Abstract
The report discusses the methodology of the landslide risk evaluation of the earthquake triggered slope movement at the artificial land reclamation area. The two case studies are used to evaluate the adaptability of this method. One is the case of Takamachi New Residential area damaged by Mid Niigata Earthquake 2004 and the other is Tsurugaya New town damaged by the Miyagi-oki Earthquake 1978.
Recently, artificial land reclamation by civil earthwork in slope areas has been widely developed in and around urbanized area. Some area such as the valley filled with reclaimed soil is relatively weak compared with cut portion. In spite of the weakness of the ground, there were poor techniques of the evaluation of slope instability.
The authors have developed the risk evaluation technique titled “Three dimensional slope stability analysis based on the simplified RBSM” to apply to the artificial land reclamation area. This has the advantage of not only being simple but also including the earthquake force and direction of seismic wave for calculation. Thus, the technique will be used to get the spatial distribution of the degree of Safety Factor (Fs).
The Fs value distributions in the two case studies are evaluated by the analyses and well explain the real distributions of the slope damages.
