In combination of the actual project in Dalian Baiyun Mountain Tunnel, this paper introduces the principle of fiber optic sensor\nmonitoring system based on optical time domain reflectometer.Then, based on the orthogonal design and even design scheme, this\npaper carries out a numerical experiment on the tunnel surrounding rock and establishes a regressionmodel of themapping relation\nbetween surrounding rock parameters of operation tunnel and the monitored displacement in order to set the difference between\nthe monitored displacement and the calculated displacement as the fitness function. In the end, this paper carries out parameter\nidentification based on the differential evolution algorithm. Achievements of the study proved that real-time safety warning could\nbe realized inside the tunnel by monitoring the deformation parameters of tunnel vault at real time relying on the optical-fiber\nsensing system of the optical time domain reflectometer (OTDR). Parameters identification was carried out on the structure\nwith differential evolution according to measured data and selected parameters, and great coincidence was obtained between the\nmeasured displacement and the identified parameters displacement, which proved the strong adaptability of the method.
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