Mechanism of fluidized landslides triggered by cyclic softening of volcanic cohesive soils during earthquake

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  • WAKAI Akihiko
    Department of Civil and Environmental Engineering, Gunma University
  • CAI Fei
    Department of Civil and Environmental Engineering, Gunma University
  • UGAI Keizo
    Professor Emeritus, Gunma University
  • SODA Tsutomu
    Institute of Tephrochronology for Nature and History Co., Ltd.

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Other Title
  • 火山灰質粘性土の地震時繰返し軟化に起因する流動性地すべりとその機構解析
  • カザンバイシツ ネンセイド ノ ジシンジ クリカエシ ナンカ ニ キイン スル リュウドウセイ ジスベリ ト ソノ キコウ カイセキ

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Abstract

<p>  The fluidized landslide was one of the typical features in the major slope damages due to The 2011 off the Pacific coast of Tohoku Earthquake. In many slopes mainly composed of volcanic cohesive soils with high water content, their sudden strength degradation under the strong earthquake motion caused a long-distance travelling failure. In this study, the distributions of such type of landslides around Shirakawa-city are summarized briefly, and then a case study on the typical landslide at Hanokidaira in the city is presented as well. The landslide mechanism is simulated by the dynamic elasto-plastic finite element method where the cyclic loading characteristics of the sensitive soils are numerically formulated by the UW softening model with the appropriate material parameters based on the laboratory element tests with the undisturbed soil specimens. As a result, it is confirmed that the fluidized landslide was induced by the aforementioned mechanisms in the slope.</p>

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