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Landslides

, Volume 1, Issue 2, pp 101–112 | Cite as

Evolution of Shear-Zone Structure in Undrained Ring-Shear Tests

  • Muhammad Wafid Agung
  • Kyoji Sassa
  • Hiroshi Fukuoka
  • Gonghui Wang
Original Paper

Abstract

Undrained monotonic torque-controlled tests were conducted on fine-grained silica sand to study the shear-deformation process in granular materials by using a ring-shear apparatus. Shear-zone structures at various stages in the undrained shear tests were observed during a series of tests in which the experiments were terminated at different shear displacement. For “undisturbed” samples, the shear zone was only developed during the post-failure stage and its thickness increased with progressed shearing. First the shear surfaces had undulating and asymmetric structures; later they gradually became smooth and parallel to the shearing direction. During this process, pore water pressure was generated, and the effective friction angle decreased correspondingly. Generally, the shear zone could be divided into three parts: the compacted core, the adjacent zone above the core, and the adjacent zone below the core. Grain-size analysis on the sample from the shear zone revealed that grain crushing occurred during each stage and the extent of grain crushing differed for different shear stages. An interesting phenomenon occurred during the steady-state deformation where the coarse and fine particles within the shear zone segregated during motions and a parallel orientation structure developed. These results are helpful for understanding the mechanism of progressive failure in granular material as well as the rapid landslide with long runout study.

Keywords:

Undrained torque-controlled Shear zone Core Segregation Structure Rapid landslides Ring shear tests 

Notes

Acknowledgements

The writers gratefully acknowledge the valuable review and comments by Prof. Roy C. Sidle, Disaster Prevention Research Institute, Kyoto University.

This study is a part of the project “Aerial Prediction of Earthquake and Rain-Induced Flow Phenomena (APRIF)”, which is supported by the Special Coordinating Fund for Promoting Science and Technology of the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT), and also is a part of the M101 Project, “Areal Prediction of Earthquake and Rain Induced Rapid and Long-traveling Flow Phenomena” (APERITIF), of the International Programme on Landslides (IPL) supported by the International Consortium on Landslides (ICL).

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Muhammad Wafid Agung
    • 1
    • 3
  • Kyoji Sassa
    • 2
  • Hiroshi Fukuoka
    • 2
  • Gonghui Wang
    • 2
  1. 1.Directorate of Geology and Mining EnvironmentBandung Indonesia
  2. 2.Research Centre on Landslide, Disaster Prevention Research InstituteKyoto UniversityKyotoJapan
  3. 3.Graduate School of ScienceKyoto UniversityKyotoJapan

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