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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Main Authors: Fangang Li, Panpan Guo, Ningning Geng, Lei Mao, Feng Lin, Yanlin Zhao, Hang Lin, Yixian Wang
Format: Article
Language:English
Published: MDPI AG 2022-11-01
Series:Water
Subjects:
Online Access:https://www.mdpi.com/2073-4441/14/23/3867
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author Fangang Li
Panpan Guo
Ningning Geng
Lei Mao
Feng Lin
Yanlin Zhao
Hang Lin
Yixian Wang
author_facet Fangang Li
Panpan Guo
Ningning Geng
Lei Mao
Feng Lin
Yanlin Zhao
Hang Lin
Yixian Wang
author_sort Fangang Li
collection DOAJ
description 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.
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spelling doaj.art-aa47a48e94604b26a2f552ea71ac793f2023-11-24T12:32:35ZengMDPI AGWater2073-44412022-11-011423386710.3390/w14233867Stability of Braced Excavation Underneath Crossing Underground Large Pressurized PipelinesFangang Li0Panpan Guo1Ningning Geng2Lei Mao3Feng Lin4Yanlin Zhao5Hang Lin6Yixian Wang7Anhui Traffic Construction Co., Ltd., Hefei 230041, ChinaCollege of Civil Engineering, Hefei University of Technology, Hefei 230009, ChinaHefei Rail Transit Group Co., Ltd., Hefei 230001, ChinaHefei Urban Construction Investment Holding Co., Ltd., Hefei 230092, ChinaHefei Urban Construction Investment Holding Co., Ltd., Hefei 230092, ChinaSchool of Energy and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaCollege of Civil Engineering, Hefei University of Technology, Hefei 230009, ChinaThe 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.https://www.mdpi.com/2073-4441/14/23/3867deep excavationstructural responseurban environmentburied pipelinedeformation analysis
spellingShingle Fangang Li
Panpan Guo
Ningning Geng
Lei Mao
Feng Lin
Yanlin Zhao
Hang Lin
Yixian Wang
Stability of Braced Excavation Underneath Crossing Underground Large Pressurized Pipelines
Water
deep excavation
structural response
urban environment
buried pipeline
deformation analysis
title Stability of Braced Excavation Underneath Crossing Underground Large Pressurized Pipelines
title_full Stability of Braced Excavation Underneath Crossing Underground Large Pressurized Pipelines
title_fullStr Stability of Braced Excavation Underneath Crossing Underground Large Pressurized Pipelines
title_full_unstemmed Stability of Braced Excavation Underneath Crossing Underground Large Pressurized Pipelines
title_short Stability of Braced Excavation Underneath Crossing Underground Large Pressurized Pipelines
title_sort stability of braced excavation underneath crossing underground large pressurized pipelines
topic deep excavation
structural response
urban environment
buried pipeline
deformation analysis
url https://www.mdpi.com/2073-4441/14/23/3867
work_keys_str_mv AT fangangli stabilityofbracedexcavationunderneathcrossingundergroundlargepressurizedpipelines
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AT ningninggeng stabilityofbracedexcavationunderneathcrossingundergroundlargepressurizedpipelines
AT leimao stabilityofbracedexcavationunderneathcrossingundergroundlargepressurizedpipelines
AT fenglin stabilityofbracedexcavationunderneathcrossingundergroundlargepressurizedpipelines
AT yanlinzhao stabilityofbracedexcavationunderneathcrossingundergroundlargepressurizedpipelines
AT hanglin stabilityofbracedexcavationunderneathcrossingundergroundlargepressurizedpipelines
AT yixianwang stabilityofbracedexcavationunderneathcrossingundergroundlargepressurizedpipelines