Abstract
The active earth pressure during earthquake is usually calculated by Mononobe-Okabe or modified Mononobe-Okabe method which makes the same seismic coefficient acting in a soil wedge of backfill. A new application method in consideration of the reduction effect of horizontal seismic coefficient is proposed in the paper. The method enables expression which does not cause rapid increase of the active earth pressure and the reduction of angle of slip surface with increasing in a seismic coefficient. The object retaining wall is a cantilever retaining wall with heel base, and the setting method of the angle acting of earth pressure on the virtual back is also proposed.
