Stability of Braced Excavation Underneath Crossing Underground Large Pressurized Pipelines

The practice of deep-braced excavation in congested urban environments involves frequently buried pipelines, which can exert a significant effect on the performance of the excavation. The objective of this paper is to investigate the performance of a 12.5-m-deep-braced excavation spanned by two shal...

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Bibliographic Details
Published in:Water (Basel) 2022-12, Vol.14 (23), p.3867
Main Authors: Li, Fangang, Guo, Panpan, Geng, Ningning, Mao, Lei, Lin, Feng, Zhao, Yanlin, Lin, Hang, Wang, Yixian
Format: Article
Language:English
Subjects:
Bending moments
Boundary conditions
Buried pipes
Buried structures
Civil engineering
Concrete
Construction
Deformation
Excavation
Finite element analysis
Finite element method
Groundwater
High rise buildings
Investigations
Measurement
Mechanical properties
Pipelines
Reinforcement (structures)
Safety and security measures
Shear (Mechanics)
Shear forces
Software
Struts
Three dimensional analysis
Underground pipe lines
Urban environments
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Summary:The practice of deep-braced excavation in congested urban environments involves frequently buried pipelines, which can exert a significant effect on the performance of the excavation. The objective of this paper is to investigate the performance of a 12.5-m-deep-braced excavation spanned by two shallowly buried large-diameter pressurized pipelines. A suspension structure is installed within the excavation to protect the in situ pipelines during the construction. The excavation performance is investigated by performing a three-dimensional finite element analysis. The finite element method is verified based on the observations at the site. The results indicate that, as expected, the excavation support structures displace together with varying degrees of deformation toward the excavated area. The strut shear forces are found to be distributed axially in linear manners, while the strut bending moments are in symmetric manners. The benefit of using the proposed pipeline suspension structure is demonstrated. By using this structure, pipeline deformation can be well controlled, and the structural integrity and safety of the pipelines can be ensured. This benefit depends on the convenient operation in that the elevation of the cork base of the pipeline suspension structure is stably lowered during the construction process.
ISSN:2073-4441
2073-4441
DOI:10.3390/w14233867