Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock Strata
This research was undertaken to predict the result of vault settlement during the excavation of super-large-span tunnels in soft rock strata, which are prone to deformation and hard to predict aftermaths. Numerical simulation was applied to tackle with vault problems during excavation of super-large...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
2023-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2023/5558160 |
| _version_ | 1797846245416370176 |
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| author | Jianguang Zhou Decai Qiu Shangqu Sun Heng Zhou Diyang Chen Hao Chen Huijiang Hu Huanchun Hu |
| author_facet | Jianguang Zhou Decai Qiu Shangqu Sun Heng Zhou Diyang Chen Hao Chen Huijiang Hu Huanchun Hu |
| author_sort | Jianguang Zhou |
| collection | DOAJ |
| description | This research was undertaken to predict the result of vault settlement during the excavation of super-large-span tunnels in soft rock strata, which are prone to deformation and hard to predict aftermaths. Numerical simulation was applied to tackle with vault problems during excavation of super-large-span soft rock tunnels such as proneness to deformation and hard prediction on vault settlement. As a result, a model for continuous prediction of vault settlement as the tunnel face keeps advancing was proposed, with influencing factors such as excavation span and tunnel depth taken into consideration, and put forward the optimization of super-large-span variable-section tunnels construction scheme. The results show that the vault settlement becomes fast at the beginning of the excavation because its surrounding rocks are characterized by weakness, incompleteness, and poor stability. At the initial stage of excavation, the varying tunnel depth had a greater impact on vault settlement, indicating that the primary support has to be enhanced at the beginning of the excavation of a vault with weak surrounding rocks. As the excavation of pilot tunnels proceeds, the high-stress zone transfers to the deep part of the surrounding rocks. The tunnel vault settlement model is capable of rapidly predicting the vault settlement at locations other than the observation points. The final settlement amount is affected by the excavation span, the tunnel depth, and the basic mechanical parameters of surrounding rocks. The key to the construction of a super-large-span and variable cross-section tunnel lies in the cross-section varying parts where the stress is concentrated, thus requiring reinforcement and frequent monitoring. The research methods and analysis may provide basic data and technical means for the control of the vault settlement of large-span tunnels in soft rock strata. |
| first_indexed | 2024-04-09T17:51:51Z |
| format | Article |
| id | doaj.art-be3fb457dff34a5785783d4f310f82b0 |
| institution | Directory Open Access Journal |
| issn | 1687-8094 |
| language | English |
| last_indexed | 2024-04-09T17:51:51Z |
| publishDate | 2023-01-01 |
| publisher | Hindawi Limited |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj.art-be3fb457dff34a5785783d4f310f82b02023-04-16T00:00:10ZengHindawi LimitedAdvances in Civil Engineering1687-80942023-01-01202310.1155/2023/5558160Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock StrataJianguang Zhou0Decai Qiu1Shangqu Sun2Heng Zhou3Diyang Chen4Hao Chen5Huijiang Hu6Huanchun Hu7Suzhou Traffic Investment Construction Management Co. Ltd.Shandong University of Science and TechnologyShandong University of Science and TechnologyChina Design Group Co. Ltd.Institute of New Materials and Intelligent EquipmentChina Design Group Co. Ltd.China Design Group Co. Ltd.Shandong University of Science and TechnologyThis research was undertaken to predict the result of vault settlement during the excavation of super-large-span tunnels in soft rock strata, which are prone to deformation and hard to predict aftermaths. Numerical simulation was applied to tackle with vault problems during excavation of super-large-span soft rock tunnels such as proneness to deformation and hard prediction on vault settlement. As a result, a model for continuous prediction of vault settlement as the tunnel face keeps advancing was proposed, with influencing factors such as excavation span and tunnel depth taken into consideration, and put forward the optimization of super-large-span variable-section tunnels construction scheme. The results show that the vault settlement becomes fast at the beginning of the excavation because its surrounding rocks are characterized by weakness, incompleteness, and poor stability. At the initial stage of excavation, the varying tunnel depth had a greater impact on vault settlement, indicating that the primary support has to be enhanced at the beginning of the excavation of a vault with weak surrounding rocks. As the excavation of pilot tunnels proceeds, the high-stress zone transfers to the deep part of the surrounding rocks. The tunnel vault settlement model is capable of rapidly predicting the vault settlement at locations other than the observation points. The final settlement amount is affected by the excavation span, the tunnel depth, and the basic mechanical parameters of surrounding rocks. The key to the construction of a super-large-span and variable cross-section tunnel lies in the cross-section varying parts where the stress is concentrated, thus requiring reinforcement and frequent monitoring. The research methods and analysis may provide basic data and technical means for the control of the vault settlement of large-span tunnels in soft rock strata.http://dx.doi.org/10.1155/2023/5558160 |
| spellingShingle | Jianguang Zhou Decai Qiu Shangqu Sun Heng Zhou Diyang Chen Hao Chen Huijiang Hu Huanchun Hu Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock Strata Advances in Civil Engineering |
| title | Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock Strata |
| title_full | Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock Strata |
| title_fullStr | Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock Strata |
| title_full_unstemmed | Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock Strata |
| title_short | Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock Strata |
| title_sort | settlement prediction method of extra large diameter tunnels in soft rock strata |
| url | http://dx.doi.org/10.1155/2023/5558160 |
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