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Volume 59 Issue 1
Jan.  2024
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Journal of Southwest Jiaotong University  > 2024  >  59(1): 11-19.
LI Jinhui, ZHANG Junqi, WEI Qiang, JIA Dapeng, GUO Dong, BAI Shi, OU Jinping. Loose Zone Identification for Surrounding Rock of Tunnels Using Self-Sensing Fiber Reinforced Plastic Anchors[J]. Journal of Southwest Jiaotong University, 2024, 59(1): 11-19. doi: 10.3969/j.issn.0258-2724.20220003
Citation: LI Jinhui, ZHANG Junqi, WEI Qiang, JIA Dapeng, GUO Dong, BAI Shi, OU Jinping. Loose Zone Identification for Surrounding Rock of Tunnels Using Self-Sensing Fiber Reinforced Plastic Anchors[J]. Journal of Southwest Jiaotong University, 2024, 59(1): 11-19. doi: 10.3969/j.issn.0258-2724.20220003
shu

Loose Zone Identification for Surrounding Rock of Tunnels Using Self-Sensing Fiber Reinforced Plastic Anchors

doi: 10.3969/j.issn.0258-2724.20220003
  • 1.

    Shenzhen Key Laboratory of Intelligent Structure System in Civil Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China

  • 2.

    China State Railway Group Co., Ltd., Beijing 100844, China

  • 3.

    Zhixing FRP Reinforcement Nantong Co., Ltd., Nantong 226010, China

  • Received Date: 01 Jan 2022
  • Rev Recd Date: 28 Apr 2022
    • Available Online: 13 Sep 2023
  • Publish Date: 23 May 2022
    Abstract

  • The deformation of the tunnel surrounding rock and the thickness of the loose zone are important considerations for tunnel structure design and an important reference basis for safe operation. However, the existing identification methods of the loose zone and measurement methods of tunnel surrounding rock deformation are mostly at the detection level, and long-term and real-time monitoring methods are inadequate. In this paper, a self-sensing fiber reinforced plastic (FRP) anchor embedded with optical fiber was developed, and an intelligent monitoring system for the tunnel surrounding rock based on the self-sensing FRP anchor embedded with optical fiber was proposed. The monitoring system can realize three-dimensional, round-the-clock, and real-time monitoring of surrounding rock deformation. Based on the monitoring data and theoretical analysis, a method to identify the loose zone of the tunnel surrounding rock was proposed. The intelligent monitoring method was applied to the Chentang tunnel in Guangzhou−shantou high-speed railway for the first time. The results show that the self-sensing FRP anchor can accurately detect the influence of field construction on surrounding rock deformation, and the steel frame has a prominent supporting effect on the tunnel surrounding rock. The monitoring data can reflect the force law of the self-sensing anchor in real time, so as to accurately determine the thickness of the loose zone of surrounding rock at different positions of the tunnel. The intelligent tunnel surrounding rock monitoring system based on the self-sensing FRP anchor will continuously and timely monitor the deformation of tunnel surrounding rock during the tunnel operation and provide a high-tech guarantee for the safety of the tunnel structure during the full life cycle.

     

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