Monitoring of Tunnel Second Lining and Steel Lining by Using Fiber Bragg Grating Strain Sensor

Abstract:

Dong Yang Tunnel is located in the low mountains and hilly areas with tectonic denudation, where the tunnel of K147+535~K147+575 passes mainly through the maroon and purple red completely weathered mudstone. A differential fiber Bragg grating strain sensor is developed for monitoring the surface strain of tunnel lining. By converting the strain of gauge rod into the strain of beam, two fiber Bragg gratings are separately mounted on the top and bottom surfaces of beam, and as a result shifts its Bragg wavelength. The difference of relative Bragg wavelength shifts of the sensing gratings is 1.05×10^-6 /. Grating sensors are installed on the tunnel lining of K147+540~K147+610. Especially, the second lining of K147+592~K147+598 is enhanced by the steel plate. The strains of >100 occur on the lining of K147+560 and K147+590 in the reinforcing period of 20 days. Following a 160 days operation period, the measurement results indicate that the tunnel structures are gradually tending towards stability.

• Periodical: Applied Mechanics and Materials (Volume 330)
• Pages: 479-484
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.330.479
• Online since: June 2013
• Authors: Ying Na Li, Xiao Yong Cao, Tao Xie, Zhen Gang Zhao, Ya Ping Zhou, Chuan Li, Hao Liu, Jian Kun Su, Zhi Lin Zhang, Li Ming Li
• Keywords: Bragg Wavelength, Fiber Bragg Grating Strain Sensor, Pressure, Second Lining, Steel Lining, Tunnel Collapse

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