基于分布式光纤技术的路基沉降监测应用研究  

RESEARCH ON APPLICATION OF DISTRIBUTED OPTICAL FIBER MONITORING TECHNOLOGY FOR SUBGRADE SETTLEMENT

作　　者：韦超群 邓清禄[1] WEI Chaoqun;DENG Qinglu(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,武汉430074

出　　处：《工程地质学报》2020年第5期1091-1098,共8页Journal of Engineering Geology

基　　金：国家重点研发计划(资助号:2017YFC1501301)。

摘　　要：路基沉降监测是公路工程中最基础的工作之一,它对于工程的安全施工及运营具有显著的作用。传统的路基监测方法大都是点式的,具有一定的优点,但也存在着漏检、复杂等弊端。本文针对研究比较广泛的分布式光纤传感监测技术提出一种新型的光纤布设方法,并依托实际的路基监测工程进行相关理论计算和试验分析等,然后将传统监测手段的数据结果与其进行对比。结果表明:通过相关计算,传感光纤锯齿状的布设形式能够反应路基的沉降情况;与传统监测手段的结果相比,传感光纤锯齿状监测方法在相同的条件下能够获取大量的监测数据,其结果更精确,且在一定范围内更接近实际情况;通过MATLAB语言的三维3次样条插值法,光纤数据能够更加直观地表达区域内的路基沉降情况。分布式光纤传感监测技术的操作简单、数据量多、精度高等特性在路基沉降监测中具有良好的效果,为更深层次的路基沉降及工程研究提供参考。Subgrade settlement monitoring is one of the most fundamental work for safe construction and operation of highway engineering.The traditional roadbed monitoring methods are mostly point-based,simple and easy to operate,but have technical problems such as serious missed inspection.Recently,the high-spatial-resolution and accurate-microstrain-recognition distributed optical fiber technology has been widely used in various fields.It can provide more efficient subgrade monitoring method than the traditional methods.Therefore,this paper introduces an advanced distributed optical fiber sensing technology and its novel saw-tooth layout method for the subgrade settlement research and calculation analysis.Concurrently,a comparison research with the traditional detection methods is implemented.The results show that the saw-tooth optical fiber can generate more monitoring data and reflect the actual subgrade settlement with more detailed information.The three-dimensional cubic spline interpolation method based on MATLAB further confirms that the saw-tooth optical fiber can intuitively express the subgrade settlement in testing area.The distributed optical fiber sensing technology has simple operation,wide monitoring range and high accuracy,which makes it have better performance in settlement detection.This method and its novel layout can provide important technical support for practical engineering applications.

关 键 词：公路工程 路基沉降监测 分布式光纤传感监测技术 MATLAB 3次样条插值法 

分 类 号：U416.03[交通运输工程—道路与铁道工程]