Deformation and Stress Law of Surrounding Rock for a Bifurcated Tunnel with a Super-Large Section: A Case Study
The construction method of transitioning from a small cross-section to excavating a super-large cross-section tunnel plays a crucial role in the quality of the final super-large cross-section tunnel and the safety of the tunnel structures and workers during the construction process. The Shenzhen Lia...
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MDPI AG
2023-11-01
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| Online Access: | https://www.mdpi.com/2076-3417/13/23/12852 |
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| author | Xiaodong Wu Yu Li Min Gong Haojun Wu Yifan Wu |
| author_facet | Xiaodong Wu Yu Li Min Gong Haojun Wu Yifan Wu |
| author_sort | Xiaodong Wu |
| collection | DOAJ |
| description | The construction method of transitioning from a small cross-section to excavating a super-large cross-section tunnel plays a crucial role in the quality of the final super-large cross-section tunnel and the safety of the tunnel structures and workers during the construction process. The Shenzhen Liantang Bifurcated Tunnel, with a maximum cross-sectional area of 428.4 m<sup>2</sup>, was the largest cross-sectional tunnel constructed in China in 2018, and there are few engineering projects that can serve as references. To enhance construction safety and achieve the transformation from a two-lane tunnel to a five-lane tunnel, this paper proposes two tunneling methods, namely, the reverse top-heading method and the advance climbing method. Moreover, numerical simulation using MIDAS GTS/NX software was adapted to compare and analyze the stress and deformation characteristics of the surrounding rock in the construction stages using the two methods. The simulation shows that the advance climbing method is more suitable for the construction of the Liantang tunnel. Through on-site monitoring and measurement, the data of peripheral rock vault subsidence, peripheral convergence, and pressure of the supporting structure were assessed. The results show that the maximum values of peripheral rock vault subsidence and peripheral convergence displacement are located in the permissible range of road tunnel vault subsidence. This further verifies the reasonableness of the advance climbing method. This paper not only provide a basis for the construction of the Liantang tunnel but also serves as a reference for construction methods and typical cases for similar super-large-section tunnel projects. |
| first_indexed | 2024-03-09T01:54:43Z |
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| id | doaj.art-49f4dee143df4b8b95701d6bfa0ff7e8 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T01:54:43Z |
| publishDate | 2023-11-01 |
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| series | Applied Sciences |
| spelling | doaj.art-49f4dee143df4b8b95701d6bfa0ff7e82023-12-08T15:11:56ZengMDPI AGApplied Sciences2076-34172023-11-0113231285210.3390/app132312852Deformation and Stress Law of Surrounding Rock for a Bifurcated Tunnel with a Super-Large Section: A Case StudyXiaodong Wu0Yu Li1Min Gong2Haojun Wu3Yifan Wu4Department of Safety Science and Engineering, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaDepartment of Safety Science and Engineering, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaDepartment of Safety Science and Engineering, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaDepartment of Safety Science and Engineering, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaDepartment of Safety Science and Engineering, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaThe construction method of transitioning from a small cross-section to excavating a super-large cross-section tunnel plays a crucial role in the quality of the final super-large cross-section tunnel and the safety of the tunnel structures and workers during the construction process. The Shenzhen Liantang Bifurcated Tunnel, with a maximum cross-sectional area of 428.4 m<sup>2</sup>, was the largest cross-sectional tunnel constructed in China in 2018, and there are few engineering projects that can serve as references. To enhance construction safety and achieve the transformation from a two-lane tunnel to a five-lane tunnel, this paper proposes two tunneling methods, namely, the reverse top-heading method and the advance climbing method. Moreover, numerical simulation using MIDAS GTS/NX software was adapted to compare and analyze the stress and deformation characteristics of the surrounding rock in the construction stages using the two methods. The simulation shows that the advance climbing method is more suitable for the construction of the Liantang tunnel. Through on-site monitoring and measurement, the data of peripheral rock vault subsidence, peripheral convergence, and pressure of the supporting structure were assessed. The results show that the maximum values of peripheral rock vault subsidence and peripheral convergence displacement are located in the permissible range of road tunnel vault subsidence. This further verifies the reasonableness of the advance climbing method. This paper not only provide a basis for the construction of the Liantang tunnel but also serves as a reference for construction methods and typical cases for similar super-large-section tunnel projects.https://www.mdpi.com/2076-3417/13/23/12852bifurcated tunnelsuper-large-section tunnelconstruction methodnumerical simulationmonitoring and measurement |
| spellingShingle | Xiaodong Wu Yu Li Min Gong Haojun Wu Yifan Wu Deformation and Stress Law of Surrounding Rock for a Bifurcated Tunnel with a Super-Large Section: A Case Study Applied Sciences bifurcated tunnel super-large-section tunnel construction method numerical simulation monitoring and measurement |
| title | Deformation and Stress Law of Surrounding Rock for a Bifurcated Tunnel with a Super-Large Section: A Case Study |
| title_full | Deformation and Stress Law of Surrounding Rock for a Bifurcated Tunnel with a Super-Large Section: A Case Study |
| title_fullStr | Deformation and Stress Law of Surrounding Rock for a Bifurcated Tunnel with a Super-Large Section: A Case Study |
| title_full_unstemmed | Deformation and Stress Law of Surrounding Rock for a Bifurcated Tunnel with a Super-Large Section: A Case Study |
| title_short | Deformation and Stress Law of Surrounding Rock for a Bifurcated Tunnel with a Super-Large Section: A Case Study |
| title_sort | deformation and stress law of surrounding rock for a bifurcated tunnel with a super large section a case study |
| topic | bifurcated tunnel super-large-section tunnel construction method numerical simulation monitoring and measurement |
| url | https://www.mdpi.com/2076-3417/13/23/12852 |
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