Construction Mechanical Characteristics of Shallow Karst Stratum Cavity and Subway Tunnel under Different Position Relationships
［Objective］ The relationship between the cavity and the newly built tunnel is complex, and the cavity in the surrounding rock of the subway tunnel can affect the construction inside the tunnel and the safety of the ground environment. Therefore, it is necessary to explore the influence of different...
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Urban Mass Transit Magazine Press
2025-04-01
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| Series: | Chengshi guidao jiaotong yanjiu |
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| Online Access: | https://umt1998.tongji.edu.cn/journal/paper/doi/10.16037/j.1007-869x.2025.04.023.html |
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| author | CHEN Jun HE Xuhu WANG Xiang GU Wenjun CHEN Bing WANG Shimin |
| author_facet | CHEN Jun HE Xuhu WANG Xiang GU Wenjun CHEN Bing WANG Shimin |
| author_sort | CHEN Jun |
| collection | DOAJ |
| description | ［Objective］ The relationship between the cavity and the newly built tunnel is complex, and the cavity in the surrounding rock of the subway tunnel can affect the construction inside the tunnel and the safety of the ground environment. Therefore, it is necessary to explore the influence of different positional relationships between the cavity and the tunnel on mechanical characteristics of the subway tunnel construction. ［Method］ A numerical model is established using ANSYS finite element software to analyze tunnel peripheral displacement, initial support stress, cavity displacement, cavity stress, and land subsidence. ［Result & Conclusion］ The formation of a cavity may change the original stratum stress field, and the stratum stress in a certain range around the cavity will be released. The stress law of the initial support structure after tunnel excavation is basically the same at different cavity locations, and the existence of the cavity does not significantly change the final stress of the initial support structure. In terms of the maximum displacement difference from cavity top to bottom, the largest one occurs in the arch bottom cavity condition, followed by the vault cavity condition, and the smallest occurs in arch waist cavity condition. Under the no cavity, vault cavity, arch waist cavity, and arch bottom cavity conditions, the maximum land subsidence are 5.37 mm, 4.24 mm, 4.84 mm, and 4.42 mm, respectively. Cavities at different locations will not affect the overall trend of land subsidence changes. |
| format | Article |
| id | doaj-art-0a38294dfdd74c80987f994bad7577c8 |
| institution | OA Journals |
| issn | 1007-869X |
| language | zho |
| publishDate | 2025-04-01 |
| publisher | Urban Mass Transit Magazine Press |
| record_format | Article |
| series | Chengshi guidao jiaotong yanjiu |
| spelling | doaj-art-0a38294dfdd74c80987f994bad7577c82025-08-20T02:16:10ZzhoUrban Mass Transit Magazine PressChengshi guidao jiaotong yanjiu1007-869X2025-04-0128411912510.16037/j.1007-869x.2025.04.023Construction Mechanical Characteristics of Shallow Karst Stratum Cavity and Subway Tunnel under Different Position RelationshipsCHEN Jun0HE Xuhu1WANG Xiang2GU Wenjun3CHEN Bing4WANG Shimin5Guiyang Public Transport Investment and Operation Group Co., Ltd., 550081, Guiyang, ChinaKey Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, 610031, Chengdu, ChinaGuiyang Public Transport Investment and Operation Group Co., Ltd., 550081, Guiyang, ChinaChina Railway Development and Investment Group Co., Ltd., 650500, Kunming, ChinaKey Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, 610031, Chengdu, ChinaKey Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, 610031, Chengdu, China［Objective］ The relationship between the cavity and the newly built tunnel is complex, and the cavity in the surrounding rock of the subway tunnel can affect the construction inside the tunnel and the safety of the ground environment. Therefore, it is necessary to explore the influence of different positional relationships between the cavity and the tunnel on mechanical characteristics of the subway tunnel construction. ［Method］ A numerical model is established using ANSYS finite element software to analyze tunnel peripheral displacement, initial support stress, cavity displacement, cavity stress, and land subsidence. ［Result & Conclusion］ The formation of a cavity may change the original stratum stress field, and the stratum stress in a certain range around the cavity will be released. The stress law of the initial support structure after tunnel excavation is basically the same at different cavity locations, and the existence of the cavity does not significantly change the final stress of the initial support structure. In terms of the maximum displacement difference from cavity top to bottom, the largest one occurs in the arch bottom cavity condition, followed by the vault cavity condition, and the smallest occurs in arch waist cavity condition. Under the no cavity, vault cavity, arch waist cavity, and arch bottom cavity conditions, the maximum land subsidence are 5.37 mm, 4.24 mm, 4.84 mm, and 4.42 mm, respectively. Cavities at different locations will not affect the overall trend of land subsidence changes.https://umt1998.tongji.edu.cn/journal/paper/doi/10.16037/j.1007-869x.2025.04.023.htmlsubwaytunnelconstruction mechanical characteristicsshallow karst stratumcavity locationconcealed karst cave |
| spellingShingle | CHEN Jun HE Xuhu WANG Xiang GU Wenjun CHEN Bing WANG Shimin Construction Mechanical Characteristics of Shallow Karst Stratum Cavity and Subway Tunnel under Different Position Relationships Chengshi guidao jiaotong yanjiu subway tunnel construction mechanical characteristics shallow karst stratum cavity location concealed karst cave |
| title | Construction Mechanical Characteristics of Shallow Karst Stratum Cavity and Subway Tunnel under Different Position Relationships |
| title_full | Construction Mechanical Characteristics of Shallow Karst Stratum Cavity and Subway Tunnel under Different Position Relationships |
| title_fullStr | Construction Mechanical Characteristics of Shallow Karst Stratum Cavity and Subway Tunnel under Different Position Relationships |
| title_full_unstemmed | Construction Mechanical Characteristics of Shallow Karst Stratum Cavity and Subway Tunnel under Different Position Relationships |
| title_short | Construction Mechanical Characteristics of Shallow Karst Stratum Cavity and Subway Tunnel under Different Position Relationships |
| title_sort | construction mechanical characteristics of shallow karst stratum cavity and subway tunnel under different position relationships |
| topic | subway tunnel construction mechanical characteristics shallow karst stratum cavity location concealed karst cave |
| url | https://umt1998.tongji.edu.cn/journal/paper/doi/10.16037/j.1007-869x.2025.04.023.html |
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