Deformation mechanism of a shallow landslide in a snow-covered area

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  • OKAMOTO Takashi
    Department of Soil and Water Conservation, Forestry and Forest Products Research Institute
  • MATSUURA Sumio
    Department of Soil and Water Conservation, Forestry and Forest Products Research Institute
  • ASANO Shiho
    Kyusyu Research Center, Forestry and Forest Products Research Institute

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Other Title
  • 積雪地域における浅層地すべりの変形機構
  • セキセツ チイキ ニ オケル センソウ ジスベリ ノ ヘンケイ キコウ

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Abstract

This paper clarified the deformation mechanism of a shallow landslide in a Tertiary deposit with 3 to 5 meters of maximum snow depth based on the results of two years of monitoring. Landslide activity was low from spring to summer; however, it increased from autumn to the early snow season, and the extensional deformation increased with it. The creep of the landslide, which stopped briefly in midwinter, started moving at a slow speed without deformation in the snowmelt season. The following three factors were apparently involved in controlling such deformation: 1) increase in shear strength by snow load, 2) net effect of snow pack, and 3) consolidation of the sliding surface by long-term loading of snow pack.

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