Influence of reinforcement range on ground settlement of shallow-buried super-large-diameter shield tunneling in soft soils

HUANG Chang-fu; LONG Wen; SONG Qi-long; LI Dong; SU Dong; CHEN Xiang-sheng

doi:10.11779/CJGE2021S2018

Volume 43 Issue S2

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Chinese Journal of Geotechnical Engineering > 2021 > 43(S2): 76-79. > DOI: 10.11779/CJGE2021S2018

HUANG Chang-fu, LONG Wen, SONG Qi-long, LI Dong, SU Dong, CHEN Xiang-sheng. Influence of reinforcement range on ground settlement of shallow-buried super-large-diameter shield tunneling in soft soils[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(S2): 76-79. DOI: 10.11779/CJGE2021S2018

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Influence of reinforcement range on ground settlement of shallow-buried super-large-diameter shield tunneling in soft soils

1.
China Railway 15 Bureau Group CO., Ltd., Shanghai 201306, China
2.
Zhuhai Da Hengqin City New Center Development Co., Ltd., Zhuhai 519030, China
3.
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
4.
Zhuhai Institute of Urban Planning & Design, Zhuhai 519000, China
5.
Key Laboratory for Resilient Infrastructures of Coastal Cities (MOE), Shenzhen University, Shenzhen 518060, China

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Received Date: August 17, 2021
Available Online: December 05, 2022

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Abstract

Abstract

The shield method is the main construction method for the excavation of underground tunnels in soft soil areas, but the impact of shallow-buried super-large-diameter shield tunneling in soft soils on ground settlement needs to be further studied. Based on the case of Weizhou Tunnel in Hengqin of Zhuhai the influence of the reinforcement range on the surface settlement of shallow-buried super-large diameter shield tunneling in soft soils is studied by using the finite element software. The results show that when t=0.00D, the maximum surface settlement is about 50 mm, when t=0.20D, the maximum surface settlement is about 8 mm, which is about 84% less than the maximum settlement at t=0.00D%, and the soft soil layer can effectively reduce the impact of tunnel excavation on surface settlement after reinforcement. Meanwhile, the law of lateral surface settlement changes during the different construction stages of shield tunnels is analyzed, and the shield tunneling machine disturbs the ground surface during the monitoring of the cross section. The degree is the largest, and the cumulative subsidence accounts for about 50% to 60%.
- soft soil layer,
- reinforcement range,
- super-large-diameter shield tunnel,
- shallow embedment,
- surface settlement

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