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

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

Abstract

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.

Key Words

railway tunnel deformation; online monitoring; FBG bending gauge array; temperature compensation

Address

Lu Zhou, Chao Zhang and Yi-Qing Ni — Hong Kong Branch of Chinese National Rail Transit Electrification and Automation Engineering Technology Research Center, Hong Kong; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
Chung-Yue Wang — Department of Civil Engineering, National Central University, Taoyuan, Taiwan

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