2003 Volume 13 Pages 153-156
Proper tunnel support which is suitable for ground condition should be selected for safety and economical construction. Method of selecting support is mainly based on the past experience and the observation and measurement data in excavation should be used for the judgment of ground condition. In this study, impact values for face observation item calculated using cluster analysis and their tendency was examined. It was found that the values were different between rock characteristic and it may be possible to classify much clearly using the value calculated by cluster analysis.