QIU Hai-tao1, LI Chuan2, LIU Jian-ping3. Tunnel strain monitoring and numerical simulation based on BOTDR[J]. 2011, 30(12): 78-81. DOI: 10.13873/j.1000-97872011.12.013.
The Brilliouin optical time domain reflectometer(BOTDR)is a new type of optical fiber sensor based on Brilliouin scattering principle.The basic principle and features of the BOTDR are introduced
and taking a tunnel located in southwest China for example
the stress and displacement distribution in secondary liner are obtained using three-dimensional fast Lagrangian analysis of continua(3D-FLAC)method.Accordingly the laying scheme
installation technics
adhesive method of optical fiber in tunnel is put forward.In addition
the influence of daylong maximal difference in temperature on the monitoring results is discussed.Finally
the measurement results of the tunnel’s lengthways optical fiber line and some tunnel’s cincturing arch line at different period are analyzed.The results show that the BOTDR is a feasible and effective method for the strain measurement in the tunnel.