ABSTRACT
The Kuchisakamoto landslide, situated in Shizuoka prefecture, Japan, is a huge rockslide. It lies near the southern Japanese Alps. As the landslide is located near tectonic line and subjected to continuous rainfall in monsoon, it was highly active. During past hundreds of years it has slid more than 50m horizontally. The landslide was designated as a potential landslide area in 1960. However, substantial movement was recorded only after 1988, after which intensive landslide investigation works, followed by enormous landslide prevention activities were carried out. Besides various investigation works groundwater levels at various boring points and pore water pressure are being measured. Present paper clarifies the relationship of the movement of landslide with other parameters, especially, pore water pressure. The analysis was done using seepage analysis software. The factor of safety of landslide was analyzed using the pore-water pressure value and commonly used groundwater level converted to pressure, to compare the two methods.
