Characteristics of landslides induced by a debris flow at different geology with emphasis on clay mineralogy in South Korea |
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| Authors: | Gyo-Cheol Jeong Kyeong-Su Kim Chang-Oh Choo Jong-Tae Kim Man-Il Kim |
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| Institution: | (1) Department of Earth and Environmental Sciences, Andong National University, Songchen-dong 388, Andong, 760-749, Korea;(2) Geologic Hazards Department, Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Korea;(3) Institute of Infrastructure Safety, Korea Infrastructure Safety and Technology Corporation, 315, Goyang-Daero, Ilsanseo-Gu, Goyang-City, Gyeonggi-Do, 411-758, Korea; |
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| Abstract: | Landslides induced by debris flow have been discussed in relation to the geotechnical properties of soil developed on bedrock,
together with an emphasis on the importance of mineralogy comprising precursor soils. Three areas composed of different types
of geology were compared to relate landslide with soil compositions: Precambrian gneiss (Jangheung area), Jurassic granite
(Sangju area), and Tertiary sedimentary rocks composed of shale and mudstone (Pohang area) in Korea. X-ray diffraction for
mineral identification and quantitative analysis, Scanning Electron Microscope for observation of microtexture, and laser
size analysis for very fine particles ranging from micrometer were performed, with conventional measurements of particle size,
porosity, density, permeability, and consistency for the soils. Soils at landslide sites containing a large amount of finer
particles have higher uniformity and gradation coefficients, but lower consistency than those at non-landslide sites. Landslide
areas are characterized by higher porosity and lower density. Soil from the gneiss area shows a high plasticity index while
that of mudstone has high water content. Main clay minerals contained in soils of the sites where landslides took place are
illite, chlorite, kaolinite, and montmorillonite. Mineralogical information on the constituents and microtexture of soils
aids in better understanding the causes and patterns of landslide, together with mechanical properties of soils. |
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