In this study, in order to verify the effects of damaged quantities to maintenance prioritization with performance evaluation system, crack conditions which were subdivided as per performance evaluation grade, critical maintenance part and priority part are considered as evaluation factors of prioritization. This result prove that maintenance prioritization has been changed by damaged quantities.

With the recent earthquake measuring 5.4 in Pohang, attention is being raised to the effects of the structures caused by the earthquake. In this study, seismic effect of the tunnel structure was analyzed by the time history analysis method using the measurement results of the nearby structures. Most of the analysis results showed displacement and stress results of one tenth level of the artificial seismic wave using design seismic acceleration, and the actual field survey revealed that the effects of earthquakes were minor.

It is necessary to establish countermeasures to prevent spalling in the tunnel ceiling concrete lining from being linked to lack of lining thickness, leading to additional spalling. We analyzed the effect of thinning between the ceiling part and the lining thickness on the safety of the tunnel and confirmed the structural behavior of the lining based on the measured values after practically reinforcing the inside and filling the inside of the lining.

In this study, The correlation between drainage clogging of drain tunnel and leakage of lining was analyzed. As a result of analysis, the position of clogged drainage hole, leakage and efflorescence location are similar. When repairing leakage of lining, the maintenance method should be selected considering the clogging of tunnel drainage.