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Seismic Response of a Ground-Penetrating Ultra-Shallow Embedded Shield Tunnel: Shaking Table Test
The dynamic responses of ultra-shallow embedded tunnels, such as ground-penetrating shield tunnels (GPST), differ significantly from conventional shield tunnels. The GPST is partially exposed on the surface and partially buried underground. To investigate their characteristics under dynamic motion, large-scale shaking table tests were performed. The model was designed to emulate both the cross-sectional and longitudinal stiffness of prototype tunnels, as well as the site parameters. Simple harmonics with varying significant frequencies were utilized as earthquake motions to excite the tunnel model in both transverse and longitudinal directions. Key aspects studied include the acceleration response and diameter deformation rate to uncover the dynamic characteristics of GPST. The model tunnel's buried depth ranged from −0.5 D to 0.5 D, with negative burial depth indicating that the tunnel's top is above the ground surface. Results demonstrate a strong correlation between the dynamic response and buried depth. Concerning acceleration response, it was found that the acceleration response increases as the buried depth decreases. Specifically, the tunnel's acceleration at the shallowest depth reached four times the input motion. Additionally, the structure exhibited a “whiplash effect,” causing violent oscillations in the overground structure. Conversely, the diameter deformation response indicated that the diameter deformation response increased as the burial depth increased.
Seismic Response of a Ground-Penetrating Ultra-Shallow Embedded Shield Tunnel: Shaking Table Test
The dynamic responses of ultra-shallow embedded tunnels, such as ground-penetrating shield tunnels (GPST), differ significantly from conventional shield tunnels. The GPST is partially exposed on the surface and partially buried underground. To investigate their characteristics under dynamic motion, large-scale shaking table tests were performed. The model was designed to emulate both the cross-sectional and longitudinal stiffness of prototype tunnels, as well as the site parameters. Simple harmonics with varying significant frequencies were utilized as earthquake motions to excite the tunnel model in both transverse and longitudinal directions. Key aspects studied include the acceleration response and diameter deformation rate to uncover the dynamic characteristics of GPST. The model tunnel's buried depth ranged from −0.5 D to 0.5 D, with negative burial depth indicating that the tunnel's top is above the ground surface. Results demonstrate a strong correlation between the dynamic response and buried depth. Concerning acceleration response, it was found that the acceleration response increases as the buried depth decreases. Specifically, the tunnel's acceleration at the shallowest depth reached four times the input motion. Additionally, the structure exhibited a “whiplash effect,” causing violent oscillations in the overground structure. Conversely, the diameter deformation response indicated that the diameter deformation response increased as the burial depth increased.
Seismic Response of a Ground-Penetrating Ultra-Shallow Embedded Shield Tunnel: Shaking Table Test
Lecture Notes in Civil Engineering
Wu, Wei (editor) / Leung, Chun Fai (editor) / Zhou, Yingxin (editor) / Li, Xiaozhao (editor) / Wang, Qi (author) / Yuan, Yong (author)
Conference of the Associated research Centers for the Urban Underground Space ; 2023 ; Boulevard, Singapore
2024-07-10
6 pages
Article/Chapter (Book)
Electronic Resource
English
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