Calculation Model for Longitudinal Deformation of Shield Tunnel Considering Soil Shear and Joint Shear Effect

被引：0
|
作者：
Li M. [1 ]
Zhu K. [1 ]
Chen J. [2 ,3 ]
Lin Y. [1 ,4 ]
Wu L. [1 ]
Jin J. [1 ]
Yang X. [5 ]
机构：
[1] School of Civil Engineering, Zhengzhou University, Henan, Zhengzhou
[2] China Railway 14th Bureau Group Corporation Limited, Shandong, Jinan
[3] China Railway Construction Underwater Shield Engineering Laboratory, Shandong, Jinan
[4] Guangzhou Metro Design and Research Institute Co., Ltd., Guangdong, Guangzhou
[5] Wuhan Metro Group Co., Ltd., Hubei, Wuhan
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2024年 / 45卷 / 01期
关键词：
Longitudinal deformation; Pasternak two-parameter foundation model; Shield tunnel; Timoshenko beam;
D O I：
10.3969/j.issn.1001-4632.2024.01.14
中图分类号：
学科分类号：
摘要：
In order to solve the problem of longitudinal non-uniform deformation and stress of shield tunnel under additional external forces in the engineering of immediate shield tunnel or shield tunnel piercing through pile foundation, a new calculation model for longitudinal deformation of shield tunnel is proposed by using a computational analytic method to consider shield tunnel as Timoshenko beam placed on Pasternak two-parameter foundation, and introduce the modified equivalent continuum model and transfer matrix method, which is verified by the method of laboratory model test. The results show that in the model test, under the combined action of concentrated load and confining pressure, during the whole elastic deformation stage of the tunnel, the convergence deformation of each ring segment, the vertical displacement of the arch crown and arch bottom, and the misalignment of the circumferential seam all increase approximately linearly with the increase of concentrated load, and they are distributed symmetrically along the longitudinal direction with the concentrated load as the center, whose deformation trend is the same as the calculation result. With the two methods, the maximum relative error of circumferential seam misalignment is only 8. 75%. The results obtained by two methods are basically consistent in terms of distribution characteristics and magnitude, which verifies the feasibility of the calculation model. The model can reflect the shear action between soil springs, the influence of convergence deformation on longitudinal deformation stiffness of tunnel and discontinuity of joint. It can predict and analyze the longitudinal deformation and internal force of shield tunnel, and provide theoretical guidance for the safety evaluation of the existing shield tunnel in the immediate shield tunnel engineering. © 2024 Chinese Academy of Railway Sciences. All rights reserved.
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页码：142 / 154
页数：12
相关论文
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