Mechanism of Rapid Long Runout Motion in the May 1997 Sumikawa Reactivated Landslide in Akita Prefecture and the July 1997 Harihara Landslide-Debris Flow, Kagoshima Prefecture, Japan

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Other Title
  • 秋田県澄川地すべり, 鹿児島県針原川土石流における高速長距離土塊移動のメカニズムについて
  • アキタケン スミカワ ヂスベリ カゴシマケン ハリハラガワ ドセキリュウ ニ オケル コウソク チョウキョリ ドカイレ イドウ ノ メカニズム ニ ツイテ

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Abstract

Two disastrous long runout rapid landslides caused big disasters in Japan, 1997. One is a reactivated type landslide which traveled over 1.5 km in Akita Prefecture. Another is a rapid landslide-debris flow which killed 21 persons living on a debris fan in Kagoshima Prefecture. The authors took samples in both landslides and simulated the stress condition at the initiation of landslide motion by the stress control ring shear apparatus. The test results suggested that the sliding surface liquefaction of the saturated andesitic debris in both landslides played a key role for the rapid long runout landslide motion. One of the remarkable test results is that the andesitic debris showed a low apparent friction angle of about 5 degrees after failure even in the drained state of shear box and during gradual increase of pore pressure. Excess pore pressure generation in the shear zone after failure was much greater than the pore pressure dissipation, and the permeability in the shear zone was much decreased due to grain crushing by shearing.

Journal

  • Landslides

    Landslides 35 (2), 29-37_1, 1998

    The Japan Landslide Society

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