Abstract
The land development in mountainous area here in Japan is geared towards being wild driven by recent high demands for land use. In this context, a lot of hillside and mountain side has been developed these days as inhabited districts or mountain resorts which may end up with a ruin in sediment disaster. Therefore, landslide susceptible area is increasing, and landslide which occures suddenly without any signes as well as can be found only by their unique topographies seems to be extremely important in order to predict susceptible area. On this point of view, the standards to pick up the landslide susceptible area based on stability analysis for this kind of landslide is considered here.
A risk assessment method by stability analysis and some standards factor of safety (Fc) derived from a probability density distribution of pseudofactor of safety gained by the Critical Slip Surface analysis by Dynamic Programming (CSSDP) is established.
Since this CSSDP can search automatically a critical slip surface that corresponds to the boundary between the moving zone and the stable one by the dynamic programming theory, although underground geological and/or geostructural condition is unknown. Needless to say, it can treat not only impact factor triggers landslide but slope nature.
Thus, the method gained in this study must be useful to estimate or evaluate the landslide susceptibility.
