Longitudinal equivalent torsional stiffness and torsional performance of shield tunnel

被引：0
|
作者：
Liu Y. [1 ]
Liao S. [1 ]
Liu M. [1 ]
Chen L. [2 ]
Xu W. [2 ]
Hua J. [2 ]
Liu H. [3 ]
机构：
[1] Department of Geotechnical Engineering, Tongji University, Shanghai
[2] Shanghai Urban Construction Municipal Engineering Co. Ltd., Shanghai
[3] Jinan Rail Transit Group Co. Ltd., Jinan
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 06期
基金：
中国国家自然科学基金;
关键词：
equivalent continuous model; longitudinal torsional stiffness; shield tunneling; torsional performance; uneven cross-section torsion;
D O I：
10.11817/j.issn.1672-7207.2023.06.013
中图分类号：
学科分类号：
摘要：
Shield tunnel which is subjected to the asymmetric loading inevitably suffers from uneven longitudinal cross-section torsion due to its segmental nature. The uneven cross-section torsion causes additional stress and deformation in segment and bolts and further induces the misalignment of circumferential joints, which is harmful to the safety of tunnels. However, the effect of longitudinal cross-section torsion on segmental tunnel has not received enough attention. In order to study the longitudinal torsional performance of shield tunnel, firstly, the longitudinal torsional stiffness of the shield tunnel subjected to different stress combinations is deduced based on the equivalent continuous model and force balance equation. Secondly, the validity of the analytical solution was verified by comparing it with the finite element results. Finally, the effects of thickness to diameter ratio, width to diameter ratio, shear length of bolt, longitudinal axial force and bending moment of tunnel on torsional stiffness were investigated. Besides, the envelope curve of tunnel active-torsion-rejection critical load(N0, M0) was given. The results show that the longitudinal torsional stiffness efficiency(LTSE) of shield tunnel decreases with the increase of segment thickness to diameter ratio, but increases with the increase of segment ring width to diameter ratio. The LTSE decreases with the increase of the effective shear length of the bolt. Besides, the variation of the effective shear length of bolts leads to the change of torsional deformation of the circumferential joint, but it does not change the location of the neutral axis and torsional center. The LTSE increases with the increase of the ratio of compression-torsion or bending-torsion. Thus, it is vital to set reasonable compression-torsion and bending-torsion ratios in tunnel anti-torsion design. It is suggested that bolts with preload or prestressed segments should be regarded as effective measures to improve the torsional performance of shield tunnel. © 2023 Central South University of Technology. All rights reserved.
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页码：2220 / 2232
页数：12
相关论文
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