Uneven settlement characteristics and influence factors of metro elevated structures in soft soil region

WU Nan; XIAO Jun-hua

Volume 17 Issue 2

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WU Nan, XIAO Jun-hua. Uneven settlement characteristics and influence factors of metro elevated structures in soft soil region[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 12-20.

Citation:

WU Nan, XIAO Jun-hua. Uneven settlement characteristics and influence factors of metro elevated structures in soft soil region[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 12-20.

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Uneven settlement characteristics and influence factors of metro elevated structures in soft soil region

WU Nan^{1, 2
,},
XIAO Jun-hua³

1.
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2.
Kunshan Rail Transit Investment and Development Co., Ltd., Kunshan 215332, Jiangsu, China
3.
Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China

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Author Bio:
WU Nan(1981-), male, senior engineer, PhD, +86-512-57699166, 813778766@qq.com
Received Date: 2016-12-05
Publish Date: 2017-04-25

Abstract

Abstract

In order to study the uneven settlement characteristics of elevated structures of a metro line in soft soil region, a long-term settlement observation was carried out during construction period and operation period, and the observed objects included elevated stations, elevated intervals with prestressed concrete simply supported beam bridges and large-span prestressed continuous bridges.The uneven settlement characteristics of piers and track beds of elevated substructures and their influence factors were investigated, and the settlement development rules during operation period and construction period were compared.Analysis result shows that after 2 years of operation, the maximum settlement of piers is 12.4 mm with relative to the beginning settlement of operation, and there is still a trend of continuous development.Six settlementtroughs are observed on the studied metro line because of the activities of construction engineering around the metro line.Totally, the differential settlements of adjacent piers are less than 2 mm.The settlement of elevated station mainly generates during construction period, the maximum accumulative settlement is about 17.5 mm at the moment, and the total maximum accumulative settlement only is 18.8 mm during both construction period and operation period.The differential settlements of bridge piers in elevated intervals are unconspicuous during both construction period and operation period, the maximum accumulative settlement during construction period is 14.2 mm, and the total maximum accumulative settlement is 23.9 mm during both construction period and operation period.Most of ballast bed slabs on simple support beam bridge in elevated intervals have upward deformations, and the maximum deformation is 8.9 mm.While the ballast bed slabs on the main spans of large-span continuous beam bridge have large deflections, and the maximum deformation is 29.2 mm.
- soft soil region,
- metro viaduct,
- pier,
- ballast bed,
- differential settlement

BAI Bing(1966-), male, professor, PhD, +86-10-51684815, baibing66@263.net

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References(25)

References

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