库岸边坡变形场与水分场光纤监测技术研究

Study on optical fiber monitoring technique of deformation field and moisture field of bank slope

三峡库区滑坡灾害频发,采用高效的滑坡监测技术对预防和降低滑坡灾害十分重要。本文介绍了ROTDR(Raman Optical Time-Domain Reflectometry)、BOTDR(Brillouin Optical Time-Domain Reflectometry)和FBG(Fiber Bragg Grating)这3种光纤感测技术,以及课题组基于这3种技术研发的滑坡体变形场与水分场监测技术。以三峡马家沟I号库岸滑坡为例,介绍了相关的DFOS(Distributed Fiber Optic Sensing)监测方案、传感器布设工艺、光纤的保护方法和部分水分场及变形场监测结果的分析成果。监测结果表明:DFOS技术应用于库岸滑坡变形场和水分场监测可行,可为研究库岸滑坡演化机理及其预警预报提供一个新的监测手段。

Landslide hazards occur frequently in the Three Gorges Reservoir area.Therefore,it is of great importance to use highly efficient landslide monitoring techniques to prevent and mitigate these hazards.This paper describes three optical fiber sensing technologies,i.e.,ROTDR,BOTDR and FBG,and the corresponding landslide deformation field and moisture field monitoring techniques.Taking the Majiagou#1 landslide as an example,the DFOSbased monitoring scheme,the layout of sensors,and the method for fiber protection are introduced,and the monitoring results of deformation field and moisture field are analyzed.The monitoring results show that it is feasible to apply DFOS technology to deformation and moisture fields monitoring of reservoir landslides,which can provide a new method for investigating the evolution mechanism and early warning of reservoir landslides.