Safety Monitoring of Railway Tunnel Construction Using FBG Sensing Technology

X.W. Ye 1,2,*, Y.Q. Ni 3 and J.H. Yin 3

1 The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China

2 Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China

3 Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

Advances in Structural Engineering Vol. 16 No. 8 2013

Abstract: In comparison with above-ground structures, the investigation of underground space structures still faces great challenges because of the extremely complicated constitutive relationships of the soils or rocks. Implementation of structural health monitoring (SHM) systems on the underground structures such as tunnels commencing from the construction stage may be of help in understanding their operational behaviors and long-term trends. This paper explores the application of the fiber Bragg grating (FBG) sensing technology for safety monitoring during railway tunnel construction. An FBG-based temperature monitoring system is first developed for real-time temperature measurement of the frozen soils during freezing construction of a metro-tunnel cross-passage. Through in-situ deployment of FBG-based liquid level sensors, the subgrade settlement of a segment of a high-speed rail line is then monitored in an automatic manner during construction of an undercrossing tunnel. The field results indicate that the FBG sensors are robust and reliable in perceiving temperature and strain variations even in harsh environments.

Key words: railway tunnel, construction monitoring, safety evaluation, FBG sensors, temperature, settlement.

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