Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Arch foot stability for a large-span metro station crossing a fault fracture zone by the arch cover method
https://orcid.org/http://orcid.org/0000-0001-7416-7709
The risk of arch foot instability arises in the application of the arch cover method when the surrounding rock is weak. To expand the application of this method, countermeasures are proposed, and construction feasibility is analyzed through a load–structure interaction model, a 3D numerical model, and monitoring data. A parametric analysis is performed to examine the influence of geological conditions and reinforcement parameters. Results indicate that the deformations of the support system decrease in a negative exponential form with the increase in the arch foot expansion coefficient, pile diameter, and prestress. The stress decrement is small when the arch foot expansion coefficient is 2.0. If the arch cover method is used for construction, the geological strength index of rock mass should be more than 45. When a metro station that crosses through a fault fracture zone is constructed by the arch cover method, the countermeasure design process must check whether the bearing capacity of the surrounding rock below the arch foot exceeds the stress state. If this condition does not exist, then checking should be performed again by considering the grouting reinforcement. If this condition that considers the grouting reinforcement holds, other reasonable arch foot reinforcement parameters should be applied, or the excavation method should be changed.
Arch foot stability for a large-span metro station crossing a fault fracture zone by the arch cover method
https://orcid.org/http://orcid.org/0000-0001-7416-7709
The risk of arch foot instability arises in the application of the arch cover method when the surrounding rock is weak. To expand the application of this method, countermeasures are proposed, and construction feasibility is analyzed through a load–structure interaction model, a 3D numerical model, and monitoring data. A parametric analysis is performed to examine the influence of geological conditions and reinforcement parameters. Results indicate that the deformations of the support system decrease in a negative exponential form with the increase in the arch foot expansion coefficient, pile diameter, and prestress. The stress decrement is small when the arch foot expansion coefficient is 2.0. If the arch cover method is used for construction, the geological strength index of rock mass should be more than 45. When a metro station that crosses through a fault fracture zone is constructed by the arch cover method, the countermeasure design process must check whether the bearing capacity of the surrounding rock below the arch foot exceeds the stress state. If this condition does not exist, then checking should be performed again by considering the grouting reinforcement. If this condition that considers the grouting reinforcement holds, other reasonable arch foot reinforcement parameters should be applied, or the excavation method should be changed.
Arch foot stability for a large-span metro station crossing a fault fracture zone by the arch cover method
https://orcid.org/http://orcid.org/0000-0001-7416-7709
The risk of arch foot instability arises in the application of the arch cover method when the surrounding rock is weak. To expand the application of this method, countermeasures are proposed, and construction feasibility is analyzed through a load–structure interaction model, a 3D numerical model, and monitoring data. A parametric analysis is performed to examine the influence of geological conditions and reinforcement parameters. Results indicate that the deformations of the support system decrease in a negative exponential form with the increase in the arch foot expansion coefficient, pile diameter, and prestress. The stress decrement is small when the arch foot expansion coefficient is 2.0. If the arch cover method is used for construction, the geological strength index of rock mass should be more than 45. When a metro station that crosses through a fault fracture zone is constructed by the arch cover method, the countermeasure design process must check whether the bearing capacity of the surrounding rock below the arch foot exceeds the stress state. If this condition does not exist, then checking should be performed again by considering the grouting reinforcement. If this condition that considers the grouting reinforcement holds, other reasonable arch foot reinforcement parameters should be applied, or the excavation method should be changed.
Arch foot stability for a large-span metro station crossing a fault fracture zone by the arch cover method
Acta Geotech.
Zhao, Chenyang (Autor:in) / Lei, Mingfeng (Autor:in) / Shi, Chenghua (Autor:in) / Jia, Chaojun (Autor:in) / Deng, E. (Autor:in) / Zheng, Keyue (Autor:in)
Acta Geotechnica ; 19 ; 379-400
01.01.2024
22 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Arch foot stability , Arch cover method , Fault fracture zone , Large-span metro station 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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