Calculation Model and Influencing Factors of Surrounding Rock Loosening Pressure for Tunnel in Fold Zone
This research aims to study the surrounding rock loosening pressure variation law of tunnel in the fold area. Based on the calculation method of surrounding rock loosening pressure for shallow tunnel, a new calculation model of the surrounding rock pressure was proposed for tunnel in the fold area;...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/6678511 |
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| author | Jianhao Liu Caijin Xie Junying Rao |
| author_facet | Jianhao Liu Caijin Xie Junying Rao |
| author_sort | Jianhao Liu |
| collection | DOAJ |
| description | This research aims to study the surrounding rock loosening pressure variation law of tunnel in the fold area. Based on the calculation method of surrounding rock loosening pressure for shallow tunnel, a new calculation model of the surrounding rock pressure was proposed for tunnel in the fold area; through this calculation model, the effects of tectonic stress (F), the angle (φ1) between tectonic stress and horizontal plane, tunnel buried depth (h), friction angle (θ), the multiple (k) between tectonic stress and rock mass gravity in the upper part of the tunnel, lateral pressure coefficient (λ), and tunnel midline offset (t) on tunnel surrounding rock loosening pressure in fold area are studied, respectively. Results show that in the anticline area, when φ1 increases, the vertical loosening pressure (q) decreases; when q > 0, the surrounding rock is in the elastic deformation stage, and q decreases monotonously as F increases; when q < 0, the rock mass is in the initial stage of failure, and as F continues to increase, the number of internal cracks increases, the rock mass reaches its ultimate bearing capacity and then fails completely, and q increases linearly in this process; q decreases with the increase of θ and k; the greater k is, the easier it is to reach its bearing limit; the horizontal loosening pressure (e) increased monotonously with the increase of h and λ. The research process of surrounding rock loosening pressure of tunnel in the syncline area is similar to that of tunnel in the anticline area; q decreases with the increase of θ and λ; q monotonically increases with F increasing. |
| format | Article |
| id | doaj-art-0018e31c4e704f7ba4ebbc17590d18cf |
| institution | OA Journals |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-0018e31c4e704f7ba4ebbc17590d18cf2025-08-20T02:03:15ZengWileyAdvances in Civil Engineering1687-80861687-80942021-01-01202110.1155/2021/66785116678511Calculation Model and Influencing Factors of Surrounding Rock Loosening Pressure for Tunnel in Fold ZoneJianhao Liu0Caijin Xie1Junying Rao2School of Civil Engineering, Guizhou University, Guiyang, Guizhou Province 550025, ChinaSchool of Civil Engineering, Guizhou University, Guiyang, Guizhou Province 550025, ChinaSchool of Civil Engineering, Guizhou University, Guiyang, Guizhou Province 550025, ChinaThis research aims to study the surrounding rock loosening pressure variation law of tunnel in the fold area. Based on the calculation method of surrounding rock loosening pressure for shallow tunnel, a new calculation model of the surrounding rock pressure was proposed for tunnel in the fold area; through this calculation model, the effects of tectonic stress (F), the angle (φ1) between tectonic stress and horizontal plane, tunnel buried depth (h), friction angle (θ), the multiple (k) between tectonic stress and rock mass gravity in the upper part of the tunnel, lateral pressure coefficient (λ), and tunnel midline offset (t) on tunnel surrounding rock loosening pressure in fold area are studied, respectively. Results show that in the anticline area, when φ1 increases, the vertical loosening pressure (q) decreases; when q > 0, the surrounding rock is in the elastic deformation stage, and q decreases monotonously as F increases; when q < 0, the rock mass is in the initial stage of failure, and as F continues to increase, the number of internal cracks increases, the rock mass reaches its ultimate bearing capacity and then fails completely, and q increases linearly in this process; q decreases with the increase of θ and k; the greater k is, the easier it is to reach its bearing limit; the horizontal loosening pressure (e) increased monotonously with the increase of h and λ. The research process of surrounding rock loosening pressure of tunnel in the syncline area is similar to that of tunnel in the anticline area; q decreases with the increase of θ and λ; q monotonically increases with F increasing.http://dx.doi.org/10.1155/2021/6678511 |
| spellingShingle | Jianhao Liu Caijin Xie Junying Rao Calculation Model and Influencing Factors of Surrounding Rock Loosening Pressure for Tunnel in Fold Zone Advances in Civil Engineering |
| title | Calculation Model and Influencing Factors of Surrounding Rock Loosening Pressure for Tunnel in Fold Zone |
| title_full | Calculation Model and Influencing Factors of Surrounding Rock Loosening Pressure for Tunnel in Fold Zone |
| title_fullStr | Calculation Model and Influencing Factors of Surrounding Rock Loosening Pressure for Tunnel in Fold Zone |
| title_full_unstemmed | Calculation Model and Influencing Factors of Surrounding Rock Loosening Pressure for Tunnel in Fold Zone |
| title_short | Calculation Model and Influencing Factors of Surrounding Rock Loosening Pressure for Tunnel in Fold Zone |
| title_sort | calculation model and influencing factors of surrounding rock loosening pressure for tunnel in fold zone |
| url | http://dx.doi.org/10.1155/2021/6678511 |
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