Face stability of shield tunnels considering a kinematically admissible velocity field of soil arching
Existing mechanism of simulating soil movement at tunnel face is generally based on the translational or rotational velocity field, which is, to some extent, different from the real soil movement in the arching zone. Numerical simulations are carried out first to investigate the characteristics of t...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-04-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775521001797 |
| _version_ | 1811329556084162560 |
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| author | Wei Li Chengping Zhang Dingli Zhang Zijian Ye Zhibiao Tan |
| author_facet | Wei Li Chengping Zhang Dingli Zhang Zijian Ye Zhibiao Tan |
| author_sort | Wei Li |
| collection | DOAJ |
| description | Existing mechanism of simulating soil movement at tunnel face is generally based on the translational or rotational velocity field, which is, to some extent, different from the real soil movement in the arching zone. Numerical simulations are carried out first to investigate the characteristics of the velocity distribution at tunnel face and above tunnel vault. Then a new kinematically admissible velocity field is proposed to improve the description of the soil movement according to the results of the numerical simulation. Based on the proposed velocity field, an improved failure mechanism is constructed adopting the spatial discretization technique, which takes into account soil arching effect and plastic deformation within soil mass. Finally, the critical face pressure and the proposed mechanism are compared with the results of the numerical simulation, existing analytical studies and experimental tests to verify the accuracy and improvement of the presented method. The proposed mechanism can serve as an alternative approach for the face stability analysis. |
| first_indexed | 2024-04-13T15:45:58Z |
| format | Article |
| id | doaj.art-f43dbaf3064d4721b62603a9d648e120 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-04-13T15:45:58Z |
| publishDate | 2022-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-f43dbaf3064d4721b62603a9d648e1202022-12-22T02:41:00ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552022-04-01142505526Face stability of shield tunnels considering a kinematically admissible velocity field of soil archingWei Li0Chengping Zhang1Dingli Zhang2Zijian Ye3Zhibiao Tan4Key Laboratory for Urban Underground Engineering of the Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China; School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, ChinaKey Laboratory for Urban Underground Engineering of the Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China; School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China; Corresponding author. Key Laboratory for Urban Underground Engineering of the Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China.Key Laboratory for Urban Underground Engineering of the Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China; School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, ChinaKey Laboratory for Urban Underground Engineering of the Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China; School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, ChinaKey Laboratory for Urban Underground Engineering of the Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China; School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, ChinaExisting mechanism of simulating soil movement at tunnel face is generally based on the translational or rotational velocity field, which is, to some extent, different from the real soil movement in the arching zone. Numerical simulations are carried out first to investigate the characteristics of the velocity distribution at tunnel face and above tunnel vault. Then a new kinematically admissible velocity field is proposed to improve the description of the soil movement according to the results of the numerical simulation. Based on the proposed velocity field, an improved failure mechanism is constructed adopting the spatial discretization technique, which takes into account soil arching effect and plastic deformation within soil mass. Finally, the critical face pressure and the proposed mechanism are compared with the results of the numerical simulation, existing analytical studies and experimental tests to verify the accuracy and improvement of the presented method. The proposed mechanism can serve as an alternative approach for the face stability analysis.http://www.sciencedirect.com/science/article/pii/S1674775521001797Tunnel face stabilityVelocity fieldFailure patternImproved failure mechanismCritical face pressure |
| spellingShingle | Wei Li Chengping Zhang Dingli Zhang Zijian Ye Zhibiao Tan Face stability of shield tunnels considering a kinematically admissible velocity field of soil arching Journal of Rock Mechanics and Geotechnical Engineering Tunnel face stability Velocity field Failure pattern Improved failure mechanism Critical face pressure |
| title | Face stability of shield tunnels considering a kinematically admissible velocity field of soil arching |
| title_full | Face stability of shield tunnels considering a kinematically admissible velocity field of soil arching |
| title_fullStr | Face stability of shield tunnels considering a kinematically admissible velocity field of soil arching |
| title_full_unstemmed | Face stability of shield tunnels considering a kinematically admissible velocity field of soil arching |
| title_short | Face stability of shield tunnels considering a kinematically admissible velocity field of soil arching |
| title_sort | face stability of shield tunnels considering a kinematically admissible velocity field of soil arching |
| topic | Tunnel face stability Velocity field Failure pattern Improved failure mechanism Critical face pressure |
| url | http://www.sciencedirect.com/science/article/pii/S1674775521001797 |
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