Undrained shear strength of partially saturated sand in triaxial tests

  • Toshiyuki Kamata Chemical Grouting Co., Ltd., Tokyo, Japan
  • Yoshimichi Tsukamoto Tokyo University of Science, Chiba, Japan
  • Kenji Ishihara Tokyo University of Science, Chiba, Japan

Abstract

The undrained shear strength of partially saturated sand is examined based on a series of undrained triaxial compression and extension tests on Toyoura sand. The effects of partial saturation, density, and triaxial compression/extension modes are discussed in detail. The conditions of “flow” and “no flow” are categorised in terms of contractive and dilative behaviours. The threshold values of the undrained shear strength ratio dividing “flow” and “no flow” are found to be independent of the B-value and triaxial compression/extension modes. The empirical relations of the B-value against the initial state ratio rc and the undrained shear strength ratio Sus/p’c are discussed in detail.

References

Ishihara, K., Tsukamoto, Y. and Kamada, K. (2004) “Undrained behaviour of near-saturated sand in cyclic and monotonic loading”. Proc. International Conference on Cyclic Behaviour of Soils and Liquefaction Phenomena. Bochum. Germany. 31 March – 02 April 2004: Cyclic Behaviour of Soils and Liquefaction Phenomena (ed. Th. Triantafyllidis): 27 – 39. DOI: https://doi.org/10.1201/9781439833452.ch4

Tsukamoto, Y., Ishihara, K., Nakazawa, H., Kamada, K. and Huang, Y. (2002) “Resistance of partly saturated sand to liquefaction with reference to longitudinal and shear wave velocities”. Soils and Foundations, 42(6): 93 – 104. DOI: https://doi.org/10.3208/sandf.42.6_93

Fredlund, D.G. and Rahardjo, H. (1993) “Soil mechanics for unsaturated soils”. A Wiley-Interscience Publication. John Wiley & Sons. New York. DOI: https://doi.org/10.1002/9780470172759

Skempton, A.W. (1954) “The pore pressure coefficients A and B”. Geotechnique, 4(4): 143 – 147. DOI: https://doi.org/10.1680/geot.1954.4.4.143

Ishihara, K. (1993) “Liquefaction and flow failure during earthquakes”. Geotechnique, 43(3): 351–415. DOI: https://doi.org/10.1680/geot.1993.43.3.351

Ishihara, K., Tsukamoto, Y. and Nakayama, S. (1999) “Flow-type failure of slopes based on behaviour of anisotropically consolidated sand”. Slope Stability Engineering. Yagi, Yamagami & Jiang (eds). Balkema. 3 – 12.

Tsukamoto, Y., Ishihara, K. and Shibayama, T. (2004) “Evaluation of undrained flow of saturated sand based on triaxial tests”. CD Proceedings of 3rd International Conference on Continental Earthquakes. Beijing. China.

Published
2009-03-31
How to Cite
Kamata, T., Tsukamoto, Y., & Ishihara, K. (2009). Undrained shear strength of partially saturated sand in triaxial tests. Bulletin of the New Zealand Society for Earthquake Engineering, 42(1), 57-62. https://doi.org/10.5459/bnzsee.42.1.57-62
Section
Articles