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- Title
Three-dimensional hydro-mechanical coupling numerical simulation of shield-driven cross-river twin tunnels: A case study.
- Authors
Chengwen Wang; Xiaoli Liu; Danqing Song; Enzhi Wang; Guohui Yan; Ran Zhou
- Abstract
With the rapid development of urban underground space, the construction of shield-driven cross-river twin tunnels is increasing, and the complex hydro-mechanical coupling effects and twin-tunnel interactions bring huge construction risks to such projects, which have attracted more and more attention. This study aims to understand the excavation effects induced by shield driving of cross-river twin tunnels through numerical simulation. A refined three-dimensional numerical model based on the fully coupled hydro-mechanical theory is established. The model considers the main components of the slurry pressure balance shield (SPBS) machine, including support force, jacking thrust, grouting pressure, shield-rock interaction and lining-grouting interaction, as well as the detailed construction process. The purpose is to examine the excavation effects during construction, including rock deformation around tunnels, the change in pore pressure, and the response of the lining. The results show the influence range of twin-tunnel excavation on rock deformation and pore pressure, as well as the modes of lining response. In addition, this study also systematically investigates the effects of water level fluctuation and burial depth on twin-tunnel excavation. The results indicate that the increase of water level or burial depth will enhance the excavation effects and strengthen the twin-tunnel interactions. These results provide useful insights for estimating the construction impact range and degree of twin tunnels, and serve as basic references for the design of cross-river twin tunnels.
- Subjects
TUNNEL design &; construction; COMPUTER simulation; FLUID mechanics; EXCAVATION; ROCK deformation
- Publication
Underground Space (2096-2754), 2024, Vol 16, p106
- ISSN
2096-2754
- Publication type
Article
- DOI
10.1016/j.undsp.2023.09.010