Abstract
This study proposes two methods of stability for earth structures resisting earthquakes based on the shakedown theory and discusses their applicability in practice. One is a stability method for repetitive static loads based on the seismic coefficient concept (Method A) and the other is a stability method which considers the acceleration time history of the earthquake accurately (Method B). The applicability of Method B was evaluated for both sine and irregular acceleration waves. The applicability of the seismic coefficient method (Method A) is discussed in comparison with Method B. The conclusions from this study are as follows : 1) The effects of periods of enforced accelerations on embankment stability are suitably evaluated with Method B. The stability depends not only on the enforced acceleration but also the dynamic properties of the subsoil profile. The resonance of embankment to the enforced acceleration was simulated. 2) The result of Method A was coincident with that of Method B for the long period case.
