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

被引：0
|
作者：
Qi Y. [1 ,3 ]
Zhu J. [2 ,4 ]
Zhou J. [1 ,3 ]
Zhou S. [1 ,3 ]
Li D. [5 ]
Wei G. [6 ,7 ,8 ]
机构：
[1] Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou
[2] Center for Balance Architecture, Zhejiang University, Hangzhou
[3] Engineering Research Center of Urban Underground Development of Zhejiang Province, Zhejiang University, Hangzhou
[4] Architectural Design, Research Institute of Zhejiang University, Hangzhou
[5] China Railway Tunnel Stock Co., Ltd., Zhengzhou
[6] Department of Civil Engineering, Hangzhou City University, Zhejiang, Hangzhou
[7] Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou
[8] Zhejiang Engineering Research Center of Intelligent Urban Infrastructure, Hangzhou
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2023年 / 45卷 / 05期
关键词：
layered stratum; shield tunnel; soil loss ratio; soil-rock composite stratum; surface subsidence;
D O I：
10.11779/CJGE20220318
中图分类号：
学科分类号：
摘要：
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. © 2023 Chinese Society of Civil Engineering. All rights reserved.
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页码：1054 / 1062
页数：8
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