Research on the Bearing Characteristics of Folding Steel Arch Frames with Different Snap-Fit Types Based on the Compensation Excavation Concept
As the core technology for mechanized installation of tunnel folding steel arch frames, snap-fit connection optimization proves critical in enhancing the load-bearing efficiency of support systems and addressing surrounding rock deformation and instability caused by excavation-induced stress redistr...
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| Language: | English |
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MDPI AG
2025-04-01
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| Online Access: | https://www.mdpi.com/2075-5309/15/9/1423 |
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| author | Shaohua Li Changfu Huang Xiaojie Yang Zhigang Tao Jiaqi Guo Humin Li Tiejun Yao Jie Hu |
| author_facet | Shaohua Li Changfu Huang Xiaojie Yang Zhigang Tao Jiaqi Guo Humin Li Tiejun Yao Jie Hu |
| author_sort | Shaohua Li |
| collection | DOAJ |
| description | As the core technology for mechanized installation of tunnel folding steel arch frames, snap-fit connection optimization proves critical in enhancing the load-bearing efficiency of support systems and addressing surrounding rock deformation and instability caused by excavation-induced stress redistribution. Addressing the theoretical gaps in existing research regarding snap-fit selection mechanisms and quantitative evaluation criteria, this study adopts a combined approach of numerical simulation and field monitoring verification based on the excavation compensation concept to systematically investigate the load-bearing characteristics of folding steel arch frames with different snap-fit configurations. Key findings include (1) identification of 20 mm as the optimal joint diameter, where the vertical displacements of Type A and B snap-fit connections reached their minimum values of 43.1 mm and 39.2 mm, respectively; (2) demonstration of significant geometric configuration effects on principal stress distribution, with Type B connections exhibiting 4.5% lower maximum principal stress compared to Type A, effectively mitigating stress concentration; and (3) field monitoring data verification, revealing that Type B connections achieved 15.8% lower stress values than Type A at critical crown sections, satisfying yield strength requirements while demonstrating enhanced resistance to surrounding rock deformation induced by excavation-induced geostress redistribution. These results confirm Type B snap-fit connections as superior structural solutions for folding steel arch frames, thereby facilitating the advancement of mechanized installation technology for tunnel steel arch frames. |
| format | Article |
| id | doaj-art-650b419edef34640ae812d6f58cc4062 |
| institution | OA Journals |
| issn | 2075-5309 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
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| series | Buildings |
| spelling | doaj-art-650b419edef34640ae812d6f58cc40622025-08-20T02:24:47ZengMDPI AGBuildings2075-53092025-04-01159142310.3390/buildings15091423Research on the Bearing Characteristics of Folding Steel Arch Frames with Different Snap-Fit Types Based on the Compensation Excavation ConceptShaohua Li0Changfu Huang1Xiaojie Yang2Zhigang Tao3Jiaqi Guo4Humin Li5Tiejun Yao6Jie Hu7China Railway 15th Bureau Group Co., Ltd., Shanghai 200070, ChinaChina Railway 15th Bureau Group Co., Ltd., Shanghai 200070, ChinaState Key Laboratory for Tunnel Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaState Key Laboratory for Tunnel Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaSchool of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaChina Railway 15th Bureau Group Co., Ltd., Shanghai 200070, ChinaChina Railway 15th Bureau Group Co., Ltd., Shanghai 200070, ChinaState Key Laboratory for Tunnel Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaAs the core technology for mechanized installation of tunnel folding steel arch frames, snap-fit connection optimization proves critical in enhancing the load-bearing efficiency of support systems and addressing surrounding rock deformation and instability caused by excavation-induced stress redistribution. Addressing the theoretical gaps in existing research regarding snap-fit selection mechanisms and quantitative evaluation criteria, this study adopts a combined approach of numerical simulation and field monitoring verification based on the excavation compensation concept to systematically investigate the load-bearing characteristics of folding steel arch frames with different snap-fit configurations. Key findings include (1) identification of 20 mm as the optimal joint diameter, where the vertical displacements of Type A and B snap-fit connections reached their minimum values of 43.1 mm and 39.2 mm, respectively; (2) demonstration of significant geometric configuration effects on principal stress distribution, with Type B connections exhibiting 4.5% lower maximum principal stress compared to Type A, effectively mitigating stress concentration; and (3) field monitoring data verification, revealing that Type B connections achieved 15.8% lower stress values than Type A at critical crown sections, satisfying yield strength requirements while demonstrating enhanced resistance to surrounding rock deformation induced by excavation-induced geostress redistribution. These results confirm Type B snap-fit connections as superior structural solutions for folding steel arch frames, thereby facilitating the advancement of mechanized installation technology for tunnel steel arch frames.https://www.mdpi.com/2075-5309/15/9/1423bearing characteristicsexcavation compensationfolding steel arch framejoint diametersnap-fit connection |
| spellingShingle | Shaohua Li Changfu Huang Xiaojie Yang Zhigang Tao Jiaqi Guo Humin Li Tiejun Yao Jie Hu Research on the Bearing Characteristics of Folding Steel Arch Frames with Different Snap-Fit Types Based on the Compensation Excavation Concept Buildings bearing characteristics excavation compensation folding steel arch frame joint diameter snap-fit connection |
| title | Research on the Bearing Characteristics of Folding Steel Arch Frames with Different Snap-Fit Types Based on the Compensation Excavation Concept |
| title_full | Research on the Bearing Characteristics of Folding Steel Arch Frames with Different Snap-Fit Types Based on the Compensation Excavation Concept |
| title_fullStr | Research on the Bearing Characteristics of Folding Steel Arch Frames with Different Snap-Fit Types Based on the Compensation Excavation Concept |
| title_full_unstemmed | Research on the Bearing Characteristics of Folding Steel Arch Frames with Different Snap-Fit Types Based on the Compensation Excavation Concept |
| title_short | Research on the Bearing Characteristics of Folding Steel Arch Frames with Different Snap-Fit Types Based on the Compensation Excavation Concept |
| title_sort | research on the bearing characteristics of folding steel arch frames with different snap fit types based on the compensation excavation concept |
| topic | bearing characteristics excavation compensation folding steel arch frame joint diameter snap-fit connection |
| url | https://www.mdpi.com/2075-5309/15/9/1423 |
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