Characteristics of Dynamic Safety Factors during the Construction Process for a Tunnel-Group Metro Station
Dynamic safety factors during the construction of an overlapping tunnel-group metro station were studied in the framework of the strength-reduction finite element method. Based on the equivalent plastic strain and displacement of surrounding rock, its damage mode under typical excavation conditions...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/10/4900 |
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| author | Qingfei Li Ruozhou Li Weiguo He Xin Gao Xupeng Yao Yong Yuan Jiaolong Zhang |
| author_facet | Qingfei Li Ruozhou Li Weiguo He Xin Gao Xupeng Yao Yong Yuan Jiaolong Zhang |
| author_sort | Qingfei Li |
| collection | DOAJ |
| description | Dynamic safety factors during the construction of an overlapping tunnel-group metro station were studied in the framework of the strength-reduction finite element method. Based on the equivalent plastic strain and displacement of surrounding rock, its damage mode under typical excavation conditions was investigated. The aim of this investigation was to provide information for the design activities concerning the supporting system of the station and the pre-reinforcement of its surrounding ground. The accuracy of the model was assessed by comparing the ground settlements obtained from on-site monitoring with those from the numerical model. The analysis results show that the safety factor reaches the minimum when the No. 3 guide hole of the station hall is excavated. Thus, this is the most dangerous construction step. During this step, the plastic zone penetration phenomenon occurs in the surrounding rock, which is sandwiched between the hall and the platform of the station. In this case, both the deformation of the surrounding rock and the internal forces of the lining increase. The surrounding rock in the sidewall loses its stability. Thereafter, the primary support plays a role of stabilizing the guide hole. |
| first_indexed | 2024-03-10T03:24:34Z |
| format | Article |
| id | doaj.art-99de7c4c27b440918dcb901d2bf20e8e |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T03:24:34Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-99de7c4c27b440918dcb901d2bf20e8e2023-11-23T09:54:49ZengMDPI AGApplied Sciences2076-34172022-05-011210490010.3390/app12104900Characteristics of Dynamic Safety Factors during the Construction Process for a Tunnel-Group Metro StationQingfei Li0Ruozhou Li1Weiguo He2Xin Gao3Xupeng Yao4Yong Yuan5Jiaolong Zhang6China Railway Liuyuan Group Co., Ltd., Tianjin 300308, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, ChinaChina Railway Liuyuan Group Co., Ltd., Tianjin 300308, ChinaChina Railway Liuyuan Group Co., Ltd., Tianjin 300308, ChinaState Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, ChinaState Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, ChinaDynamic safety factors during the construction of an overlapping tunnel-group metro station were studied in the framework of the strength-reduction finite element method. Based on the equivalent plastic strain and displacement of surrounding rock, its damage mode under typical excavation conditions was investigated. The aim of this investigation was to provide information for the design activities concerning the supporting system of the station and the pre-reinforcement of its surrounding ground. The accuracy of the model was assessed by comparing the ground settlements obtained from on-site monitoring with those from the numerical model. The analysis results show that the safety factor reaches the minimum when the No. 3 guide hole of the station hall is excavated. Thus, this is the most dangerous construction step. During this step, the plastic zone penetration phenomenon occurs in the surrounding rock, which is sandwiched between the hall and the platform of the station. In this case, both the deformation of the surrounding rock and the internal forces of the lining increase. The surrounding rock in the sidewall loses its stability. Thereafter, the primary support plays a role of stabilizing the guide hole.https://www.mdpi.com/2076-3417/12/10/4900strength-reduction finite element methodon-site monitoringarch cover methodsafety factorequivalent plastic strain |
| spellingShingle | Qingfei Li Ruozhou Li Weiguo He Xin Gao Xupeng Yao Yong Yuan Jiaolong Zhang Characteristics of Dynamic Safety Factors during the Construction Process for a Tunnel-Group Metro Station Applied Sciences strength-reduction finite element method on-site monitoring arch cover method safety factor equivalent plastic strain |
| title | Characteristics of Dynamic Safety Factors during the Construction Process for a Tunnel-Group Metro Station |
| title_full | Characteristics of Dynamic Safety Factors during the Construction Process for a Tunnel-Group Metro Station |
| title_fullStr | Characteristics of Dynamic Safety Factors during the Construction Process for a Tunnel-Group Metro Station |
| title_full_unstemmed | Characteristics of Dynamic Safety Factors during the Construction Process for a Tunnel-Group Metro Station |
| title_short | Characteristics of Dynamic Safety Factors during the Construction Process for a Tunnel-Group Metro Station |
| title_sort | characteristics of dynamic safety factors during the construction process for a tunnel group metro station |
| topic | strength-reduction finite element method on-site monitoring arch cover method safety factor equivalent plastic strain |
| url | https://www.mdpi.com/2076-3417/12/10/4900 |
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