基于分布式光纤传感技术的基坑监测

Foundation Pit Monitoring Based on Distributed Optical Fiber Sensing Technology

近年来,深基坑工程日益增多,传统监测手段无法全面反映深基坑开挖过程的变化规律。基于BOFDA光纤传感技术的光纤传感器具有信噪比高、空间分辨率高的特性,能对深基坑工程的支护体系实现有效监测。监测结果显示,光纤传感器在不同开挖过程中良好地反映了支撑轴力的变化规律,反映了支撑通长方向轴力的不均匀性。

In recent years,there has been an increasing number of deep foundation pit projects,and traditional monitoring methods can't fully reflect the changing laws of the deep foundation pit excavation process.Based on BOFDA optical fiber sensing technology,the optical fiber sensor has the characteristics of high signal-to-noise ratio and high spatial resolution,which can effectively monitor supporting system of deep foundation pit engineering.The monitoring results show that the optical fiber sensor well reflects the changing law of the support axial force during different excavation processes,and reflects non-uniformity of the support axial force in the length direction.