Abstract

In this study, we carried out investigation and analysis on dam ages in tunnels on order to provide the basicinformation for the safety assessment of tunnels and to minimiz e the potential damage of the same kind as investigated.The frequencies of occurrence in terms of 4 items, i.e., servic e life interval, type of the damage, cause of the damage, andgeological condition, were examined and summarized based on 44 foreign and domestic cases of tunnel damages. Also,we carried out a survey research of which the content included 28 questions on the tunnel safety assessment. Theanswers collected from domestic experts in tunneling suggested that the most probable cause of the tunnel damages wascracking in tunnels at 42~58%. They also suggested that the poo r constrution work strongly caused the damages.Therefore, to ensure tunnel safety, high quality of constrution should be maintained as examined. The types of damageand their extent of influence on the overall tunnel safety are of practical importance to be used in the artficial intelligentsystem for tunnel safety assessment.