Upper Shallow Foundation Pit Engineering: Utilization and Evaluation of Portal Frame Anti-Heave Structures
The excavation of upper shallow foundation pits may cause the uneven deformation of existing tunnels buried below a shallow depth. Improper control measures may lead to a series of diseases, such as local cracking or breakage of the tunnel lining, which threaten the safety of tunnel operations. Rega...
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MDPI AG
2025-06-01
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| author | Jun He Jinping Ou Xiangsheng Chen Shuya Liu Kewen Huang Xu Zhang |
| author_facet | Jun He Jinping Ou Xiangsheng Chen Shuya Liu Kewen Huang Xu Zhang |
| author_sort | Jun He |
| collection | DOAJ |
| description | The excavation of upper shallow foundation pits may cause the uneven deformation of existing tunnels buried below a shallow depth. Improper control measures may lead to a series of diseases, such as local cracking or breakage of the tunnel lining, which threaten the safety of tunnel operations. Regarding the safety of the existing tunnel affected by the construction of the foundation pit, cases of the application of portal frame anti-heave structures in upper foundation pit projects of existing tunnels in Shenzhen have been documented, and the main influencing factors have been analyzed and summarized. Taking the Qianhai Ring Water Corridor Project as an example, numerical orthogonal experiments were conducted to analyze the deformation response patterns in the depth of existing tunnels and the effectiveness of control measures in the upper shallow of foundation pit engineering. The roles of portal frame anti-heave structures are analyzed in detail using measured data. Studies indicate that the deformation of the existing tunnels mainly occurs during the top and immediately adjacent block excavation stages, and stabilizes after the uplift-resisting piles and anti-floating slabs form an effective frame structure. The portal frame anti-heave structures, combined with measures such as block excavation, jet grouting interlocking reinforcement, backfilling, and surcharge loading, have extremely strong deformation control capabilities. However, the construction costs are relatively high, leaving room for optimization. |
| format | Article |
| id | doaj-art-6b67a1ed4eac434aad5df454a1fc5a9c |
| institution | DOAJ |
| issn | 2075-5309 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
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| series | Buildings |
| spelling | doaj-art-6b67a1ed4eac434aad5df454a1fc5a9c2025-08-20T03:11:22ZengMDPI AGBuildings2075-53092025-06-011511194310.3390/buildings15111943Upper Shallow Foundation Pit Engineering: Utilization and Evaluation of Portal Frame Anti-Heave StructuresJun He0Jinping Ou1Xiangsheng Chen2Shuya Liu3Kewen Huang4Xu Zhang5School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, ChinaShenzhen Metro Group Co., Ltd., Shenzhen 518026, ChinaCollege of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaSchool of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, ChinaSchool of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, ChinaSchool of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, ChinaThe excavation of upper shallow foundation pits may cause the uneven deformation of existing tunnels buried below a shallow depth. Improper control measures may lead to a series of diseases, such as local cracking or breakage of the tunnel lining, which threaten the safety of tunnel operations. Regarding the safety of the existing tunnel affected by the construction of the foundation pit, cases of the application of portal frame anti-heave structures in upper foundation pit projects of existing tunnels in Shenzhen have been documented, and the main influencing factors have been analyzed and summarized. Taking the Qianhai Ring Water Corridor Project as an example, numerical orthogonal experiments were conducted to analyze the deformation response patterns in the depth of existing tunnels and the effectiveness of control measures in the upper shallow of foundation pit engineering. The roles of portal frame anti-heave structures are analyzed in detail using measured data. Studies indicate that the deformation of the existing tunnels mainly occurs during the top and immediately adjacent block excavation stages, and stabilizes after the uplift-resisting piles and anti-floating slabs form an effective frame structure. The portal frame anti-heave structures, combined with measures such as block excavation, jet grouting interlocking reinforcement, backfilling, and surcharge loading, have extremely strong deformation control capabilities. However, the construction costs are relatively high, leaving room for optimization.https://www.mdpi.com/2075-5309/15/11/1943upper shallow foundation pitexisting tunneldeformation controlorthogonal experimentportal frame |
| spellingShingle | Jun He Jinping Ou Xiangsheng Chen Shuya Liu Kewen Huang Xu Zhang Upper Shallow Foundation Pit Engineering: Utilization and Evaluation of Portal Frame Anti-Heave Structures Buildings upper shallow foundation pit existing tunnel deformation control orthogonal experiment portal frame |
| title | Upper Shallow Foundation Pit Engineering: Utilization and Evaluation of Portal Frame Anti-Heave Structures |
| title_full | Upper Shallow Foundation Pit Engineering: Utilization and Evaluation of Portal Frame Anti-Heave Structures |
| title_fullStr | Upper Shallow Foundation Pit Engineering: Utilization and Evaluation of Portal Frame Anti-Heave Structures |
| title_full_unstemmed | Upper Shallow Foundation Pit Engineering: Utilization and Evaluation of Portal Frame Anti-Heave Structures |
| title_short | Upper Shallow Foundation Pit Engineering: Utilization and Evaluation of Portal Frame Anti-Heave Structures |
| title_sort | upper shallow foundation pit engineering utilization and evaluation of portal frame anti heave structures |
| topic | upper shallow foundation pit existing tunnel deformation control orthogonal experiment portal frame |
| url | https://www.mdpi.com/2075-5309/15/11/1943 |
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