ABSTRACT

Fibre-optic sensing technologies provide the opportunity to measure detailed structural response in real time over long durations. This paper describes a first-of-its-kind application of Fibre Bragg Grating (FBG) measurement to monitor the impact of tunnelling works on two Grade-I listed buildings in London, UK. After describing the principles behind the strain sensing technology, laboratory tests are discussed. These tests are used to calibrate strain sensors and validate the newly developed temperature compensation technique. The arrangement of sensors and their installation on the buildings is then presented. Fibre-optic temperature and strain measurements from the ensuing three-year monitoring period are compared with other independent measurements. It is demonstrated that the system enabled direct real-time monitoring of both the short- and long-term impact of tunnelling on the historic assets in a reliable manner.

摘要

光纤传感技术提供了长期实时测量详细结构响应的机会。本文介绍了光纤布拉格光栅 (FBG) 测量的首次应用，用于监测隧道工程对英国伦敦两座一级保护建筑的影响。在描述了应变传感技术背后的原理之后，讨论了实验室测试。这些测试用于校准应变传感器并验证新开发的温度补偿技术。然后介绍传感器的布置及其在建筑物上的安装。随后三年监测期间的光纤温度和应变测量值与其他独立测量值进行了比较。