You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    Volume 48, Issue 4 (July 2020)

    New Method of Monitoring Tunnel Feet-Lock Pipe (TFP) Mechanics Using Fiber Bragg Grating (FBG)

    (Received 20 June 2017; accepted 1 June 2018)

    Published Online: 2018

    CODEN: JTEVAB

      Format Pages Price  
    PDF (2.47 MB) 18 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    Tunnel feet-lock pipe (TFP) is one of the most effective measures used to control tunnel settlement and is widely used in tunneling with soft ground or weak rock mass. Mechanical analysis is an important method to optimize TFP design and construction, and its results can be used to evaluate the structural stability of the tunnel. Although the traditional direct resistance method (DRM) can measure the mechanics of TFP, it is not suitable for harsh environments (humid environments, chemical etching, and electromagnetic field noise) or long-term monitoring. In this article, a method to measure the mechanics of TFP by using Fiber Bragg grating (FBG) is proposed. The strain and bending of TFP monitored by FBG is used to analyze the mechanics of TFP. In order to verify the feasibility and accuracy of the FBG method to measure the mechanics of TFP, an experimental scheme was designed to compare DRM and theoretical analysis. A supporting device and loading device were developed for the experimental scheme. Compared with the theoretical value, the error of strain and bending measured by FBG was stable within 5 μϵ, the error of strain measured by DRM was approximately 15 μϵ or even 20–30 μϵ, and the error of bending measured by DRM was 10–15 μϵ or even 25 μϵ. Therefore, the precision of measuring the mechanics of TFP by using FBG is higher than by using DRM.

    Author Information:

    Luo, Yanbin
    School of Highway, Chang’an University, Xi’an, Shaanxi Province

    Diao, Pengsheng
    China State Construction International Investments (China) Ltd., Shenzhen,

    Chen, Jianxun
    School of Highway, Chang’an University, Xi’an, Shaanxi Province

    Li, Dong
    Power China Road Bridge Group Co., Ltd., Beijing,

    Guo, Yalong
    School of Highway, Chang’an University, Xi’an, Shaanxi Province

    Qiao, Xiong
    School of Civil Engineering, Lanzhou University of Technology, Gansu,


    Stock #: JTE20170364

    ISSN:0090-3973

    DOI: 10.1520/JTE20170364

    Author
    Title New Method of Monitoring Tunnel Feet-Lock Pipe (TFP) Mechanics Using Fiber Bragg Grating (FBG)
    Symposium ,
    Committee A04