Slope failures which caused disasters in 2004 and 2005 are investigated taking note of the travel distance, fluidized condition, influence of structures. In the investigated cases, most of failed soil was traveled under 5m (81.6%), deposited near the end of slope (85.5%). In the cases without structure, 41% of the failed soil mass was keeping the shape. Therefore, most of the failed soil mass should be not fluidized. In the cases with receiving type wall structures, receiving effect was recognizable for slope failure traveling under 10m, but not for over 10m. Therefore receiving type wall structure should have limit of receiving large or fluidized failed soil. In most of the studies on the movement of failed soil mass, condition of fluidization and the movement of fluidized soil were subjected. The movement mechanism of not fluidized soil mass caused by slope failure should be studied hereafter.

Key words�Fslope failure, collapsed soil movement, fluidization, structure