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Natural Hazards

, Volume 59, Issue 1, pp 347–365 | Cite as

Characteristics of landslides induced by a debris flow at different geology with emphasis on clay mineralogy in South Korea

  • Gyo-Cheol Jeong
  • Kyeong-Su Kim
  • Chang-Oh Choo
  • Jong-Tae Kim
  • Man-Il KimEmail author
Original Paper

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.

Keywords

Landslide Debris flow Mineralogy XRD SEM Laser analyzer 

Notes

Acknowledgments

This work was supported by the Korea Research Foundation Grant funded by the Korean Government (KRF-2008-313-C00929).

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Gyo-Cheol Jeong
    • 1
  • Kyeong-Su Kim
    • 2
  • Chang-Oh Choo
    • 1
  • Jong-Tae Kim
    • 1
  • Man-Il Kim
    • 3
    Email author
  1. 1.Department of Earth and Environmental SciencesAndong National UniversityAndongKorea
  2. 2.Geologic Hazards DepartmentKorea Institute of Geoscience and Mineral ResourcesDaejeonKorea
  3. 3.Institute of Infrastructure SafetyKorea Infrastructure Safety and Technology CorporationGoyang-CityKorea

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