Characteristic of cut slope in sangun metamorphic region failed by heavy rainfall : in case of Ube, Yamaguchi

From the standpoint of petrology and soil engineering, an investigation was made on slopes which failed due to heavy rain during the years 1991&acd

93 in the Sangun metamorphic region in the Ukegawa district of Ube, Yamaguchi prefecture. It was found that the slope grounds consist of clay with gravel to silt produced by weathering of the basic schist, contact metamorphic rock and granite. Also, it was clarified that slope failure is divided into two classes : one is the slip occurred between the soil layer and soft rock with same host rock, and the other is between the soil layers with different host rocks.