Prediction of surface displacement caused by shield construction in soil-rock composite strata

QI Yongjie; ZHU Jiancai; ZHOU Jian; ZHOU Sijian; LI Dongtai; WEI Gang

doi:10.11779/CJGE20220318

Volume 45 Issue 5

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Chinese Journal of Geotechnical Engineering > 2023 > 45(5): 1054-1062. > DOI: 10.11779/CJGE20220318

QI Yongjie, ZHU Jiancai, ZHOU Jian, ZHOU Sijian, LI Dongtai, WEI Gang. Prediction of surface displacement caused by shield construction in soil-rock composite strata[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(5): 1054-1062. DOI: 10.11779/CJGE20220318

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Prediction of surface displacement caused by shield construction in soil-rock composite strata

QI Yongjie^{1, 3,},
ZHU Jiancai^{2, 4},
ZHOU Jian^{1, 3, ,},
ZHOU Sijian^{1, 3},
LI Dongtai⁵,
WEI Gang^{6, 7, 8}

1.
Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2.
Center for Balance Architecture, Zhejiang University, Hangzhou 310012, China
3.
Engineering Research Center of Urban Underground Development of Zhejiang Province, Zhejiang University, Hangzhou 310058, China
4.
Architectural Design and Research Institute of Zhejiang University, Hangzhou 310012, China
5.
China Railway Tunnel Stock Co., Ltd., Zhengzhou 450001, China
6.
Department of Civil Engineering, Hangzhou City University, Hangzhou, Zhejiang 310015, China
7.
Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou 310015, China
8.
Zhejiang Engineering Research Center of Intelligent Urban Infrastructure, Hangzhou 310015, China

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Received Date: March 21, 2022
Available Online: May 18, 2023

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Abstract

Abstract

When the shield tunnel passes through the soil-rock composite strata, it is easy to cause surface subsidence. In order to explore its law, the convergence mode of shield excavation face in a composite stratum is analyzed. The influences of layered strata on the surface displacement are considered. The traditional stochastic medium theory is simplified. The formula for calculating the surface displacement caused by shield construction in the composite stratum is deduced. Relying on the shield tunnel project of Huancheng North Road-Tianmushan Road in Hangzhou, the calculation and reliability verification of the surface subsidence are carried out. A total of 26 groups of measured data of surface settlement in China are collected and analyzed. The corresponding soil loss ratios are obtained through the inverse analysis, and the distribution and value laws of the soil loss ratios are further analyzed. The results show that the values by the simplified method is similar to those of the traditional stochastic medium theory, and the calculated curves are consistent with the measured data. The soil loss ratios in the composite stratum are distributed between 0.09% and 2.2%, which is similar to that in the cohesive soil. In the same project (section), the soil loss ratios decrease with the increase of the hard rock ratio and are roughly linearly correlated.
- shield tunnel,
- soil-rock composite stratum,
- layered stratum,
- surface subsidence,
- soil loss ratio

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Prediction of surface displacement caused by shield construction in soil-rock composite strata

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