Study on the influence law of cavities behind the shotcrete lining on the lattice girders
Abstract The field monitoring data showed that a small amount of main reinforcement bars of lattice girder at the arch of a tunnel were pulled, and the calculation showed that the initial support structure should be compressed. To find out the reason for the tension of the main reinforcement, the ge...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-01-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-024-51191-8 |
| _version_ | 1797350003862142976 |
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| author | Chuande Qi Junfeng Liu Chao Zong Weiliang Jiang Weiteng Li Yang Li Jianquan Yan |
| author_facet | Chuande Qi Junfeng Liu Chao Zong Weiliang Jiang Weiteng Li Yang Li Jianquan Yan |
| author_sort | Chuande Qi |
| collection | DOAJ |
| description | Abstract The field monitoring data showed that a small amount of main reinforcement bars of lattice girder at the arch of a tunnel were pulled, and the calculation showed that the initial support structure should be compressed. To find out the reason for the tension of the main reinforcement, the geological radar was used to detect the cavity in the sprayed concrete layer at the tension position. In order to clarify the tension mechanism of the main reinforcement and the influence of factors such as the position and size of the cavity on the main reinforcement, numerical simulations were carried out. The results show that the cavity causes the eccentric compression of the shotcrete layer, resulting in moment of the lattice girder and the change of the stress distribution of the main reinforcement. The main reinforcement experiences tensile stress when the cavity size surpasses 3 m × 0.2 m, reaching a tensile stress of 81 MPa at a cavity size of 6 m × 0.2 m. Notably, the cavity located at the foot of the arch is more likely to produce substantial tensile stress on the primary reinforcement compared to those at the arch crown and waist. The research results provide a theoretical basis for the interpretation and analysis of tunnel lattice girder monitoring data. |
| first_indexed | 2024-03-08T12:38:30Z |
| format | Article |
| id | doaj.art-785b4e5271d44303b03f00d599392bc6 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-08T12:38:30Z |
| publishDate | 2024-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-785b4e5271d44303b03f00d599392bc62024-01-21T12:17:35ZengNature PortfolioScientific Reports2045-23222024-01-0114111210.1038/s41598-024-51191-8Study on the influence law of cavities behind the shotcrete lining on the lattice girdersChuande Qi0Junfeng Liu1Chao Zong2Weiliang Jiang3Weiteng Li4Yang Li5Jianquan Yan6Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention, Shandong University of Science and TechnologyShandong Provincial Key Laboratory of Civil Engineering Disaster Prevention, Shandong University of Science and TechnologyQingdao Metro Group Co. LtdShandong Expressway Infrastructure Construction Co. LtdShandong Provincial Key Laboratory of Civil Engineering Disaster Prevention, Shandong University of Science and TechnologyShandong Provincial Key Laboratory of Civil Engineering Disaster Prevention, Shandong University of Science and TechnologyZibo Traffic Construction Development CenterAbstract The field monitoring data showed that a small amount of main reinforcement bars of lattice girder at the arch of a tunnel were pulled, and the calculation showed that the initial support structure should be compressed. To find out the reason for the tension of the main reinforcement, the geological radar was used to detect the cavity in the sprayed concrete layer at the tension position. In order to clarify the tension mechanism of the main reinforcement and the influence of factors such as the position and size of the cavity on the main reinforcement, numerical simulations were carried out. The results show that the cavity causes the eccentric compression of the shotcrete layer, resulting in moment of the lattice girder and the change of the stress distribution of the main reinforcement. The main reinforcement experiences tensile stress when the cavity size surpasses 3 m × 0.2 m, reaching a tensile stress of 81 MPa at a cavity size of 6 m × 0.2 m. Notably, the cavity located at the foot of the arch is more likely to produce substantial tensile stress on the primary reinforcement compared to those at the arch crown and waist. The research results provide a theoretical basis for the interpretation and analysis of tunnel lattice girder monitoring data.https://doi.org/10.1038/s41598-024-51191-8 |
| spellingShingle | Chuande Qi Junfeng Liu Chao Zong Weiliang Jiang Weiteng Li Yang Li Jianquan Yan Study on the influence law of cavities behind the shotcrete lining on the lattice girders Scientific Reports |
| title | Study on the influence law of cavities behind the shotcrete lining on the lattice girders |
| title_full | Study on the influence law of cavities behind the shotcrete lining on the lattice girders |
| title_fullStr | Study on the influence law of cavities behind the shotcrete lining on the lattice girders |
| title_full_unstemmed | Study on the influence law of cavities behind the shotcrete lining on the lattice girders |
| title_short | Study on the influence law of cavities behind the shotcrete lining on the lattice girders |
| title_sort | study on the influence law of cavities behind the shotcrete lining on the lattice girders |
| url | https://doi.org/10.1038/s41598-024-51191-8 |
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