Analysis of ultra-deep five-level underground station excavation in soft soil and its impact on existing structures
- 1School of Civil Engineering, Tianjin University
- 2Shanghai Urban Construction Design & Research Institute (Group) Co., Ltd.
- 3China Construction Eighth Engineering Division Corp. Ltd
Abstract
The deformation of adjacent existing structures induced by ultra-deep excavation in soft soil regions is a key technical challenge in urban underground space development. This study is based on an excavation of transfer station of Tianjin Metro Line 8, with a maximum depth of 38.3 m. A three-dimensional finite element model was established and validated against field measurement data, followed by systematic parametric analyses. The results reveal that adjacent buildings significantly amplify excavation-induced ground deformation, while the location of maximum settlement exhibits a regular migration trend with varying building distances. The existing underground station exhibits a pronounced shielding effect, effectively reducing excavation-induced ground settlement and diaphragm wall lateral displacement. The station undergoes torsional deformation towards the excavation, and its floor slab exhibits a characteristic “M”-shaped uplift pattern. The spacing between the station and the excavation is identified as the dominant factor controlling the shielding effect, whereas the influence of station burial depth is relatively minor. Increasing the burial depth tends to amplify lateral displacement of the side wall, whereas increasing the station–excavation spacing effectively reduces such displacement. The findings provide a quantitative theoretical basis for the design and construction of ultra-deep excavations adjacent to existing structures in soft soil regions.
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BibTeX
@article{zhang2026analysis,
title = {{Analysis of ultra-deep five-level underground station excavation in soft soil and its impact on existing structures}},
author = {Zhongjie Zhang and Wenkai Wang and Haoran Wang and Bing Li and Gang Zheng and Qinghan Li and Xuesong Cheng},
journal = {Scientific Reports},
year = {2026},
month = jul,
doi = {10.1038/s41598-026-62426-1},
url = {https://doi.org/10.1038/s41598-026-62426-1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Analysis of ultra-deep five-level underground station excavation in soft soil and its impact on existing structures
AU - Zhongjie Zhang
AU - Wenkai Wang
AU - Haoran Wang
AU - Bing Li
AU - Gang Zheng
AU - Qinghan Li
AU - Xuesong Cheng
PY - 2026
DA - 2026/07/01
JO - Scientific Reports
DO - 10.1038/s41598-026-62426-1
UR - https://doi.org/10.1038/s41598-026-62426-1
AB - The deformation of adjacent existing structures induced by ultra-deep excavation in soft soil regions is a key technical challenge in urban underground space development. This study is based on an excavation of transfer station of Tianjin Metro Line 8, with a maximum depth of 38.3 m. A three-dimensional finite element model was established and validated against field measurement data, followed by systematic parametric analyses. The results reveal that adjacent buildings significantly amplify excavation-induced ground deformation, while the location of maximum settlement exhibits a regular migration trend with varying building distances. The existing underground station exhibits a pronounced shielding effect, effectively reducing excavation-induced ground settlement and diaphragm wall lateral displacement. The station undergoes torsional deformation towards the excavation, and its floor slab exhibits a characteristic “M”-shaped uplift pattern. The spacing between the station and the excavation is identified as the dominant factor controlling the shielding effect, whereas the influence of station burial depth is relatively minor. Increasing the burial depth tends to amplify lateral displacement of the side wall, whereas increasing the station–excavation spacing effectively reduces such displacement. The findings provide a quantitative theoretical basis for the design and construction of ultra-deep excavations adjacent to existing structures in soft soil regions.
SN - 2045-2322
ER -