光纤Bragg光栅传感技术在隧道监测中的应用_赵星光.pdf

26 3 Vol.26 No.3 2007 3 Chinese Journal of Rock Mechanics and Engineering March 2007 Bragg 12 (1. 100083 2. 650093) # Bragg (FBG)3 FBG 24 h Bragg Bragg FBG 8 FBG Bragg 3# U 45 A 2007 APPLICATION OF FIBER BRAGG GRATING SENSING TECHNOLOGY TO TUNNEL MONITORING 1 2 ZHAO Xingguang QIU Haitao (1. School of Civil and Environmental EngineeringUniversity of Science and Technology BeijingBeijing100083China 2. Faculty of Land Resource EngineeringKunming University of Science and Technology Kunming Yunnan650093China) Abstract On the basis of introducing the basic principle and advantages of fiber Bragg grating(FBG) sensing technologythe layout schemes of FBG and temperature compensation technology in the Bainijing Tunnel No.3 in Kunming City are put forward. After 24-hour continuous monitoringthe influence of daylong maximal difference in temperature on the changes of the Bragg wavelength is discussed and reliability estimation of the Bragg wavelength obtained by temperature sensing system on each monitoring tunnel cross-section is carried out. The calculation results validate the reliability of the FBG measurement system as a result that the standard errors of the Bragg wavelength are less than 14 pm. Thenthe eight-month strain monitoring data illuminate that alternation of dry season and rainy season as an important factor is the reason in strain fluctuation of monitoring spots and rainy sea