FBG在隧道施工监测中的应用及关键问题探讨  

Several key problems in tunnel construction monitoring with FBG

作　　者：魏广庆[1] 施斌[1] 胡盛[1] 李科[1] 殷建华[2] 

机构地区：[1]南京大学光电传感监测中心,江苏南京210093 [2]香港理工大学土木工程系,中国香港

出　　处：《岩土工程学报》2009年第4期571-576,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家杰出青年科学基金项目(40225006)

摘　　要：光纤布拉格光栅(FBG)传感技术具有精度高、准分布、实时性、耐腐蚀及抗电磁干扰等独特优势,已在众多工程监测领域中得到应用,但纤细脆弱、交叉敏感的FBG应用到作业环境恶劣和变形规律复杂的隧道工程监测中还有一些关键问题需要解决。探讨了FBG用于在建隧道工程监测中常遇到的封装保护、温度补偿及系统集成问题,提出了相应的解决办法和思路,并以具体工程案例对上述问题进行了分析。研究表明:通过合适的封装和保护可以将埋入式FBG传感器的成活率大幅提高,实现在隧道开挖期间对喷射混凝土的拱架内力、混凝土应变与温度的实时监测。Fiber Bragg grating （FBG） sensor has a number of advantages such as high sensitivity, multiplexing capabilities, fast response, resistance to corrosion, and immunity to electromagnetic noise and radio frequency interference, and has been widely applied in engineering monitoring. The environment of tunnel construction site is usually very severe and harsh, whereas the unprotected FBG sensor is very vulnerable and sensitive to its surroundings. Therefore there are still some key problems to be solved when the FBG sensor is used in tunnel construction monitoring. Some key problems such as the protection of FBG sensor, temperature compensation and monitoring system integration for tunnel construction are discussed and analyzed through a practical engineering case. It is indicate that the survival rate of FBG sensor can be greatly raised via proper sealing and protection, and the real-time monitoring for the strain and stress of the arch and supporting bar and temperature of tunnel structure during the blasting excavating and concrete spraying of tunnel is feasible.

关 键 词：布拉格光纤光栅 隧道监测 传感器封装 温度补偿 喷射混凝土 

分 类 号：U455[建筑科学—桥梁与隧道工程]