Abstract
The performance degradation of secondary lining is the main disease that affects the tunnel operation. Therefore,safety analysis on the secondary lining structure by optical fiber communication technology means importance to the tunnel operates health.According to the actual monitoring data,which is monitored by the optical fiber Bragg grating strain sensor embedded on the secondary lining of Tianxin tunnel,the best typical function model are selected for the non-linear regression analysis and then the regression curves which reflect the strain development variation trend are obtained.Results indicate that test methods achieved the judgment of tunnel structure stability by forecasting support nursing structure(monitoring points)strain trend,judging support nursing effect and analyzing on current and eventually tunnel stability of supporting structure.
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