基于BOTDR的隧道应变监测与数值模拟  

Tunnel strain monitoring and numerical simulation based on BOTDR

作　　者：邱海涛[1] 李川[2] 刘建平[3] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]昆明理工大学信息与自动化学院,云南昆明650093 [3]昆明理工大学人事处,云南昆明650093

出　　处：《传感器与微系统》2011年第12期78-81,共4页Transducer and Microsystem Technologies

基　　金：国家自然基金重点基金资助项目(51034001)

摘　　要：基于布里渊散射原理的布里渊光时域反射计(BOTDR)是一种新型的光纤传感器。在介绍该项技术工作原理的基础上,以西南某隧道为实例,采用三维快速拉格朗日法,获得了隧道二次衬砌中应力和位移的分布规律,提出了隧道光纤的铺设方案、粘贴方式及安装工艺。讨论了一天内最大温差对应变监测结果的影响,并在不同时期对隧道内纵向光纤线路和某个绕拱线路的应变监测结果进行了分析。研究结果表明:BOTDR可以比较真实地得到隧道的应变,将其应用于隧道变形监测中是可行有效的。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（3 D-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.

关 键 词：布里渊光时域反射计 光纤 隧道 数值模拟 应变 分布式监测 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]