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Landslides

, Volume 16, Issue 1, pp 155–164 | Cite as

Recent rainfall-induced rapid and long-traveling landslide on 17 May 2016 in Aranayaka, Kagelle District, Sri Lanka

  • Khang DangEmail author
  • Kyoji Sassa
  • Kazuo Konagai
  • Asiri Karunawardena
  • R. M. S. Bandara
  • Kiyoharu Hirota
  • Qinwen Tan
  • Nguyen Duc Ha
Recent Landslides
  • 153 Downloads

Abstract

A rapid and long-traveling landslide was triggered at Aranayaka, Kegalle district, Sri Lanka on 17 May 2016 by exceptionally heavy rainfall associated with a slow-moving tropical cyclone. The precipitation that accumulated within the last 3 days from May 14 to 17 reached 446.5 mm. The landslide mass traveled over an approximately 2-km distance killing 127 people and destroying 75 houses. To deduce the failure mechanism of the Aranayaka landslide, shear behavior of two samples taken from the initial landslide area were examined through ring-shear tests. The first sample (S1) was taken from the weathered soil layer on the left scarp of the landslide. The second sample (S2) was taken from the weathered granitic gneiss at the bottom of the depression in the middle part of the landslide area. The layer was affected by intense tectonic crushing and subsequent deep weathering. A high value of shear resistance at steady state was measured on the sample S1 while the sample S2 obtained a much smaller steady state shear resistance. This indicated that the sliding surface of the landslide was located in the weathered granitic gneiss associated with the sample S2. A series of computer simulations of this landslide was then carried out given the soil parameters from the ring-shear tests and pore-water pressure ratio estimated from the rainfall records using the “SLIDE” model. In the simulation, the landslide initiated from the middle part of the source area, close to the location from where sample S2 was taken. Moreover, the time of occurrence from the simulation was similar to that observed in the real event. This is a very important information to assess further rapid landslides in areas with similar conditions. This study also indicates the importance of selecting soil samples and suggests that the ring-shear apparatus and computer simulations are effective tools to reproduce the process of landslides.

Keywords

Aranayaka landslide Rainfall-induced landslide Ring shear apparatus Computer simulation LS-RAPID Landslide risk assessment 

Notes

Acknowledgements

The authors would like to acknowledge the contribution of Prof. Hiroshi Fukuoka from the Research Institute for Natural Hazards and Disaster Recovery of Niigata University, Japan who joined the Aranayaka landslide investigations in Sri Lanka and gave valuable guidance on this research. Prof. Fukuoka was expected to be one of the group leaders of the planning SATREPS project but unfortunately, he passed away due to a heart attack during his landslide field trip in Bhutan in June 2018. The authors offer their deepest condolences to all of his many friends and loved ones. The authors are also very grateful to Dr. Beena Ajmera at North Dakota State University who revises the English and gives comments to improve this paper.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.International Consortium on LandslidesKyotoJapan
  2. 2.VNU University of ScienceVietnam National University, HanoiHanoiVietnam
  3. 3.National Research Building OrganisationColombo 5Sri Lanka
  4. 4.China University of GeosciencesWuhanChina
  5. 5.Disaster Prevention Research InstituteKyoto UniversityKyotoJapan

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