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Analysis of interaction mechanism between surrounding rock and supporting structures for soft-rock tunnels under high geo-stress
https://orcid.org/http://orcid.org/0000-0002-8652-7561
Due to the extremely complex load distribution form and evolution law of soft-rock tunnels under high geo-stress, there has been a long-term lack of theoretical support for designing supporting structures and preventing large deformation disasters. Therefore, it is significant to explore the interaction between surrounding rock and supporting structures for soft-rock tunnels under a high geo-stress environment. Firstly, the evolution characteristics of the supporting structure load and surrounding rock damage were analyzed using the field measurement and the proposed composite viscoelastic-plastic creep damage model. Then, the load sharing and transfer mechanisms were discussed based on the decreasing evolution process of the bearing capacity after the primary support yields. Furthermore, a theoretical solution method that can reflect this load evolution mechanism was derived by synthesizing elastic–plastic constitutive, creep damage constitutive, and concrete damage constitutive models. The results showed that the load grows with the development of the surrounding rock damage. Hence the surrounding rock damage is an intrinsic factor leading to load growth. If a supporting component yields, the bearing mode will change from cooperative sharing to load transfer. In other words, part of the load originally acting on the yielded component will be transferred to the other unyielded components. During 55 days after the primary support yielded, a total load of 381 kPa was transferred to the secondary lining, accounting for 61.3% of the total load of the secondary lining. Calculation examples showed that the proposed theoretical solution method could reflect the progressive yield process of each supporting component and the load sharing and transfer processes.
Analysis of interaction mechanism between surrounding rock and supporting structures for soft-rock tunnels under high geo-stress
https://orcid.org/http://orcid.org/0000-0002-8652-7561
Due to the extremely complex load distribution form and evolution law of soft-rock tunnels under high geo-stress, there has been a long-term lack of theoretical support for designing supporting structures and preventing large deformation disasters. Therefore, it is significant to explore the interaction between surrounding rock and supporting structures for soft-rock tunnels under a high geo-stress environment. Firstly, the evolution characteristics of the supporting structure load and surrounding rock damage were analyzed using the field measurement and the proposed composite viscoelastic-plastic creep damage model. Then, the load sharing and transfer mechanisms were discussed based on the decreasing evolution process of the bearing capacity after the primary support yields. Furthermore, a theoretical solution method that can reflect this load evolution mechanism was derived by synthesizing elastic–plastic constitutive, creep damage constitutive, and concrete damage constitutive models. The results showed that the load grows with the development of the surrounding rock damage. Hence the surrounding rock damage is an intrinsic factor leading to load growth. If a supporting component yields, the bearing mode will change from cooperative sharing to load transfer. In other words, part of the load originally acting on the yielded component will be transferred to the other unyielded components. During 55 days after the primary support yielded, a total load of 381 kPa was transferred to the secondary lining, accounting for 61.3% of the total load of the secondary lining. Calculation examples showed that the proposed theoretical solution method could reflect the progressive yield process of each supporting component and the load sharing and transfer processes.
Analysis of interaction mechanism between surrounding rock and supporting structures for soft-rock tunnels under high geo-stress
https://orcid.org/http://orcid.org/0000-0002-8652-7561
Due to the extremely complex load distribution form and evolution law of soft-rock tunnels under high geo-stress, there has been a long-term lack of theoretical support for designing supporting structures and preventing large deformation disasters. Therefore, it is significant to explore the interaction between surrounding rock and supporting structures for soft-rock tunnels under a high geo-stress environment. Firstly, the evolution characteristics of the supporting structure load and surrounding rock damage were analyzed using the field measurement and the proposed composite viscoelastic-plastic creep damage model. Then, the load sharing and transfer mechanisms were discussed based on the decreasing evolution process of the bearing capacity after the primary support yields. Furthermore, a theoretical solution method that can reflect this load evolution mechanism was derived by synthesizing elastic–plastic constitutive, creep damage constitutive, and concrete damage constitutive models. The results showed that the load grows with the development of the surrounding rock damage. Hence the surrounding rock damage is an intrinsic factor leading to load growth. If a supporting component yields, the bearing mode will change from cooperative sharing to load transfer. In other words, part of the load originally acting on the yielded component will be transferred to the other unyielded components. During 55 days after the primary support yielded, a total load of 381 kPa was transferred to the secondary lining, accounting for 61.3% of the total load of the secondary lining. Calculation examples showed that the proposed theoretical solution method could reflect the progressive yield process of each supporting component and the load sharing and transfer processes.
Analysis of interaction mechanism between surrounding rock and supporting structures for soft-rock tunnels under high geo-stress
Acta Geotech.
Zhou, Zihan (author) / He, Chuan (author) / Chen, Ziquan (author) / Wang, Bo (author) / Li, Tiansheng (author) / Jiang, Changwei (author)
Acta Geotechnica ; 18 ; 4871-4897
2023-09-01
27 pages
Article (Journal)
Electronic Resource
English
High geo-stress , Load sharing and transfer mechanisms , Soft-rock tunnel , Supporting structures , Tunnel engineering Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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