Research on longitudinal deformation characteristics of shield tunnel segment under water level change

Yu-chen Hu; Peng-fei Cao; Da-xin Geng; Ya-long Jiang; Xiao-long Guo; Ming Wan

doi:10.1117/12.2613747

10 November 2021 Research on longitudinal deformation characteristics of shield tunnel segment under water level change

Yu-chen Hu, Peng-fei Cao, Da-xin Geng, Ya-long Jiang, Xiao-long Guo, Ming Wan

Proceedings Volume 12050, International Conference on Smart Transportation and City Engineering 2021; 1205045 (2021) https://doi.org/10.1117/12.2613747
Event: 2021 International Conference on Smart Transportation and City Engineering, 2021, Chongqing, China

Abstract

The water level difference between the dry season and the flood season of Ganjiang River is more than 10 meters. If the water level changes too much, it will have a great impact on the safety of the tunnel under the river. Relying on the construction project of Nanchang rail transit line 4 crossing Ganjiang River, the longitudinal deformation characteristics of tunnel segments under the water level change are studied. Firstly, with the help of surface mounted concrete strain gauge, the longitudinal strains at the inner arch bottom, arch waist and arch crown of the segment were measured. Then, ABAQUS software was used for modeling to obtain the longitudinal stress distribution of the tunnel segment. Finally, the numerical simulation results were compared with the field monitoring results, the main conclusions are as follows: (1) the change of water level has a regular effect on the longitudinal deformation of shield tunnel segment. With the decrease of water level, the arch bottom and arch crown are compressed, while the arch waist is tensioned; (2) The change of water level has the greatest influence on the strain of segment vault region, and the smallest influence on the strain of segment bottom region.

Citation Download Citation

Yu-chen Hu, Peng-fei Cao, Da-xin Geng, Ya-long Jiang, Xiao-long Guo, and Ming Wan "Research on longitudinal deformation characteristics of shield tunnel segment under water level change", Proc. SPIE 12050, International Conference on Smart Transportation and City Engineering 2021, 1205045 (10 November 2021); https://doi.org/10.1117/12.2613747

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KEYWORDS

Numerical simulations

Temperature metrology

Civil engineering

Safety

3D modeling

Analytical research

Image segmentation

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