Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of Existing Tunnel on the Evolution of Soil Arching Effect
In this study, a series of trapdoor tests were conducted in sand in an existing circular tunnel. Digital image correlation (DIC) was used to visualize the displacement and shear information of the sand. The effect of the backfill burial depth was considered. The results showed that the same load–displacement curve characteristics can be obtained with four stages (initial arching, maximum arching, load recovery, and ultimate stages), whether an existing tunnel is present or not. The ultimate soil arching ratio is degraded in ground with a tunnel, and most evident with H/B = 4.0, compared to the results without structures. The shadowing effect of existing tunnels is significant. A shield region was generated above the existing tunnel. The shear band gradually expanded from the inside to the outside as the trapdoor slid downward. New shear bands formed at the tunnel shoulder when the shear band exceeded the trapdoor width range. Two deformation patterns, parallel flow over a tunnel and cross-flow over a tunnel, were identified based on development of shear bands in the sand within the existing tunnel.
Effect of Existing Tunnel on the Evolution of Soil Arching Effect
In this study, a series of trapdoor tests were conducted in sand in an existing circular tunnel. Digital image correlation (DIC) was used to visualize the displacement and shear information of the sand. The effect of the backfill burial depth was considered. The results showed that the same load–displacement curve characteristics can be obtained with four stages (initial arching, maximum arching, load recovery, and ultimate stages), whether an existing tunnel is present or not. The ultimate soil arching ratio is degraded in ground with a tunnel, and most evident with H/B = 4.0, compared to the results without structures. The shadowing effect of existing tunnels is significant. A shield region was generated above the existing tunnel. The shear band gradually expanded from the inside to the outside as the trapdoor slid downward. New shear bands formed at the tunnel shoulder when the shear band exceeded the trapdoor width range. Two deformation patterns, parallel flow over a tunnel and cross-flow over a tunnel, were identified based on development of shear bands in the sand within the existing tunnel.
Effect of Existing Tunnel on the Evolution of Soil Arching Effect
Lecture Notes in Civil Engineering
Wu, Wei (Herausgeber:in) / Leung, Chun Fai (Herausgeber:in) / Zhou, Yingxin (Herausgeber:in) / Li, Xiaozhao (Herausgeber:in) / Zhang, Ruixiao (Autor:in) / Su, Dong (Autor:in) / Lin, Xingtao (Autor:in) / Chen, Xiangsheng (Autor:in)
Conference of the Associated research Centers for the Urban Underground Space ; 2023 ; Boulevard, Singapore
Proceedings of the 18th Conference of the Associated Research Centers for the Urban Underground Space ; Kapitel: 164 ; 1213-1215
10.07.2024
3 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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