Optical fibre strain measurement for tunnel lining monitoring
Optical fibre strain measurement for tunnel lining monitoring
复制标题
DOI：
10.1680/geng.2010.163.3.119
复制
发表时间：
2010-06-01
影响因子：
2.2
通讯作者：
Wright, P.
中科院分区：
文献类型：
--
作者：
Cheung, L. L. K.;Soga, K.;Wright, P.
建立了一个基于布里渊光时域反射技术的应变监测系统，用于监测伦敦某既有隧道混凝土衬砌中的接缝位移。BOTDR应变传感器系统允许使用反射技术测量沿光纤沿着的应变分布，仅需要访问光纤的一端。通过沿隧道衬砌沿着安装的应变传感光纤获得测量结果。通过测量沿着纤维穿过节段关节的应变来捕获关节运动。结果表明，由BOTDR应变传感器系统和传统的振弦式应变计评估的关节运动之间有很好的协议。传统的应变测量仪监测离散位置的应变变化，而BOTDR应变传感器可以提供隧道衬砌的连续应变分布。结果表明，使用BOTDR应变传感系统监测隧道衬砌移动的实用性。
A trial strain-monitoring system using Brillouin optical time-domain reflectometry (BOTDR) technology was set up to monitor joint movements in the concrete tunnel lining in an existing London Underground tunnel. The BOTDR strain sensor system allows the measurement of strain distribution along an optical fibre using the reflective technique, requiring access to only one end of the fibre. Measurements were obtained by a strain-sensing optical fibre installed along the tunnel lining. The joint movements were captured by measuring the strain along the fibre across the segment joints. The results show that there is good agreement between the joint movements evaluated by the BOTDR strain sensor system and those by conventional vibrating-wire strain gauges. Whereas conventional strain measurement gauges monitor the strain variations at discrete locations, a BOTDR strain sensor can provide a continuous strain distribution of the tunnel lining. The results demonstrate the practicality of using the BOTDR strain-sensing system to monitor the movement of tunnel linings.