Geotechnical Perspectives of Landslide Mechanism in Serpentine Zone

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  • 蛇紋岩地すべりの発生機構に対する地盤工学的検討
  • ジャモンガン ジスベリ ノ ハッセイ キコウ ニ タイスル ジバン コウガクテキ ケントウ

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Abstract

This paper discusses landslide mechanism in serpentine dominated areas from geotechnical and mineralogical points of view. It first introduces typical features of landslide distribution in the serpentine zone, which is then supported by the discussion encompassing shear strength and mineralogical properties of the clay material involved in inducing serpentine zone landslides. The angles of shear resistance for the weathered serpentine clay samples were found to be comparatively high, which often does not lead to land sliding in gentle slopes, so the chances of smectite or expansive chlorite originated from other rock types being the cause of land sliding were found to be higher. For this reason, comparatively gentle serpentine slopes usually slide through the planes of boundary with other rock types. The dissolution tests on fine powder samples of serpentine revealed the influence of brucite, and the angles of shear resistance decrease notably with the release of ions. Finally, the shear strength and elemental analysis tests on the collected landslide clay samples revealed the influence of chemical weathering on decreased shear strength of clays.

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