Pore-pressure fluctuation and run-out characteristics of the granular mass flow

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  • OKADA Yasuhiko
    Incorporated Administrative Agency Forestry and Forest Products Research Institute
  • OCHIAI Hirotaka
    Incorporated Administrative Agency Forestry and Forest Products Research Institute

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  • 土砂流下実験における間隙水圧の動的変化と流下土砂の運動特性
  • ドシャ リュウカ ジッケン ニ オケル カンゲキ スイアツ ノ ドウテキ ヘンカ ト リュウカ ドシャ ノ ウンドウ トクセイ

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Abstract

Changes in pore-pressure and normal flow height in the granular mass flow had been investigated on sand and pumiceous gravel samples by quasi-real scale model flume tests. The excessive pressure head was observed under the sand flow, which was about 1.5 times as much as normal flow height. In the case of pumiceous sample, no excessive pressure head was observed, however, it traveled longer than the sand sample. This was because pumiceous sample had very small unit weight and it must have almost floated in the water during the experiments. The series of this experiments revealed that the both views of maximum travel distance and the extent of congregation of soil deposits were of great importance. For the sake of expressing the granular flow phenomena from those viewpoints, the new parameter “run-out characteristics index (ƒ)” was proposed as the ratio of the equivalent coefficient of friction (tan φa) to the equivalent coefficient of friction between gravity centres before and after failure (tan φag).

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