分布式光纤监测技术在长大深埋水工隧洞中的应用

Application of Distributed Fiber Optic Monitoring Technology in Long and Deep Buried Hydraulic Tunnels

【目的】在地质条件、地壳运动等因素的影响下,长大深埋水工隧洞开挖时应力出现复杂力学响应,传统振弦式仪器在长隧洞中存在诸多问题。分布式光纤监测技术则可以满足施工安全监测需求。【方法】分布式光纤监测技术具有抗干扰能力强、测试距离较长、耐久性好、使用成本低等优点,在长大深埋水工隧洞中探索其应用是十分有必要的。【结果】实践发现,基于布里渊效应分布式的光纤传感技术对隧洞监测更为准确高效,且不存在监测盲区,可更加全面反映出结构的变形、振动和温度等特征。【结论】研究结果表明,分布式光纤监测技术在长大深埋水工隧洞中具有广阔的应用前景,可实现准确、实时、高效的数据监测与分析,特别是在隧洞内水位、温度、应变等参数的监测和预警方面,该技术有显著的优势。

[Purposes]Under the influence of geological conditions,crustal movement,and other factors,the stress during excavation of long and deep buried hydraulic tunnels exhibits complex mechanical re-sponses.Traditional vibrating wire instruments have many problems in long tunnels.Distributed fiber op-tic monitoring technology can meet the requirements of construction safety monitoring.[Methods]The distributed optical fiber monitoring technology has many advantages such as strong anti-interference ability,long testing distance,good durability,and low usage cost,which is particularly necessary to ex-plore and apply it in long and deep buried hydraulic tunnels.[Findings]Practice has found that distrib-uted fiber optic sensing technology based on the Brillouin effect is more accurate and efficient in monitor-ing tunnels,and there is no blind spot for monitoring,which can more comprehensively reflect the defor-mation,vibration,and temperature characteristics of the structure.[Conclusions]It indicates that distrib-uted fiber optic monitoring technology has broader application prospects in long and deep buried hydrau-lic tunnels,which can achieve accurate,real-time,and efficient data monitoring and analysis,especially in the monitoring and early warning of parameters such as water level,temperature,and strain inside the tunnel.This technology has significant advantages.