, 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


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.


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



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).


  1. Arthur, JRF, Dunstan, T, Al-Ani, QAJL, & Assadi, A (1977) Plastic deformation and failure in granular media. Geothechnique 27, No. 1, 53–74Google Scholar
  2. Bishop, AW, Green, GE, Garga, VK, Andersen, A, & Browns, JD (1971) A new ring shear apparatus and its application to the measurement of residual strength. Geotechnique 21, No.4, 273–328Google Scholar
  3. Bowles, JE (1978) Engineering Properties of Soils and Their Measurement, 2nd edition. McGraw-Hill International Book Company. p. 213 Google Scholar
  4. Broemhead (1979). A simple ring shear apparatus. Ground Engineering, Vol.12, No.5, 4–44Google Scholar
  5. Casagrande, A (1971) On liquefaction phenomenon. Geotechnique, Vol.21, No.3, 19–202Google Scholar
  6. Castro, G (1969) Liquefaction of sands. Ph.D. dissertation, Harvard UniversityGoogle Scholar
  7. Finno, RJ, Harris, WW, Mooney, MA, Viggiani, G, (1997) Shear bands in plane strain compression of loose sand. Geotechnique 47, No. 1, 149–165Google Scholar
  8. Fukuoka, H (1991) Variation of the friction angle of granular material in the high-speed high-stress ring shear apparatus – Influence of re-orientation, alignment and crushing of grains during shear. Bulletin of the Disaster Prevention Research Institute, Vol.41, 243–279Google Scholar
  9. Han, C, Vardoulakis, IG (1991) Plane-strain compression experiments on water-saturated fine-grained sand. Geotechnique 41, No.1, 49–78Google Scholar
  10. Hungr, O, Morgenstern, NR (1984) High velocity ring shear tests on sand. Geotechnique 34, No.3, 415–421Google Scholar
  11. Hutchinson, JN, Bhandari, RK (1971) Undrained loading, a fundamental mechanism of mudflows and other mass movement. Geotechnique 21, No.4, 353–358Google Scholar
  12. Ishihara, (1993) Liquefaction and flow failure during earthquake. Geotechnique, 43 (4), 73–89Google Scholar
  13. Lupini, JF, Skinner, AE, Vaughan, PR (1981) The drained residual strength of cohesive soils. Geotechnique 31, No.2, 181–213Google Scholar
  14. Mandl, G, de Jong, LNJ, Maltha, A (1977). Shear zones in granular material. An experimental study of their structure and mechanical genesis. Rock Mechanics 9, 95–144Google Scholar
  15. Morgenstern, NR, Tchalenko, JS (1967) Microscopic structures in kaolin subjected to direct shear. Geotechnique 17, 309–328Google Scholar
  16. Okada, Y (2002) A study on the potential for rapid flow phenomenon. Ph.D. dissertation, Kyoto University. JapanGoogle Scholar
  17. Poulos, SJ (1981) The steady state of deformation. Journal of Geotechnical Engineering Division ASCE, 107 (GT 5), 553–562Google Scholar
  18. Roscoe, KH, Schoefield, AN (1958) On the yielding of soils, Geothechnique. Vol.VII, 25–53Google Scholar
  19. Roscoe, KH (1970) Tenth Rankin Lecture. “The influence of strains in soil mechanics”. Geotechnique 20, No.2, 129–170Google Scholar
  20. Saada, AS, Liang, L, Figueroa, JL, Cope, CT (1990) Bifurcation and shear band propagation in sands. Geotechnique 49, No.3, 367–385Google Scholar
  21. Sassa, K (1984) The mechanism starting liquefied landslides and debris flows. Proc. 4Th International Symposium on Landslide, Toronto, Canada, Vol.2, 349–354Google Scholar
  22. Sassa, K (1985) The mechanism of debris flows. In Proceedings of the 11th International conference on Soil Mechanics and Foundation Engineering. San Francisco, California, Vol.3, A.A. BALKEMA/Rotterdam/Boston 1173–1176Google Scholar
  23. Sassa, K (1986) The mechanism of unsaturated debris flow such as the Ontake debris flow, 1983, in Japan. Annals of Disaster Prevention Research Institute, Kyoto University, No.29B-1, 315–1176Google Scholar
  24. Sassa, K (1996). Prediction of earthquake induced landslides, Special lecture for 7th International symposium on landslides, “Landslides”, Vol.1, Balkema, p.115–132Google Scholar
  25. Sassa, K. (1997) A New intelligent type dynamic loading ring shear apparatus. Landslide News (Japanese Landslide Society), No.10, p. 33Google Scholar
  26. Sassa, K. (2000) Mechanism of flows in granular soils. GeoEng 2000, Vol.1: Invited Papers, 1671–1702Google Scholar
  27. Sassa K, Wang GH, Fukuoka H, (2003) Performing undrained shear test on saturated sands in a new intelligent ring shear apparatus. ASTM Geotechnical Testing Journal. Vol.26, No.3, 257–265Google Scholar
  28. Tika, TE, Vaughan, PR, Lemos, LJLJ (1996) Fast shearing of pre-existing shear zones in soil. Geotechnique 46, No.2, 197–233Google Scholar
  29. Vermeer, PA (1990) The orientation of shear bands in biaxial tests. Geotechnique 40, No.2, 223–236Google Scholar
  30. Wang FW (1998) An Experimental study on grain crushing and excess pore pressure generation during shearing of sandy soils- a key factor for rapid landslide motion. Ph.D. dissertation, Kyoto University JapanGoogle Scholar
  31. Wang, G and Sassa, K (2002) Post mobility of saturated sands in undrained load-controlled ring shear tests. Canadian Geotechnical Journal, Volume 39. Number 4, 821–837Google Scholar

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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