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针对隧道绝对位移监测的重要性及常规位移监测方式的局限性,以光纤布拉格光栅(FBG)为核心敏感器件,研制了具有温度自补偿功能的用于测量岩体内部绝对位移的微型光纤光栅位移传感器。该传感器进行的性能测试表明,其灵敏系数为0.267nm/mm,线性拟合系数大于0.99。构建光纤光栅位移监测系统,并将其应用到海底隧道模型试验中,对开挖过程中隧道围岩9个关键测点的位移变化进行实时监测。试验结果显示,围岩位移变化量不超过25μm,表明该传感器能满足试验需求,实用性强。
Aiming at the importance of tunnel absolute displacement monitoring and the limitations of conventional displacement monitoring methods, a novel fiber grating displacement sensor with temperature self-compensation for measuring the absolute displacement inside the rock mass is developed based on fiber Bragg grating (FBG) sensor. The sensor performance tests showed that the sensitivity coefficient of 0.267nm / mm, linear fit coefficient greater than 0.99. The fiber grating displacement monitoring system is constructed and applied to the subsea tunnel model test to monitor the displacement changes of 9 key measuring points of tunnel surrounding rock in real time. The test results show that the displacement of surrounding rock does not exceed 25μm, indicating that the sensor can meet the test requirements and is practical.