Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel

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国家科技期刊平台
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外文摘要：Excavating super-large-span tunnels in soft rock masses presents significant challenges.To ensure safety,the sequential exca-vation method is commonly adopted.It utilizes internal temporary supports to spatially partition the tunnel face and divide the excavation into multiple stages.However,these internal supports generally impose spatial constraints,limiting the use of large-scale excavation equipment and reducing construction efficiency.To address this constraint,this study adopts the"Shed-frame"principle to explore the feasibility of an innovative support system,which aims to replace internal supports with prestressed anchor cables and thus provide a more spacious working space with fewer internal obstructions.To evalu-ate its effectiveness,a field case involving the excavation of a 24-m span tunnel in soft rock is presented,and an analysis of extensive field data is conducted to study the deformation characteristics of the surrounding rock and the mechanical behavior of the support system.The results revealed that prestressed anchor cables integrated the initial support with the shed,creating an effective"shed-frame"system,which successively maintained tunnel deformation and frame stress levels within safe regulatory bounds.Moreover,the prestressed anchor cables bolstered the surrounding rock effectively and reduced the excavation-induced disturbance zone significantly.In summary,the proposed support system balances construction efficiency and safety.These field experiences may offer valuable insights into the popularization and further development of prestressed anchor cable support systems.

外文关键词：

Super-large-span tunnelConstruction safetySequential excavation methodShed-frame principlePrestressed anchor cables

作者：

Shunhua Zhou、Yuyin Jin、Zhiyao Tian、Chunhua Zou、Heming Zhao、Zengrun Miao

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作者单位：

Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety,Tongji University,Shanghai 201804,China

Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University,Shanghai 201804,China

China Railway Construction Corporation Limited,Beijing 100855,China

The 2nd Engineering Co.,Ltd.of China Railway Construction Bridge Engineering Bureau Group,Shenzhen 518083,China

China Railway Construction Bridge Engineering Bureau Group Co.,Ltd,Tianjin 300300,China

China Railway Construction Bridge Engineering Bureau Group Co.,Ltd.,Tianjin 300300,China

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出版年：

2024

DOI：

10.1007/s40534-024-00340-w

铁道工程科学(英文)

西南交通大学

铁道工程科学(英文)

影响因子：0.403

ISSN：2662-4745

年,卷(期)：2024.32(3)