韓国ソウル郊外の花崗岩と片麻岩山地における土層構造と表層崩壊形状に与える基盤岩質の影響  [in Japanese] The Effects of Bedrock Lithology on Soil Layer Structure, Slip Depth and Slope Angle of Shallow Soil Slips on Granite and Gneiss Slopes in Korea  [in Japanese]

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Author(s)

Abstract

We studied the relations between the lithological properties of bedrock, soil layers, and dimensions of soil slips (depth and slope angle) in slopes on Jurassic granite and Precambrian gneiss in the suburbs of Seoul, Republic of Korea. The slope angle before slippage and the average depth at which slippage initiates are estimated to be about 35-40° and 70-90 cm in granite. The values for gneiss scars are 27-33° and 140-190 cm. Regolith (weathering products) is coarse on slopes underlain by granite and fine on slopes underlain by gneiss, reflecting the grain size of the minerals in the underlying bedrock. Soil layers at the slip (shearing) plane on the granite slope are coarser grained with a larger angle of internal friction (φ) and a smaller cohesion (<I>c</I>) compared to soil layers on the gneiss slope. A slope stability analysis indicates that these properties of soil, themselves derived from weathering, control the difference in dimensions of soil slips found between granite and gneiss.

Journal

  • Journal of Geography (Chigaku Zasshi)

    Journal of Geography (Chigaku Zasshi) 111(3), 416-425, 2002-06-25

    Tokyo Geographical Society

References:  28

Cited by:  1

Codes

  • NII Article ID (NAID)
    10008701922
  • NII NACSIS-CAT ID (NCID)
    AN00322536
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0022135X
  • NDL Article ID
    6197289
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-169
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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