Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate
Affected by dip angle and thickness of strata and the tunneling method, soft rock tunnel has obvious characteristics of large deformation, long deformation time and difficult support. Based on a case study of Gelong the deformation and failure mechanism of surrounding rock, stress characteristics of...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.1094325/full |
| _version_ | 1797957573618434048 |
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| author | Zelin Niu Zelin Niu Zelin Niu Zelin Niu Yaqiong Wang Yaqiong Wang Shengyuan Fan Shengyuan Fan |
| author_facet | Zelin Niu Zelin Niu Zelin Niu Zelin Niu Yaqiong Wang Yaqiong Wang Shengyuan Fan Shengyuan Fan |
| author_sort | Zelin Niu |
| collection | DOAJ |
| description | Affected by dip angle and thickness of strata and the tunneling method, soft rock tunnel has obvious characteristics of large deformation, long deformation time and difficult support. Based on a case study of Gelong the deformation and failure mechanism of surrounding rock, stress characteristics of supporting structural and control method of large section highway tunnel passing through strong-medium weathered carbonaceous slate stratum are studied. This paper proposed construction method based on strengthening the longitudinal stiffness of supporting structure and increasing the integrity of surrounding rock, The results showed that the deformation of surrounding rock and the stress of supporting structure increased rapidly in the early stage of construction. The cumulative deformation of vault settlement and horizontal convergence reached 116.9 mm and 97.9 mm, respectively, accounting for 73.53% and 76.62% of the total deformation. The proportion of surrounding rock pressure shared by the primary support and the secondary lining was about 8.9:1.1. This shows that the initial support after comprehensive reinforcement has a strong supporting capacity, and effectively reduces the secondary lining pressure of the tunnel, which plays a vital role in the long-term service of the secondary lining. |
| first_indexed | 2024-04-11T00:07:18Z |
| format | Article |
| id | doaj.art-0b8a9d587b404a76a2584d7c70ab5c14 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-11T00:07:18Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-0b8a9d587b404a76a2584d7c70ab5c142023-01-09T10:13:12ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-01-011010.3389/feart.2022.10943251094325Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slateZelin Niu0Zelin Niu1Zelin Niu2Zelin Niu3Yaqiong Wang4Yaqiong Wang5Shengyuan Fan6Shengyuan Fan7School of Civil Engineering, Xi’an University of Architecture and Technology, Xi an, ChinaShaanxi Key Lab of Geotechnical and Underground Space Engineering, Xi’an, ChinaXAUAT Engineering Technology Co., Ltd., Xi’an, ChinaShaanxi Provincial Major Laboratory for Highway Bridge and Tunnel, Xi’an, ChinaShaanxi Provincial Major Laboratory for Highway Bridge and Tunnel, Xi’an, ChinaSchool of Highway, Chang’an University, Xi’an, ChinaSchool of Civil Engineering, Xi’an University of Architecture and Technology, Xi an, ChinaShaanxi Key Lab of Geotechnical and Underground Space Engineering, Xi’an, ChinaAffected by dip angle and thickness of strata and the tunneling method, soft rock tunnel has obvious characteristics of large deformation, long deformation time and difficult support. Based on a case study of Gelong the deformation and failure mechanism of surrounding rock, stress characteristics of supporting structural and control method of large section highway tunnel passing through strong-medium weathered carbonaceous slate stratum are studied. This paper proposed construction method based on strengthening the longitudinal stiffness of supporting structure and increasing the integrity of surrounding rock, The results showed that the deformation of surrounding rock and the stress of supporting structure increased rapidly in the early stage of construction. The cumulative deformation of vault settlement and horizontal convergence reached 116.9 mm and 97.9 mm, respectively, accounting for 73.53% and 76.62% of the total deformation. The proportion of surrounding rock pressure shared by the primary support and the secondary lining was about 8.9:1.1. This shows that the initial support after comprehensive reinforcement has a strong supporting capacity, and effectively reduces the secondary lining pressure of the tunnel, which plays a vital role in the long-term service of the secondary lining.https://www.frontiersin.org/articles/10.3389/feart.2022.1094325/fulllarge-section highway tunnelhighly-weakly weathered slatecomprehensive reinforcement CD method with integrated reinforcementdeformation controlsurrounding rock pressure |
| spellingShingle | Zelin Niu Zelin Niu Zelin Niu Zelin Niu Yaqiong Wang Yaqiong Wang Shengyuan Fan Shengyuan Fan Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate Frontiers in Earth Science large-section highway tunnel highly-weakly weathered slate comprehensive reinforcement CD method with integrated reinforcement deformation control surrounding rock pressure |
| title | Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate |
| title_full | Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate |
| title_fullStr | Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate |
| title_full_unstemmed | Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate |
| title_short | Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate |
| title_sort | research on the deformation control of surrounding rock about large section tunnel in strong medium weathered slate |
| topic | large-section highway tunnel highly-weakly weathered slate comprehensive reinforcement CD method with integrated reinforcement deformation control surrounding rock pressure |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.1094325/full |
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