基于BOTDA的隧道变形监测技术研究

由于隧道工程所处环境的特殊性与复杂性,为保证安全运营,须对其进行长期变形监测,提出了一种将气吹敷设传感光纤法和真空灌浆固定传感光纤法相结合的光纤传感器铺设方法。该方法能在较短施工期内将分布式光纤传感器准确埋入混凝土内部,同时采用经典剪滞理论分析了该方法铺设的传感光纤感应结构应变的有效性,并结合工程应用介绍了基于分布式光纤传感系统的隧道变形监测技术的基本方法。

A Study on Tunnel Deformation Monitoring Based on BOTDA

Due to the particular and complex environment of tunnel engineering,the long-term structural deformation monitoring should be adopted to ensure the operation security of tunnel.In this paper,a new embedded method based the air-blowing and vacuum grouting for long distance microtubule is introduced,by which the distributed optical fiber sensors can be accurately embedded into concrete in a short period.The analysis of the strain transferring mechanism proves that the embedded distributed optical fiber can ef...