Abstract

Convergence measurements are required to confirm the structural integrity of a tunnel; however, such inspections typically interrupt its function. In particular, the inspection of power plant aqueduct tunnels, in which water constantly runs, requires the shutdown of the plant and drainage of the tunnel. The authors accordingly installed an optical fiber sensor around the interior circumference of an aqueduct tunnel to calculate its cross-sectional deformation using the measured strain distribution, realizing real-time and continuous monitoring of tunnel convergence.

© 2020 The Author(s)