基于分布式传感光纤的隧道二次衬砌全寿命应力监测方法

应用气吹灌浆铺设技术将分布式光纤传感器埋入二次衬砌混凝土内部,并将光纤传感器时变应力场监测结果与施工初期埋入的传统传感器初始应力场叠加,得到隧道二次衬砌的长期真实应力水平;通过对采用气吹灌浆铺设的光纤传感器进行标定试验,对二次衬砌长期应力场的监测断面进行应力水平分析,提出将时间序列分析方法应用于所有监测断面健康状态评估。结果表明:所提出的方法能够实现对隧道二次衬砌的全寿命健康诊断与评估。

Life-cycle Stress Monitoring Method for Tunnel Secondary Lining Based on Distributed Optical Fiber Sensor

Distributed optical fiber sensors were embedded into secondary lining concrete by air-blowing and vacuum grouting technology.The initial stress field and time-varying stress field of secondary lining were established respectively by using traditional sensors and monitoring of distributed optical fibers.The long-term true stress level which was used to diagnose secondary lining was calculated by adding initial stress field to time-varying stress field.Calibration experiment of optical fiber sensor was carrie...