al. Analysis of tower foundation stability along the Qinghai-Tibet Power Transmission Line and impact of the route on the permafrost[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2016,121:205-213.
APA	Yu, Qihao.,Zhang, Zhongqiu.,Wang, Guoshang.,Guo, Lei.,Wang, Xinbin.,...&Bao, Zhenghong.(2016).Analysis of tower foundation stability along the Qinghai-Tibet Power Transmission Line and impact of the route on the permafrost.COLD REGIONS SCIENCE AND TECHNOLOGY,121,205-213.
MLA	Yu, Qihao,et al."Analysis of tower foundation stability along the Qinghai-Tibet Power Transmission Line and impact of the route on the permafrost".COLD REGIONS SCIENCE AND TECHNOLOGY 121(2016):205-213.

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