光纤光栅传感技术在锚索监测中的应用研究

Study on Application of FBG Sensing Technology in Anchor Monitoring

锚索应力、应变状态的长期监测,一直是国内外岩土工程界关注的焦点。传统的监测手段(如电阻应变片测量技术)暴露出灵敏度低、长期稳定性差、寿命短等缺点。针对这一现状,提出了将光纤光栅传感技术应用于锚索应力、应变监测的新方案。结合锚索预应力监测系统,介绍光纤光栅传感原理,并进行光纤光栅和电阻应变片的对比实验,根据实验结果,分析这一方案的可行性和优点。

The long-term Monitoring of anchor stress and strain state is always a focus problem in the rock engineering field.There are many disadvantages in traditional monitoring methods,such as low sensitivity,poor stability and short span.In order to overcome these disadvantages,a new design is stated that fiber Bragg grating sensor (FBG) is adopted to monitor the stress and strain of anchor in this paper.Based on the basic theory of the fiber optical Bragg sensor (FBG) and the compared experiment done between the FBG sensor and the common electricity sensor stuck on the anchor,both its feasibility and advantages are analyzed.