摘要
为防止城市轨道交通控制保护区内的各类施工作业对隧道结构安全造成影响,需要采用隧道环境振动监测系统对安全隐患进行及时预警。介绍了基于分布式光纤的隧道环境振动监测系统的感应原理和振动信号采集、分析方法。通过现场试验,研究分析在人为敲击、列车运行、地面车辆行驶、地面施工作业等工况下,基于分布式光纤的隧道环境振动监测系统采集的振动信号,对所采集振动信号的分析结果表明:基于分布式光纤的隧道环境振动监测系统对微振动事件具有比较高的检测灵敏度,通过对时域、频域及能量图等特征分析能够区分不同类型的振动信号,能够对隧道结构安全状态进行有效监测,达到提前预警的目的。
To prevent the various construction operations in urban rail transit control protection zone from affecting tunnel structure safety,a tunnel environment vibration monitoring system is needed to provide timely early-warning of potential hazards.The sensing principle and vibration signal acquisition and analysis methods of tunnel environment vibration monitoring system based on distributed optical fiber are introduced.Through field experiments,the vibration signals collected by the tunnel environment vibration monitoring system based on distributed optical fiber are studied and analyzed under various working conditions such as manual tapping,train operation,ground vehicle driving,and ground construction operations.The results show that the above monitoring system has relatively high detection sensitivity for micro-vibration events,and can distinguish different types of vibration signals through feature analysis of time-domain,frequency-domain and energy map,thus tunnel structure safety status is effectively monitored,serving the purpose of early warning.
作者
廖志军
朱俊峰
邓文明
LIAO Zhijun;ZHU Junfeng;DENG Wenming(Hangzhou Metro Operation Co.,Ltd.,310002,Hangzhou,China)
出处
《城市轨道交通研究》
北大核心
2023年第6期230-235,共6页
Urban Mass Transit
关键词
城市轨道交通
隧道环境
振动监测
分布式光纤
urban rail transit
tunnel environment
vibration monitoring
distributed fiber
