Study of Longitudinal Deformation of Existing Underlying Tunnel due to Above Excavation Considering Shear Deformation of Tunnel

被引：0
|
作者：
Feng G. [1 ,2 ,3 ]
Xu C. [1 ,3 ,4 ,5 ]
Zheng M. [1 ]
Xue W. [6 ]
Yang K. [1 ]
Guan L. [3 ,4 ]
机构：
[1] Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou
[2] Center for Balance Architecture, Zhejiang University, Hangzhou
[3] Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, East China Jiaotong University, Nanchang
[4] Engineering Research & Development Centre for Underground Technology of Jiangxi Province, Nanchang
[5] State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang
[6] Zhejiang Communications Investment Group Co., Ltd, Hangzhou
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2022年 / 44卷 / 03期
关键词：
Analytical solution; Existing tunnel; Foundation pit excavation; Kerr foundation model; Timoshenko beam;
D O I：
10.3969/j.issn.1001-8360.2022.03.009
中图分类号：
学科分类号：
摘要：
The soil unloading caused by excavation of foundation pit will cause deformation of existing tunnel underneath, even cracking and fracture of existing tunnel segment. To simplify the tunnel into Timoshenko beam in this study, which can consider both the longitudinal stiffness and shear deformation, the three-parameter Kerr foundation model should be selected as the foundation model. The analytical longitudinal deformation of the tunnel can be solved by using the finite difference method, considering the boundary conditions at the ends of the tunnel. Through comparing with the finite element simulation method, the existing foundation model theory and some case studies, the rationality of the proposed method was proved. The research shows that compared with the tunnel simplified as Timoshenko beam on the existing Winkler and Pasternak foundation model, the Kerr foundation model has more advantages. Compared with the calculation results of the degradable Pasternak foundation model, the Kerr foundation model is more agree with the engineering practice. The increase of the excavation width and depth of the foundation pit will increase the longitudinal deflection and bending moment of the tunnel. On the contrary, the longitudinal deflection and bending moment of the tunnel will decrease with the increase of the elastic modulus of soil mass, the depth of tunnel axis and the distance between tunnel axis and the foundation pit center. © Year, Department of Journal of the China Railway Society. All right reserved.
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页码：132 / 141
页数：9
相关论文
共 23 条
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