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隧道建设（中英文） ›› 2021, Vol. 41 ›› Issue (S2): 313-319.DOI: 10.3973/j.issn.2096-4498.2021.S2.040

• 研究与探索 • 上一篇    下一篇

钢拱架锈蚀对海底隧道支护体系力学行为影响分析

张艺腾1, 2， 王明年1, 2, *， 于丽1, 2， 杨恒洪1, 2， 刘轲瑞1, 2   

  1. （1. 西南交通大学 交通隧道工程教育部重点实验室， 四川 成都 610031；2. 西南交通大学土木工程学院， 四川 成都 610031）

  • 出版日期:2021-12-31 发布日期:2022-03-16
  • 作者简介:张艺腾（1992—），男，重庆人，西南交通大学桥梁与隧道工程专业在读博士，主要研究方向为隧道结构耐久性、围岩损伤。E-mail： zytzytlvzq@163.com。*通信作者： 王明年， E-mail： wangmingnian@swjtu.edu.cn。

Influence of Steel Arch Frame Corrosion on Mechanical Behaviors of Tunnel Support System

ZHANG Yiteng1, 2, WANG Mingnian1, 2, *, YU Li1, 2, YANG Henghong1, 2, LIU Kerui1, 2   

  1. (1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
  • Online:2021-12-31 Published:2022-03-16

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摘要： 为探明初期支护中包裹钢拱架锈蚀对隧道支护体系承载力的影响，考虑锈蚀条件下工字钢与混凝土之间黏结滑移退化关系，将其本构引入ANSYS模拟钢拱架锈蚀状态下隧道支护体系受力变化规律。分析表明： 1）钢拱架锈蚀率小于5%的时候，钢拱架自身、喷射混凝土、初期支护与二次衬砌之间接触压力以及二次衬砌混凝土内力变化较小，受锈蚀率的作用不大。2）钢拱架锈蚀率为5%~55%，支护体系的受力行为及安全性变化很大；当锈蚀率达到55%，工字钢与初期支护混凝土之间的黏结完全失效，钢拱架与初期支护混凝土之间的整体受力功能完全丧失。3）随着钢拱架锈蚀率增加，围岩荷载逐渐向二次衬砌转移，二次衬砌逐渐取代初期支护而成为围岩荷载的主要承担者。

关键词: 海底隧道, 钢拱架锈蚀, 喷射混凝土, 黏结滑移退化, 支护体系安全

Abstract: To investigate the corrosion effect of wrapped steel arch frames in the primary support on the mechanical behaviors of the tunnel support system, the bondslip degradation relationship between Ishaped steel and concrete under the corrosion condition is considered, and its constitutive relationship is introduced into ANSYS to simulate the force change law of the tunnel support system under the corrosion condition of steel arch frames. The analytical results show that: (1) When the corrosion rate of steel arch frame is less than 5%, the internal force of steel arch frame, sprayed concrete, secondary lining concrete, and the contact pressure between the primary support and secondary lining change less and are not affected by the corrosion rate. (2) When the corrosion rate of steel arch is 5%~55%, the force behavior and safety of the support system changes greatly. When the corrosion rate reaches 55%, the bond between steel arch frame and sprayed concrete completely fails and the overall forcebearing function between steel arch frame and primary support concrete is completely lost. (3) As the corrosion rate of steel arch frame increases, the surrounding rock load is gradually transferred to the secondary lining, and the secondary lining gradually replaces the primary support and becomes the main bearer of the surrounding rock load.

Key words: subsea tunnel, steel arch frame corrosion, sprayed concrete, bondslip degradation model, support system safety

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