基于光纤光栅传感技术的锚杆横向载荷识别方法与实验  

Anchor transverse load identification method and experiment based on fiber optic grating sensing technology

作　　者：林龙镔[1] 董小鹏 LIN Longbin;DONG Xiaopeng(School of Civil Engineering,Xiamen University Tan Kah Kee College,Zhangzhou 363105,China;School of Electronic Science and Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]厦门大学嘉庚学院土木工程学院,福建漳州363105 [2]厦门大学电子科学与技术学院,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2023年第4期576-581,共6页Journal of Xiamen University：Natural Science

基　　金：福建省住房和城乡建设厅科技研究开发计划项目(2022-K-139)。

摘　　要：锚杆被广泛使用于边坡及隧道等岩体支护中,锚杆的轴向应力、横向荷载与横向变形等信息是判断支护岩体安全的重要参数.本文基于光纤光栅传感技术,提出了一种测量锚杆横向荷载及横向变形的实验方法,该方法可满足传统锚杆轴向应变测量的功能需求,并新增测量锚杆横向荷载大小、方向和变形等功能.实验结果表明:横向荷载方向测量平均值最大误差为-0.48°,横向荷载测量值相对误差平均值最大为-4.2%.实验为光纤传感技术在锚杆监测领域的应用提供了新的可能.Anchor rods are widely used for rock support,such as slopes and tunnels.Naturally,the information related to the axial stress,lateral load and lateral deformation of these anchors becomes important parameters for determining the safety of the supported rock mass.An experimental method for measuring the lateral load and lateral deformation of anchor rods based on fiber optic grating sensing technology is presented.It satisfies functional requirements of traditional anchor axial strain measurement,and adds functions of measuring the magnitude,direction and deformation of anchor transverse load.Experimental results show that the maximum error of the average value of the lateral load direction measurement equals-0.48°and the maximum relative error of the average value of the lateral load measurement equals-4.2%.Hopefully,our study can serve as a reference for the fiber optic sensing technology in the field of anchor monitoring.

关 键 词：光纤布拉格光栅 锚杆 智能 监测 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]