Longitudinal Stiffness Calculation of Metro Shield Tunnel Based on Bolt Tensile Stiffness

被引：0
|
作者：
Huang, Dawei [1 ,2 ]
Jiang, Hao [1 ,2 ]
Feng, Kun [3 ]
Ding, Zhi [4 ]
Cai, Guoqing [1 ,2 ]
Jin, Hao [5 ]
机构：
[1] State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Jiangxi, Nanchang,330013, China
[2] Jiangxi Provincial Key Laboratory of Disaster Prevention and Emergency Management, East China Jiaotong University, Jiangxi, Nanchang,330013, China
[3] Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Sichuan, Chengdu,610031, China
[4] Department of Civil Engineering, Hangzhou City University, Zhejiang, Hangzhou,310015, China
[5] School of Transportation, Southeast University, Jiangsu, Nanjing,211189, China
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2024年 / 45卷 / 04期
关键词：
In view of the deficiency that the existing calculation method for longitudinal stiffness of shield tunnel was lack of experimental verification and did not consider the influence of factors such as bolt tensile stiffness; the analytical calculation method for longitudinal stiffness of shield tunnel was deduced theoretically at first. Then; taking the shield tunnel of Shanghai Metro as the background; a scale model test was designed and carried out; and the analytical calculation method was verified by the measured results. Finally; the longitudinal stiffness of this type of shield tunnel was calculated based on the project background of the shield tunnel in the Pearl River Delta region. The results show that due to the existence of bolt preload; the longitudinal stiffness of the measured tunnel is larger when the mid-span loading is small; but with the increase of the midspan loading; the measured results tend to be close to the theoretical calculation results; which verifies the rationality of the analytical calculation method. The tensile stiffness of longitudinal bolts of shield tunnels in the Pearl River Delta region in the elastic stage; plastic stage and plastic deformation stage is 2. 125 5 × 106; 0; 985; 9; ×; 106; and; 3; 185; 6; N·m－1; respectively; while the longitudinal stiffness is 3. 306 8 × 108; 1; 534; 5; 108; 4; 954; N·m2; respectively. Considering that there are differences in the deformation stages of the longitudinal bolts in a certain range when the longitudinal deformation of the metro shield tunnel occurs; the actual value of longitudinal stiffness should be determined according to the longitudinal bolt tension amount caused by the maximum deformation of the tunnel. © 2024 Chinese Academy of Railway Sciences. All rights reserved;
D O I：
10.3969/j.issn.1001-4632.2024.04.10
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页码：89 / 98
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