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隧道二次衬砌性能劣化是影响隧道健康运营的主要病害,利用光纤通信技术对二次衬砌进行结构安全性分析,是保证隧道工程健康运营的重要手段。以埋入式光纤Bragg光栅应变传感器对田心隧道二次衬砌监测的实际数据为依据,选择最佳的典型函数模型对隧道的监测数据进行非线性回归分析,得出能够反映应变发展变化趋势的回归曲线,预测支护结构(监测点)的应变趋势,判断支护效果,对隧道支护结构当前的和最终的稳定性进行分析,从而实现对隧道结构部的稳定性判断。
Tunnel lining secondary performance degradation is the main disease affecting the healthy operation of the tunnel. Using optical fiber communication technology to analyze the structural safety of secondary lining is an important means to ensure the healthy operation of tunnel engineering. Based on the actual data of the monitoring of the secondary lining of Tianxin tunnel with the buried fiber Bragg grating strain sensor, the best typical function model is selected to conduct the non-linear regression analysis of the monitoring data of the tunnel, and the result shows that it can reflect the trend of strain development and change Regression curve to predict the strain trend of the support structure (monitoring point), to judge the support effect, and to analyze the current and final stability of the tunnel support structure in order to achieve the stability judgment of the tunnel structure.