Tunnel were the inverse analysis based on the crown displacement calculated based on the generation of the result 63.80mm crown displacement measurement result. Three-dimensional inverse analysis up to the crown displacement was 60.7mm has occurred, which was considered similar to a two-dimensional inverse analysis 63.6mm.*

Tunnel were the inverse analysis based on the crown displacement calculated based on the generation of the result 63.80mm crown displacement measurement result. Inverse result was mainly to review the most significant impact on the interpretation weathed rock modulus of elasticity was smaller than the measurement when evaluating design values.*

In this study, it analyzed a monitoring data, based on the initial limit values of monitoring in subway, of concrete lining stress, reinforcement stress obtained from the Seoul metropolitan subway No 6,7 lines about 5 years.

By comparing the computed displacement with the stress and displacement determined by entering side numbers 3, 5, and 7 into the tunnel lining inverse analysis program, the optimal number of monitoring points is determined. From the results of the research, it can be inferred that the number of monitoring points needs to be at least 5 points, considering the efficiency of monitoring in practice and the loss-and-damage rate of tunnel monitoring.

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.

According to the analysis results of the maintenance monitoring which are located on the 5, 6th subway line, they are analyzed that the stress of concrete lining and reinforced bar are converged gradually after 45 months. Therefore Monitoring of measurement and analysis frequency is conduct more often within about 4 years after the measuring instrument installation. Four years later, slowing the frequency of measurement is considered reasonable.