Monitoring of Tunnel Second Lining and Steel Lining by using Fiber Bragg Grating Strain Sensor
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 ofK147+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.
Fiber Bragg grating strain sensor Bragg wavelength tunnel collapse pressure second lining and steel lining
Yingna Li Liming Li Xiaoyong Cao Tao Xie Zhengang Zhao Yaping Zhou Chuan Li Hao Liu Jian kun Su Zhilin Zhang
Faculty of Information Engineering and Automation, Faculty of Electric Power Engineering,Kunming Uni Yunnan Aerospace Engineering Geophysical Exploration Co.Ltd, Kunming City 650217, China
国际会议
济南
英文
479-484
2013-05-18（万方平台首次上网日期，不代表论文的发表时间）