Deformation calculation of underlying shield tunnel caused by unloading of foundation pit considering excavation width

被引：0
|
作者：
Wei G. [1 ,2 ]
Guo B. [3 ]
Wang Z. [3 ]
Liu J. [1 ]
机构：
[1] Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou City University, Zhejiang, Hangzhou
[2] Zhejiang Engineering Research Center of Intelligent Urban Infrastructure, Hangzhou City University, Zhejiang, Hangzhou
[3] Institute of Geotechnical Engineering, Zhejiang University of Technology, Zhejiang, Hangzhou
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷 / 04期
关键词：
deformation model; excavation of pit foundation; foundation pit engineering; longitudinal deformation; tunnel; virtual image technique;
D O I：
10.13722/j.cnki.jrme.2022.0508
中图分类号：
学科分类号：
摘要：
To calculate the influence of the uplift deformation of the foundation pit bottom on the longitudinal deformation of the underlying tunnel, the calculation model of foundation pit excavation deformation is established. A cooperative tunnel model of rotation and staggered platform deformation is adopted. Based on the virtual image technique，the formulas of longitudinal deformation of the underlying tunnel caused by the excavation of the foundation pit are derived. Three sets of typical cases were selected for calculation and analysis. The B-W and B-P methods are compared to verify the correctness of the calculation method. Moreover，the influence of four factors，namely the maximum uplift of the pit bottom，the excavation width and depth of the pit and the buried depth of the tunnel are analyzed. The results show that there is a positive correlation between the maximum uplift value of the foundation pit bottom and the maximum uplift value of the underlying tunnel. As the excavation width of the foundation pit increases，the uplift value and uplift range of the tunnel increase accordingly. The buried depth and the uplift value of the underlying tunnel show a nonlinear decreasing law. The longitudinal deformation of the underlying tunnel can be effectively controlled by reducing the uplift deformation of the pit bottom and the pit excavation width along the tunnel axis. © 2023 Academia Sinica. All rights reserved.
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页码：1019 / 1030
页数：11
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