Journal of the Japan Society of Erosion Control Engineering, Vol.59,No.4,2006
Topographic effects of the seismic slope displacement and ground acceleration by earthquake using a dynamic response analysis
Yuji YASUDA Satoshi TSUCHIYA Takahisa MIZUYAMA Kazuki MATSUMURA Hirotaka OCHIAI Masaaki TAKAHASHI Wendong TANG
Abstract
There has been a tendency for seismic failures to occur frequently on concave
or flat slopes or slope having abrupt local unevenness. This tendency has been
considered to be affected greatly by the topographic effects that amplify the
acceleration of seismic waves. In order to clarify the quantitative evaluation
of the amplitude of seismic acceleration and how the amplitude affects the slope
displacements, a three]dimensional non]linear dynamic response analysis based
upon the elasto]plastic theory was applied to three model slopes having different
topographic features, that is, a convex slope, convex and flat slope, and uneven
slope. The results of the analysis are summarized as follows. Amplitude of seismic
wave acceleration is affected by slope having abrupt local unevenness. Especially,
changes slope curvatures in the surface slope affect on amplification or attenuation
of seismic wave acceleration. Residual displacements were not so clear, but it
is to be greater by local unevenness.
Key words:earthquake, dynamic response, ground acceleration, finite element method,
slope failure
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