Effects of predominant period of seismic wave and S-wave propagation on the strain depth-profile in a landslide

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  • SHIBASAKI Nobuyuki
    Public Works Research Institute Erosion and Sediment Control Research Group Now in NIPPON KOEI CO., LTD.
  • ISHII Yasuo
    Public Works Research Institute Erosion and Sediment Control Research Group
  • MIWA Kenji
    Reconstruction Agency

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  • 地震加速度波の卓越周期と地盤のS波速度構造が地すべり斜面の歪発生に及ぼす影響
  • ジシン カソクドハ ノ タクエツ シュウキ ト ジバン ノ Sハ ソクド コウゾウ ガ ジスベリ シャメン ノ ワイ ハッセイ ニ オヨボス エイキョウ

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Abstract

<p>  To clarify landslide trigging mechanism of earthquakes, we investigate the effect of maximum acceleration, predominant period of earthquake acceleration wave and material property of ground. One-dimensional earthquake response analysis was performed in Yanagihara landslide of Niigata prefecture which showed relatively small strain increasing in pipe strain gages at the time of earthquakes. As a result of analysis using multiple earthquake acceleration waves with different maximum acceleration, the predominant period of earthquake acceleration wave and the own natural period of ground effect to strain increasing of the slope of landslide. S-wave velocity structure also effect to strain increasing. Analysis result shows good agreement with depth which showed maximum strain increasing by pipe strain gage measurement. Therefore, one-dimensional earthquake response analysis using investigation result of the S-wave velocity profile could be used for initial evaluation of strain increasing by earthquake in landslide.</p>

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