基于光纤传感的盾构隧道收敛变形监测研究

Study of shield tunnel convergence deformation monitoring based on optical fiber sensing

基于光纤光栅应变传感技术,建立了盾构隧道收敛变形的监测方法,提出了长标距光纤传感器的封装结构,建立了应变反演收敛变形的理论方法,通过室内足尺盾构模型试验,验证了所提方法的有效性,指出光纤传感在稳定性、耐久性等方面具有一定优势,应用前景广阔。

A new method is proposed for monitoring convergence deformation of shield tunnel based on Fiber Bragg Grating（ FBG） sensing technology,a long-gauge sensor was proposed to improve the sensing performance. Then,the method of assessing convergence deformation from strain measurement was proposed. The effectiveness of the proposed method was verified with a full size specimen of shield tunnel. Considering the additional advantage of optical fiber sensing,such as stability and durability,the proposed system presents broad application prospects.