Analysis of Arch Forming Factors of Shallow Buried Hard Rock Tunnel under Overlying Load
To investigate the arching effect of shallow buried hard rock tunnels under overlying load, the engineering scenario of a subway station on Qingdao Metro Line 6 is utilized. A large-scale tunnel loading model test is conducted, in conjunction with finite element numerical simulations, to analyze the...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-08-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/13/9/2210 |
| _version_ | 1827726847147769856 |
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| author | Lixue Cao Wentai Cui Zhe Qin Rui Xu Tongtong Wang Yanbing Liu |
| author_facet | Lixue Cao Wentai Cui Zhe Qin Rui Xu Tongtong Wang Yanbing Liu |
| author_sort | Lixue Cao |
| collection | DOAJ |
| description | To investigate the arching effect of shallow buried hard rock tunnels under overlying load, the engineering scenario of a subway station on Qingdao Metro Line 6 is utilized. A large-scale tunnel loading model test is conducted, in conjunction with finite element numerical simulations, to analyze the impact of various overburden ratios on strata arching. The results show that: when the tunnel excavation span is certain, with an increase in the overlying rock mass, the stress diffusion process of the surrounding rock can be better accomplished to form the arch effect. This means that the thickness of the overburden of the tunnel determines whether or not the surrounding rock appears to have a stratified arch effect. When the tunnel overlying rock thickness is certain, the span of the tunnel determines the shape of the formation into an arch, that is, the curvature of the arch. The joint surface is an important factor in tunnel stability. When the overlying load increases to a certain value, the rock mass at the joint plane slips relatively, leading to the displacement phenomenon of the surrounding rock, which then affects the formation and shape of the formation arch. |
| first_indexed | 2024-03-10T22:58:39Z |
| format | Article |
| id | doaj.art-bad2b74362554b218b589dfacb10e03e |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-10T22:58:39Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-bad2b74362554b218b589dfacb10e03e2023-11-19T09:50:55ZengMDPI AGBuildings2075-53092023-08-01139221010.3390/buildings13092210Analysis of Arch Forming Factors of Shallow Buried Hard Rock Tunnel under Overlying LoadLixue Cao0Wentai Cui1Zhe Qin2Rui Xu3Tongtong Wang4Yanbing Liu5Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao 266000, ChinaKey Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao 266000, ChinaKey Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao 266000, ChinaKey Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao 266000, ChinaKey Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao 266000, ChinaAdministrative Committee of China-SCO Local Economic and Trade Cooperation Demonstration Area, Qingdao 266000, ChinaTo investigate the arching effect of shallow buried hard rock tunnels under overlying load, the engineering scenario of a subway station on Qingdao Metro Line 6 is utilized. A large-scale tunnel loading model test is conducted, in conjunction with finite element numerical simulations, to analyze the impact of various overburden ratios on strata arching. The results show that: when the tunnel excavation span is certain, with an increase in the overlying rock mass, the stress diffusion process of the surrounding rock can be better accomplished to form the arch effect. This means that the thickness of the overburden of the tunnel determines whether or not the surrounding rock appears to have a stratified arch effect. When the tunnel overlying rock thickness is certain, the span of the tunnel determines the shape of the formation into an arch, that is, the curvature of the arch. The joint surface is an important factor in tunnel stability. When the overlying load increases to a certain value, the rock mass at the joint plane slips relatively, leading to the displacement phenomenon of the surrounding rock, which then affects the formation and shape of the formation arch.https://www.mdpi.com/2075-5309/13/9/2210tunnelingshallow buried hard rock tunnelarch effectoverlying loadsimilar model testnumerical simulations |
| spellingShingle | Lixue Cao Wentai Cui Zhe Qin Rui Xu Tongtong Wang Yanbing Liu Analysis of Arch Forming Factors of Shallow Buried Hard Rock Tunnel under Overlying Load Buildings tunneling shallow buried hard rock tunnel arch effect overlying load similar model test numerical simulations |
| title | Analysis of Arch Forming Factors of Shallow Buried Hard Rock Tunnel under Overlying Load |
| title_full | Analysis of Arch Forming Factors of Shallow Buried Hard Rock Tunnel under Overlying Load |
| title_fullStr | Analysis of Arch Forming Factors of Shallow Buried Hard Rock Tunnel under Overlying Load |
| title_full_unstemmed | Analysis of Arch Forming Factors of Shallow Buried Hard Rock Tunnel under Overlying Load |
| title_short | Analysis of Arch Forming Factors of Shallow Buried Hard Rock Tunnel under Overlying Load |
| title_sort | analysis of arch forming factors of shallow buried hard rock tunnel under overlying load |
| topic | tunneling shallow buried hard rock tunnel arch effect overlying load similar model test numerical simulations |
| url | https://www.mdpi.com/2075-5309/13/9/2210 |
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