Jun Li, Dingbo Zhang, Xinwei Zhang, Jiarui Zhang, Ruixu Yao, Binbin Fan. Safety Monitoring of Railway Tunnel Structure During Operation Period Based on Fiber Grating Sensing and Video Displacement Meter Technology[J]. Laser & Optoelectronics Progress, 2023, 60(23): 2312006

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- Laser & Optoelectronics Progress
- Vol. 60, Issue 23, 2312006 (2023)

Fig. 1. Schematic diagram of tunnel safety monitoring system

Fig. 2. Schematic diagram of FBG structure

Fig. 3. Schematic diagram of the optical video replacement technology

Fig. 4. Schematic diagram of template matching technology

Fig. 5. Tunnel site working condition

Fig. 6. Comprehensive drawing of sensor installation information

Fig. 7. Topological diagram of tunnel structure safety monitoring system

Fig. 8. Double-layer lined tunnel model

Fig. 9. Tunnel model static load

Fig. 10. Tunnel strain map at train passing time

Fig. 11. Long-term trend chart of tunnel strain stability

Fig. 12. Tunnel settlement map at train passing time

Fig. 13. Long-term trend chart of tunnel settlement stability
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Table 1. Data fluction before and after the train passes
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Table 2. Long-term data of tunnel measuring points

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