地下水流動と地すべり変動の特徴について

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タイトル別名
  • Relationship between Groundwater Flow and Landslides.
  • チカスイ リュウドウ ト ジスベリ ヘンドウ ノ トクチョウ ニ ツイテ

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Rainfall and melting snow infiltrate fissures and aquifers, often triggering landslides on slip surfaces. This paper presents five typical landslide areas for which the depth of slip surface was determined and time series data of groundwater level and slide displacements. The relation between the displacement of the slide and the pore water pressure was examined especially closely. The useful results obtained are summarized below.<br>(1) The relations between the displacement of slide and the pore water pressure are classified into three types.<br>The first is a type of rock mass landslide that is sensitive to the pore water pressure the whole year round. In the relation curve of the velocity of displacement versus the pore water pressure, there is practically no hysteresis for the pressure increasing period and the pressure decreasing period. The second is a type of rock mass landslide that moves mainly in the snow melting period. The curve of the velocity of displacement versus the pore water pressure indicates hysteresis for the pressure increasing period and the pressure decreasing period. The third type is the detritus landslide consisting of pelitic-schist. In this type, the displacement peak occurs after the pressure peak.<br>(2) Comparing the rock mass landside and the detritus landslide, there are some differences in the mechanism of the slip surface and the form of the displacement of the landslide. These differences are due to the two different ways of transmitting the pore water pressure to the slip surface and the related differences in features and mechanisms.

収録刊行物

  • 地すべり

    地すべり 36 (4), 22-31, 2000

    公益社団法人 日本地すべり学会

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