基于分布式光纤的隧道振动监测系统试验研究

Experimental Study on Tunnel Vibration Monitoring System basedon Distributed Optical Fiber

运营期隧道突发事件发生频率的不断增高对隧道的健康监测提出了挑战。目前,国内铁路隧道对突发事件自动化监测的研究仍处于初期阶段。为验证京雄高速铁路隧道基于分布式光纤的振动监测系统的实施效果,本文开展了钻机打孔、挖掘机铲土、工程车辆行驶和隧道内落石等振动事件的模拟试验。结果表明:该监测系统对振动事件具有较高的灵敏度,通过时、频域分析方法可短时间确定振动事件的发生位置,定位精度较高,满足工程对突发事件准确定位的需求。

The more and more frequent tunnel emergencies during railway operation challenges the health monitoring of tunnels.At present,the study on automatic emergency monitoring in railway tunnels in China is still at the initial stage.In order to verify the effect of vibration monitoring system based on distributed optical fiber in Beijing-Xiongan high-speed railway tunnel,this paper simulated the vibration events such as drilling by drill,shoveling by excavator,driving of engineering vehicles,and falling rocks in the tunnel.The results show that the monitoring system is highly sensitive to vibration events,and the positions of vibration events can be identified in a short time by time and frequency domain analysis methods,with high positioning accuracy,which can meet the requirements for accurate positioning of emergencies.