复合材料科学与工程 ›› 2023, Vol. 0 ›› Issue (5): 71-79.DOI: 10.19936/j.cnki.2096-8000.20230528.011

• 应用研究 • 上一篇    下一篇

钢-FRP复合约束混凝土隧道衬砌管片力学性能试验研究

毕经龙1, 程实1,2*   

  1. 1.煤炭科学研究总院 建井研究分院,北京 100013;
    2.中煤科工集团北京华宇工程有限公司,北京 100120
  • 收稿日期:2023-01-13 出版日期:2023-05-28 发布日期:2023-08-22
  • 通讯作者: 程实(1987—),男,博士,研究员,硕士生导师,研究方向为组合结构及新型材料结构受力性能研究,cs8781@163.com。
  • 作者简介:毕经龙(1997—),男,硕士生,研究方向为新材料结构及新型组合结构理论与技术。
  • 基金资助:
    国家自然科学基金(52178217)

Experimental study on behavior of the MCSCFC tunnel lining segment

BI Jinglong1, CHENG Shi1,2*   

  1. 1. Research Institute of Mine Construction, China Coal Research Institute, Beijing 100013, China;
    2. Beijing Huayu Engineering Co., Ltd., China Coal Technology Engineering Group, Beijing 100120, China
  • Received:2023-01-13 Online:2023-05-28 Published:2023-08-22

摘要: 提出了一种新型隧道衬砌管片——钢-FRP复合约束混凝土(Multi-Cell steel tube-Sandwich Concrete-FRP tube-Core concrete,MCSCFC)管片。MCSCFC管片由以下四个部分组成:多腔方钢管、夹层混凝土、纤维增强复合材料(FRP)管、核心混凝土。为研究均匀围压状态下MCSCFC管片与传统钢筋混凝土(Reinforced Concrete,RC)管片力学性能的差异,本文以FRP管厚度为变量,共设计制作了4个管片模型试件(3个MCSCFC管片,1个RC管片),随后对4个管片模型试件开展均匀围压状态下的力学性能试验研究,分析试件的破坏模式、荷载-位移关系以及荷载-应变响应。研究结果表明:①MCSCFC管片表现出明显的屈服后硬化行为;②相比RC管片,MCSCFC管片在厚度减薄39.4%的情况下,极限承载力提升41.8%。

关键词: 管片, 约束混凝土, FRP管, 屈服后硬化

Abstract: A novel tunnel lining and segment i.e. the multi-cell steel tube-sandwich concrete-fibre reinforced polymer (FRP) tube-core concrete (MCSCFC) segment was proposed. The MCSCFC segment comprised the following four parts: multi-cell square steel tube; concrete between FRP tubes and square steel tube walls; FRP tubes placed in cells; core concrete confined by FRP tubes. To understand mechanical behaviors of the MCSCFC and conventional reinforced concrete (RC) segments under the lateral uniform compression, the 4 segment model specimens (3 MCSCFC and 1 RC) with different thicknesses of FRP tubes were tested under the lateral uniform compression. The failure modes, load-displacement and load-strain curves of segment model specimens were analysed and discussed. Experimental investigation-based conclusions were drawn: ①The MCSCFC segments exhibit distinctive post-yield hardening behaviour under the lateral uniform compression; ②compared to that of the RC segment, the bearing capacity of MCSCFC segment increased up to 41.8% when the segment thickness was reduced by 39.4%.

Key words: segment, confined concrete, FRP tube, post-yield hardening

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