分布式布里渊光纤传感技术在工程安全监测的应用

Application of Distributed Brillouin Optical Fiber Sensing Technology in Engineering Project Safety Monitoring

工程安全监测是通过对工程本体及其周边环境进行实时、在线监测,分析其稳定性,并对工程安全进行预警。相对于电子传感系统,分布式光纤传感技术具有很大的优越性,如分布式、长距离、实时性和准确性等,可满足工程安全监测和早期预警的要求。以基坑测斜和隧道涵洞变形监测为例,介绍了依据布里渊频移原理和分布式光纤传感器技术在安全监测方面的应用。结果表明:分布式布里渊频光纤技术能够分别准确地反映基坑工程的变形情况和地铁涵洞顶部的岩层应变,是一种比较理想的工程安全监测方法。

The contents of engineering project safety monitoring include real-time, on-line monitoring, stability analysis and early safety warning for project entity and peripheral environment. Comparing to electronic sensing system, the distributed optical fiber sensing technology has great superiority, such as distributed, long distance, real-time and accuracy etc. can satisfy requirements of project safety monitoring and early warning. Taking the foundation pit inclining monitoring and tunnel culvert deformation monitoring as examples, have introduced the application of distributed optical sensor technology based on the Brillouin frequency shift principle in safety monitoring. The result has shown that Brillouin frequency shift optical fiber technology can accurately reflect foundation pit deformation state and subway culvert roof strata strain respectively, thus a rather ideal engineering project safety monitoring method.