Numerical Simulation of the Influence of a Deep Foundation Pit Adjacent to a Utility Tunnel: Case Study
Publication: Practice Periodical on Structural Design and Construction
Volume 29, Issue 3
Abstract
Excavation of foundation pits can cause deformation and differential settlement to nearby pipe gallery structures, potentially resulting in significant issues such as seepage and structural damage. Based on a deep foundation pit construction project for a residential building plot adjacent to the Wuhan-Jiujiang utility tunnel, a three-dimensional finite element analysis model with cement-soil mixed wall (SMW) and trench cutting remixing deep wall (TRD)-drilled pile is established to study the impact of the excavation process on the utility tunnel. The results indicate that as the foundation pit excavation depth increases, the lateral deformation of the drilled pile support structure shows an initial increase followed by a subsequent decrease, and the maximum lateral deformation occurs at the point approximately one-third from the bottom of the foundation pit. Besides, the surface settlement exhibits an initial increase, followed by a subsequent decrease and eventual stabilization. The deformation of the utility tunnel structure causing by excavation is always within specified limit of 15 mm. Compared to the structure before excavation, the maximum values of axial force, shear force, and bending moment of the utility tunnel increases by 0.09%, 0.14%, and 4.88%, respectively. The stress variation is small, which satisfies the safety requirements for its usage, the feasibility of the TRD-drilled pile support structure is demonstrated. This study can serve as a reference for safety assessment of comparable engineering projects.
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Data Availability Statement
The data used in this study can be provided by the corresponding author upon request.
Acknowledgments
The authors would like to acknowledge the financial support from Scientific Research Fund of Hunan Provincial Education Department (Grant Nos. 22C1492, 22C1495, 23C1124).
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Information & Authors
Information
Published In
Practice Periodical on Structural Design and Construction
Volume 29 • Issue 3 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: May 24, 2023
Accepted: Feb 12, 2024
Published online: May 21, 2024
Published in print: Aug 1, 2024
Discussion open until: Oct 21, 2024
ASCE Technical Topics:
- Construction engineering
- Construction methods
- Continuum mechanics
- Deformation (mechanics)
- Engineering fundamentals
- Engineering mechanics
- Excavation
- Foundation construction
- Foundations
- Geotechnical engineering
- Infrastructure
- Lifeline systems
- Models (by type)
- Numerical models
- Pile foundations
- Solid mechanics
- Structural mechanics
- Tunnels
- Utilities
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