A Simplified Calculation Method for Vertical Displacement of Shield Tunnel Caused by Adjacent Excavation

Existing tunnels are typically distorted when excavating an adjacent tunnel pathway, affecting serviceability and safety. To explore the vertical displacement of adjacent tunnels, a simplified calculation method is proposed in this paper. Firstly, the typical displacement mode of a tunnel under exca...

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Bibliographic Details
Published in:Geotechnical and geological engineering 2021-03, Vol.39 (3), p.2269-2286
Main Authors: Xu, Riqing, Shen, Shuo, Dong, Mei, Cheng, Kang
Format: Article
Language:English
Subjects:
Algorithms
Civil Engineering
Displacement
Dredging
Earth and Environmental Science
Earth Sciences
Empirical analysis
Excavation
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Mathematical analysis
Original Paper
Statistical analysis
Terrestrial Pollution
Tunneling shields
Tunnels
Waste Management/Waste Technology
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Summary:Existing tunnels are typically distorted when excavating an adjacent tunnel pathway, affecting serviceability and safety. To explore the vertical displacement of adjacent tunnels, a simplified calculation method is proposed in this paper. Firstly, the typical displacement mode of a tunnel under excavation is analyzed. To find the principal factors, the importance of factors are ranked by the random forest algorithm based on collected history cases. By statistically analyzing the principle factors, a semi-empirical formula that is relatively simple and convenient for engineering practitioners is proposed. It can be directly used to predict the maximum vertical displacement of a tunnel due to adjacent excavation. The accuracy and applicability of the proposed empirical formula is verified by comparison to field monitoring data of several project cases previously published. Based on the proposed formula, the range of effect of excavation on the tunnel is analyzed, and the results can provide theoretical guidance for similar projects.
ISSN:0960-3182
1573-1529
DOI:10.1007/s10706-020-01623-9