Back silting and slope stability of foundation trench in Shenzhen-Zhongshan immersed tunnel project

CAO Ying-feng; LI Xing-gao; YANG Yi

doi:10.11779/CJGE202007019

Volume 42 Issue 7

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Chinese Journal of Geotechnical Engineering > 2020 > 42(7): 1350-1358. > DOI: 10.11779/CJGE202007019

CAO Ying-feng, LI Xing-gao, YANG Yi. Back silting and slope stability of foundation trench in Shenzhen-Zhongshan immersed tunnel project[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(7): 1350-1358. DOI: 10.11779/CJGE202007019

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Back silting and slope stability of foundation trench in Shenzhen-Zhongshan immersed tunnel project

CAO Ying-feng^{1, 2,},
LI Xing-gao^{1, 3, ,},
YANG Yi^{1, 3}

1.
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2.
CCCC Highway Consultants Co., Ltd., Beijing 100088, China
3.
Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China

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Received Date: July 19, 2019
Available Online: December 05, 2022

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Abstract

Abstract

Due to the large intensity of back silting and long-term idleness of foundation trench, back silting will threaten the safety of immersed tunnel. Relying on Shenzhen-Zhongshan immersed tunnel project, the change rules of back silting with time and space in the trial trench tests are summarized. A numerical model is established to study the influences of back silting on the stability of foundation trench slope. The factors affecting the local stability of back silting are deeply analyzed. The results show that: (1) The horizontal distribution of back silting is obviously different, that is, the amount of back silting at the bottom, north slope and south slope decreases in turn. The vertical distribution of back silting is uneven, and the thickness of back silting from top to bottom decreases. The amount of back silting varies greatly through out the year, large in flood season but small in dry season. (2) The stability of foundation trench slope is mainly controlled by the back silting, and the stability of back silting can be significantly improved by desilting with slope. The safety factor of back silting decreases with the increase of thickness of back silting, desilting gradient, slope height, slope gradient or the decrease of shear strength of back silting.
- immersed tunnel,
- foundation trench,
- back silting,
- stability,
- trial trench

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References (21)

References

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