Abstract
This study proposes a simple evaluation method of seismic safety of road embankments. The safety of the embankments is confirmed by comparing the analyzed sliding displacement with the allowable displacement. The method is simple, but it has the equivalent accuracy with the Newmark method. The proposed method consists of two-step evaluations. In the first step, the method uses the equivalent yield acceleration, which is the PGA of ground motion whose sliding displacement reaches the allowable displacement. The method extracts the embankments which have the possibility to slide longer than the allowable displacement. In the second step, the method easily calculates the sliding displacement assuming the planar sliding surface for all embankments extracted in the first step. The validity of the method was confirmed by the numerical simulation.
