基于光纤测振系统的地铁隧道防破坏监测

Anti-damage Monitoring of Subway Tunnel Based on Optical Fiber Vibration Measurement System

针对地铁隧道周边的第三方施工对地铁隧道的破坏事件难以实时监测的问题,提出利用分布式光纤传感技术可空间和时间连续测量的技术优势,对地铁隧道沿线的所有振动信号进行采集和分析。利用图像模板滤波算法,对施工激励信号进行增强,同时对地铁列车产生的振动干扰进行过滤。经过现场模拟施工激励测试以及长期的运行统计,系统对具有威胁性的施工信号能够及时预警,系统的误报频次经过多次的迭代优化,可达到小于0.2次/天。

In view of the difficulty in real-time monitoring of the damage events caused by the third-party construction around subway tunnels, this paper proposes to collect and analyze all vibration signals along the subway tunnels by using the distributed optical fiber sensing technology, which can be measured continuously in space and time. The image template filtering algorithm is used to enhance the construction excitation signal and filter the vibration disturbance caused by subway train. Through field simulation construction incentive test and long-term operation statistics, the system can timely warn threatening construction signals, and the false positive frequency of the system can reach less than 0.2 times/day after several iterations and optimization.