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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MDPI AG
2022-11-01
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Series: | Water |
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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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id | doaj.art-aa47a48e94604b26a2f552ea71ac793f |
institution | Directory Open Access Journal |
issn | 2073-4441 |
language | English |
last_indexed | 2024-03-09T17:28:14Z |
publishDate | 2022-11-01 |
publisher | MDPI AG |
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series | Water |
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 |
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