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Detail Study of the Aratozawa Large-Scale Landslide in Miyagi Prefecture, Japan Open image in new window

  • Hendy SetiawanEmail author
  • Kyoji Sassa
  • Kaoru Takara
  • Hiroshi Fukuoka
Conference paper

Abstract

The deep large-scale landslide near Aratozawa Dam in Miyagi Prefecture of Japan was occurred in 2008 and still the initiation mechanism and motion behavior were not explained in detail up to now. This paper aims to report briefly the detail study of the Aratozawa landslide. We conducted several experiments to test the Aratozawa samples using the newest version of the undrained dynamic loading ring shear apparatus. As reported by Sassa et al. (2014), the ring shear apparatus was designed with the single central axis-based for the normal stress loading system, with the normal stress and pore pressure measurement capacities of up to 3.0 MPa. The friction coefficient, shear displacement at the start and end of shear strength reduction, mobilized friction angle and steady state shear resistance of the Aratozawa samples were obtained from the ring shear tests. Experiments results implied that the shear strength reduction in progress of shear displacement of the Aratozawa samples was caused not only by the earthquake but also by factor of the initial pore pressure (Setiawan et al. 2014, 2016). Further analysis has been conducted by occupying shear parameters of soil failure resulted from experiment as a critical inputs for the LS-RAPID geotechnical simulation. LS-RAPID landslide simulation model is used to observe the overall process of landslide phenomena started from initiation to moving process. The Aratozawa landslide was successfully simulated using LS-RAPID model which involves the pore pressure increase, seismic loading, and landslide volume enlargement during traveling process. However, factor of the reservoir and its relation to the groundwater and bedrock is still needed to analyze in further.

Keywords

Aratozawa landslide Shear strength reduction Pore pressure LS-RAPID model Ring shear tests 

Notes

Acknowledgements

The assistance from Japan Conservation Engineering and Japan Forestry Agency is gratefully acknowledged. The authors would like to thank Kawanami Akiko from Ministry of Agriculture, Forestry and Fisheries of Japan for her kind assistance during site investigation. This landslide research is supported by the Global Survivability Studies Program of Kyoto University (A Leading Graduate School Program of MEXT). The undrained ring shear apparatus ICL-2 version is developed by the International Consortium on Landslides (ICL) as a part of SATREPS (Science and Technology Research Partnership for Sustainable Development Program of the Government of Japan) for Vietnam project in 2012–2017.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Hendy Setiawan
    • 1
    Email author
  • Kyoji Sassa
    • 2
  • Kaoru Takara
    • 1
  • Hiroshi Fukuoka
    • 3
  1. 1.Disaster Prevention Research Institute (DPRI), Kyoto UniversityUjiJapan
  2. 2.International Consortium on Landslides (ICL)KyotoJapan
  3. 3.Research Institute for Natural Hazards and Disaster RecoveryNiigata UniversityNiigataJapan

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