Effect of Segment Ring Opening of Shield Tunnel on Its Longitudinal Bending Rigidity

被引：0
作者：
Huang, Da-Wei [1 ,2 ]
Li, Qing [1 ,2 ]
Cai, Guo-Qing [1 ,2 ]
Jiang, Hao [1 ,2 ]
Luo, Zhong-Rui [1 ,2 ]
机构：
[1] State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Jiangxi, Nanchang
[2] Jiangxi Prov. Key Laboratory of Comprehensive Stereoscopic Traffic Information Perception and Fusion, East China Liaotong University, Jiangxi, Nanchang
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2024年 / 37卷 / 10期
基金：
中国国家自然科学基金;
关键词：
longitudinal rigidity; model experiment; shield tunnel; tunnel engineering; tunnel opening;
D O I：
10.19721/j.cnki.1001-7372.2024.10.015
中图分类号：
学科分类号：
摘要：
After the completion of the shield tunnel, owing to certain functional requirements, opening at different positions of the shield tunnel, such as the construction of the channel connecting the two parallel shield tunnels, the construction of the underground shaft pump room at the bottom of the shield tunnel, and the construction of the shaft at the top of the shield tunnel are necessary. This study sets up three different openings at the same position of the shield tunnel: the top, side, and bottom openings. To resolve the problem caused by the reduction in the longitudinal rigidity of shield tunnel after opening, which is prone to longitudinal uneven settlement or horizontal deflection deformation, a model shield tunnel with a geometric similarity ratio of 1 : 10 was designed, and the influence of openings at different positions of the shield tunnel on its longitudinal rigidity was carried out. The simply supported beam method was used to compare and analyze the measurements of the openings at different positions of the shield tunnel and unopened tunnel. The influence of the opening extent of the annular joint, opening position, and opening at different positions on the longitudinal bending rigidity of the model tunnel were analyzed. The bending rigidity of the tunnel in different directions after opening was tested. The results show that rigidity decreases by 90. 5% when the opening position is compressed, 64. 6% when the opening position is tensioned, and 42. 4% when the bending direction of the tunnel is perpendicular to the opening position. After the opening of the shield tunnel, the bending rigidity of the shield tunnel is reduced owing to the removal of the ring joint connection bolts at the opening. In the bending process of the relatively complete shield tunnel, the corresponding rigidity at different openings plays different roles; therefore, the degree of rigidity reduction of the shield tunnel varies. After the shield tunnel is opened, the bending rigidity of the tunnel is related to its bending direction and the relative position of the opening. In the analysis of the load deformation and seismic analysis of the shield tunnel, the bending rigidity of the shield tunnel should be determined according to the bending direction of the tunnel. © 2024 Chang'an University. All rights reserved.
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页码：162 / 170
页数：8
相关论文
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