Effectiveness of Protective Strategies for Mitigating Deep Excavation Effects on Nearby Existing Tunnels
Article
| Article Title | Effectiveness of Protective Strategies for Mitigating Deep Excavation Effects on Nearby Existing Tunnels |
|---|---|
| ERA Journal ID | 4202 |
| Article Category | Article |
| Authors | Lai, Fengwen, Lu, Dechun, Tschuchnigg, Franz, Schweiger, Helmut F., Shiau, Jim, Huang, Ming and Zhou, Xin |
| Journal Title | International Journal of Geomechanics |
| Journal Citation | 26 (1) |
| Article Number | 04025316 |
| Number of Pages | 15 |
| Year | 2025 |
| Publisher | American Society of Civil Engineers |
| Place of Publication | United States |
| ISSN | 1532-3641 |
| 1943-5622 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1061/IJGNAI.GMENG-11997 |
| Web Address (URL) | https://ascelibrary.org/doi/10.1061/IJGNAI.GMENG-11997 |
| Abstract | Deep excavations in an urban environment often pose significant challenges due to their close proximity to existing tunnels. This study evaluates the effectiveness of various passive interventions designed to mitigate the effects of deep excavations on adjacent tunnels. Seven commonly used protective strategies are investigated by employing mixed-in-place columns as passive earth reinforcement, jet-grouting (JG) columns as wall reinforcement or embedded barriers, JG slabs, and their respective combinations. Cement-based materials without reinforcement are modeled using an advanced Concrete model, which accounts for strain softening in tension and crack development. The Concrete model parameters are empirically estimated and then experimentally calibrated. The superiority of the Concrete model is highlighted in comparison with the Mohr–Coulomb model. The results show that, for the case study considered, the effectiveness index of using JG slabs is much higher than other passive interventions, followed by JG columns used as wall reinforcement or embedded barriers. The findings highlight the importance of targeting the underlying mechanisms, such as basal heave, to effectively control the effects of deep excavations on nearby existing tunnels. |
| Keywords | Deep excavation; Tunnel; Protective technique; Concrete model; Strain softening |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 400502. Civil geotechnical engineering |
| Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
| Byline Affiliations | Fuzhou University, China |
| Beijing University of Technology, China | |
| Graz University of Technology, Austria | |
| School of Engineering | |
| Hong Kong University of Science and Technology, China |
https://research.usq.edu.au/item/100w62/effectiveness-of-protective-strategies-for-mitigating-deep-excavation-effects-on-nearby-existing-tunnels
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