Real-time condition assessment of railway tunnel deformation using an FBG-based monitoring system

Lu Zhou, Chao Zhang, Yi Qing Ni, Chung Yue Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)


A tunnel deformation monitoring system is developed with the use of fiber Bragg grating (FBG) sensing technique, aiming at providing continuous monitoring of railway tunnel deformation in the long term, and early warning for the rail service maintainers and authorities to avoid catastrophic consequences when significant deformation occurs. Specifically, a set of FBG bending gauges with the ability of angle measurement and temperature compensation is designed and manufactured for the purpose of online monitoring of tunnel deformation. An overall profile of lateral tunnel displacement along the longitudinal direction can be obtained by implementing an array of the FBG bending gauges interconnected by rigid rods, in conjunction with a proper algorithm. The devised system is verified in laboratory experiments with a test setup enabling to imitate various patterns of tunnel deformation before the implementation of this system in an in-service high-speed railway (HSR) tunnel.

Original languageEnglish
Pages (from-to)537-548
Number of pages12
JournalSmart Structures and Systems
Issue number5
Publication statusPublished - May 2018


  • FBG bending gauge array
  • Online monitoring
  • Railway tunnel deformation
  • Temperature compensation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering


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