Abstract
Seismic safety evaluation of earth works on liquefiable ground currently uses Δu-method or seismic coefficient method to calculate the factor of safety. Recnetly, coupled effective stress dynamic analysis is gradually used to calculate the residual displacement induced by the earthquake including the possible liquefaction. This paper proposes to use seepage analysis, coupled effective stress dynamic analysis, and shear strength reduction technique to calculate the deformation and the factor of safety. We analyzed the Lower and Upper San Fernando Dam using the proposed approaches. The major slide for the Lower San Fernando Dam and the residual deformation for the Upper San Fernando dam was re-produced well.
