EFFECT OF SEISMIC WAVE AMPLITUDE AND FREQUENCY CHARACTERISTICS ON RESIDUAL DISPLACEMENT ON SLOPES

Abstract

 To reasonably evaluate the safety of slopes during earthquakes, it is important to know how various characteristics of seismic waves affect the susceptibility of slopes to collapse. In this study, we focused on amplitude and frequency as indices that characterize seismic waves and investigated them by two-dimensional elasto-plastic finite element analysis using many sinusoidal waves consisting of combinations of these indices. First, the distributions of the absolute acceleration response and residual displacement of the slope are characterized by their dependence on the amplitude and frequency of the input wave. Furthermore, it is shown that the residual displacement on the slope shoulder can be large not only in the frequency band where the frequency of the input wave is close to the natural frequency of the slope and the response is large due to resonance, but also in the band where the frequency is small if the amplitude of the input wave is sufficiently large.