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A new high-stress undrained ring-shear apparatus and its application to the 1792 Unzen–Mayuyama megaslide in Japan

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Abstract

Sassa and others in the Disaster Prevention Research Institute (DPRI), Kyoto University, developed a series of undrained ring-shear apparatus to physically simulate landslide initiation and motion, from DPRI-3 (Sassa 1992) to DPRI-7 (Sassa et al., Landslides 1(1):7–19, 2004). The maximum undrained capacities in the DPRI series ranged from 300 to 650 kPa. Sassa and others in the International Consortium on Landslides (ICL) have developed a new series of undrained ring-shear apparatus (ICL-1and ICL-2) for two projects of the International Programme on Landslides (IPL-161 and IPL-175). Both projects are supported by the Science and Technology Research Partnership for Sustainable Development Program (SATREPS) of Japan. ICL-1 was developed to create a compact and transportable apparatus for practical use in Croatia; one set was donated to Croatia in 2012. ICL-2 was developed in 2012–2013 to simulate the initiation and motion of megaslides of more than 100 m in thickness. The successful undrained capacity of ICL-2 is 3 MPa. This apparatus was applied to simulate possible conditions for the initiation and motion of the 1792 Unzen–Mayuyama megaslide (volume, 3.4 × 108 m3; maximum depth, 400 m) triggered by an earthquake. The megaslide and resulting tsunami killed about 15,000 people. The Unzen Restoration Office of the Ministry of Land, Infrastructure and Transport (MLIT) of Japan systematically collected various papers and reports and published two summary leaflets: one in English in 2002 and an extended version in Japanese in 2003. Samples were taken from the source area (for initiation) and the moving area (for motion). The hazard area was estimated by the integrated landslide simulation model LS-RAPID, using parameters obtained with the ICL-2 undrained ring-shear apparatus. The estimated hazard area agrees reasonably with the landslide moving area reported in the Ministry leaflets.

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Acknowledgments

We thank the Unzen Restoration Office (Mr. Yasuyuki Satou), the Unzen Volcanic Area Global Geopark Office (Mr. Kunihisa Terai) and the Unzen Museum (Mr. Shinichi Sugimoto), as well as Dr. Hideaki Yanagisawa of Tohoku Gakuin University, Sendai and Mr. Hendy Setiawan of the Disaster Prevention Research Institute, Kyoto University for their cooperation during field investigation and sampling, and provision of various data on the Mayuyama landslide.

Development of ICL-2 is a part of the project “IPL-175: Development of landslide risk assessment technology and education in Vietnam and other areas in the Greater Mekong Sub-region”. This project was proposed by ICL and the Institute of Transport Science and Technology of the Ministry of Transport, Vietnam for the SATREPS programme, which is financed by the Japan Science and Technology Agency (JST) and the Japan International Cooperation Agency (JICA). The proposal including the development of ICL-2, and the donation of the developed apparatus to Vietnam was accepted. We acknowledge both agencies and their staffs for their support during this study.

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Authors and Affiliations

  1. International Consortium on Landslides, Kyoto, Japan

    Kyoji Sassa, Khang Dang & Osamu Nagai

  2. Graduate School of Engineering, Kyoto University, Kyoto, Japan

    Khang Dang

  3. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China

    Bin He

  4. Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan

    Kaoru Takara

  5. Sabo Frontier Foundation, Tokyo, Japan

    Kimio Inoue

Authors
  1. Kyoji Sassa
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  2. Khang Dang
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  3. Bin He
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  4. Kaoru Takara
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  5. Kimio Inoue
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  6. Osamu Nagai
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Correspondence to Kyoji Sassa.

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Sassa, K., Dang, K., He, B. et al. A new high-stress undrained ring-shear apparatus and its application to the 1792 Unzen–Mayuyama megaslide in Japan. Landslides 11, 827–842 (2014). https://doi.org/10.1007/s10346-014-0501-1

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  • DOI: https://doi.org/10.1007/s10346-014-0501-1

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