In this study, for estimating the loss and damage ratio of maintenance monitoring sensor of foreign railroad tunnel, the loss and damage condition of maintenance monitoring which is installed and operated in the foreign tunnel structure is researched and analyzed. The total loss and damage ratio at the elapsed time of 5-6 years after installation is 13.9% in the Channel Tunnel of England. Therefore, it is reasonable to reflect that the total loss and damage ratio of maintenance monitoring sensor of railroad tunnel is estimated provisionally 15% on design, and hence the study of the loss and damage ratio with the number of elapsed years in long-term by the measurement category will be needed.

• 우종태(경복대학교 건설환경디자인학과 교수) | Woo, Jong-Tae