ABSTRACT
Many landslides are active in different parts of Japan. So far, the study shows that the landslides in Japan based on the base rocks can be classified into three major groups: Tohoku Region green tuff landslides, Hokuriku-Hokubu Kyushu tertiary landslides, and Tectonic Line fractured zone hard rock landslides. A study was carried out to investigate the effect of minerals on the strength of landslide clays of all these landslides. It was also studied whether or not the results of the remolded and undisturbed samples are same. The strength characteristics of landslide clays from fractured zone and tertiary landslides were found to be nearly similar which is because of the similarity in clay mineral content. The ϕ′ and ϕ r for the landslide clays containing smectite were very small ranging from 10° to 20°, whereas those for the landslide clays containing chlorite, illite, and mica as their mineral content were about 15° to 25°.
