Experimental tests and theoretical analysis for mechanical behaviors of side wall opening construction in mined excavation subway station
The connection of subway stations to surrounding underground spaces inevitably involves opening construction in the existing underground structure. The opening construction can strongly impact the existing underground structure when there is no reserved condition. In this study, three-dimensional nu...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-02-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2023.1127078/full |
| _version_ | 1797937940944388096 |
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| author | Zhinan Hu Hongtao Mao Lixin Zhang Zhichun Liu |
| author_facet | Zhinan Hu Hongtao Mao Lixin Zhang Zhichun Liu |
| author_sort | Zhinan Hu |
| collection | DOAJ |
| description | The connection of subway stations to surrounding underground spaces inevitably involves opening construction in the existing underground structure. The opening construction can strongly impact the existing underground structure when there is no reserved condition. In this study, three-dimensional numerical simulation, model test, and theoretical analysis are used to analyze the mechanical behaviors of side wall opening construction in a mined excavation subway station-Xuanwumen Station of Beijing Subway Line 4. Based on the deformation and stress characteristics of the existing side wall structure, two different reinforcement measures are compared. It is found that the vertical and horizontal deformations of the existing structure caused by opening construction is −1.58 and −1.79 mm, respectively, which are lower than the subway deformation control requirements (3 mm). However, the first and third principal stress increments are 2.14 and −4.62 MPa, respectively, which are markedly higher than the control requirement (10%). A “two-step opening” method is proposed for side wall opening construction in underground structures based on the solution of complex function to the orifice problem. This theoretical method is validated by numerical simulations and model tests, achieving highly consistent results. The allowable ultimate span of side wall opening is 5.75 m without reinforcement. Findings of the present study provide a reference for the design and construction of side wall openings in similar underground spaces. |
| first_indexed | 2024-04-10T18:52:06Z |
| format | Article |
| id | doaj.art-07db70b89f044cffbbaf7e5011e82981 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-10T18:52:06Z |
| publishDate | 2023-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-07db70b89f044cffbbaf7e5011e829812023-02-01T05:43:37ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-02-011110.3389/feart.2023.11270781127078Experimental tests and theoretical analysis for mechanical behaviors of side wall opening construction in mined excavation subway stationZhinan Hu0Hongtao Mao1Lixin Zhang2Zhichun Liu3State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, ChinaState Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, ChinaShijiazhuang State-owned Capital Investment and Operation Group Co, Ltd., Shijiazhuang, ChinaState Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, ChinaThe connection of subway stations to surrounding underground spaces inevitably involves opening construction in the existing underground structure. The opening construction can strongly impact the existing underground structure when there is no reserved condition. In this study, three-dimensional numerical simulation, model test, and theoretical analysis are used to analyze the mechanical behaviors of side wall opening construction in a mined excavation subway station-Xuanwumen Station of Beijing Subway Line 4. Based on the deformation and stress characteristics of the existing side wall structure, two different reinforcement measures are compared. It is found that the vertical and horizontal deformations of the existing structure caused by opening construction is −1.58 and −1.79 mm, respectively, which are lower than the subway deformation control requirements (3 mm). However, the first and third principal stress increments are 2.14 and −4.62 MPa, respectively, which are markedly higher than the control requirement (10%). A “two-step opening” method is proposed for side wall opening construction in underground structures based on the solution of complex function to the orifice problem. This theoretical method is validated by numerical simulations and model tests, achieving highly consistent results. The allowable ultimate span of side wall opening is 5.75 m without reinforcement. Findings of the present study provide a reference for the design and construction of side wall openings in similar underground spaces.https://www.frontiersin.org/articles/10.3389/feart.2023.1127078/fullside wall openingstructure demolitionmechanical behaviorstheoretical analysisultimate opening span |
| spellingShingle | Zhinan Hu Hongtao Mao Lixin Zhang Zhichun Liu Experimental tests and theoretical analysis for mechanical behaviors of side wall opening construction in mined excavation subway station Frontiers in Earth Science side wall opening structure demolition mechanical behaviors theoretical analysis ultimate opening span |
| title | Experimental tests and theoretical analysis for mechanical behaviors of side wall opening construction in mined excavation subway station |
| title_full | Experimental tests and theoretical analysis for mechanical behaviors of side wall opening construction in mined excavation subway station |
| title_fullStr | Experimental tests and theoretical analysis for mechanical behaviors of side wall opening construction in mined excavation subway station |
| title_full_unstemmed | Experimental tests and theoretical analysis for mechanical behaviors of side wall opening construction in mined excavation subway station |
| title_short | Experimental tests and theoretical analysis for mechanical behaviors of side wall opening construction in mined excavation subway station |
| title_sort | experimental tests and theoretical analysis for mechanical behaviors of side wall opening construction in mined excavation subway station |
| topic | side wall opening structure demolition mechanical behaviors theoretical analysis ultimate opening span |
| url | https://www.frontiersin.org/articles/10.3389/feart.2023.1127078/full |
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