METHOD USING OPTICAL FIBER SENSORS OF TWO ROWS FOR MEASURING A SHAPE OF A TUNNEL AND STRESS, CAPABLE OF SEPARATING STRESS CAUSED BY THRUST AND STRESS CAUSED BY BENDING AND MANAGING THE SAME

摘要

PURPOSE: A method using optical fiber sensors of two rows for measuring a shape of a tunnel and stress is provided to obtain displacement caused by bending by the optical fiber sensors of two rows, thereby accurately sensing the deformation of the tunnel caused by the time elapsed.;CONSTITUTION: A method using optical fiber sensors of two rows for measuring a shape of a tunnel and stress is as follows. A plurality of optical fiber strain gauges composed of the optical fiber sensors of two rows is arranged in the tunnel(S10). The strain caused by thrust and the strain caused by bending are separated from the optical fiber strain gauges(S20). The shape deformation of the tunnel is extracted by the strain caused by bending(S30). When arranging the optical fiber strain gauges, the optical fiber strain gauges are buried inside the tunnel or installed in the inner periphery of the tunnel while being arranged a constant space between the optical fiber strain gauges.;COPYRIGHT KIPO 2013;[Reference numerals] (S10) Step of arranging a plurality of optical fiber strain gauges comprising two rows of optical fiber sensors in a tunnel; (S20) Step of separating strain caused by thrust and strain caused by bending from the optical fiber sensors arranged in two rows; (S30) Step of extracting the deformation of the tunnel from the strain caused by bending