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Arch foot stability for a large-span metro station crossing a fault fracture zone by the arch cover method

Arch foot stability for a large-span metro station crossing a fault fracture zone by the arch... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Geotechnica Springer Journals

Arch foot stability for a large-span metro station crossing a fault fracture zone by the arch cover method

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References (40)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
1861-1125
eISSN
1861-1133
DOI
10.1007/s11440-023-01928-y
Publisher site
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Abstract

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.

Journal

Acta Geotechnica – Springer Journals

Published: Jan 1, 2024

Keywords: Arch foot stability; Arch cover method; Fault fracture zone; Large-span metro station

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