Effect of Loading Condition on Liqefaction Strength of Saturated Sand

  • Shun-ichi Sawada
Conference paper
Part of the Solid Mechanics and Its Applications book series (SMIA, volume 146)

Abstract

Liquefaction strength is, obtained by means of a cyclic triaxial test in the engineering practice. This loading procedure of a cyclic triaxial test is equivalent to the shear stress condition acting on the horizontal plane in the ground during an earthquake. This method has a disadvantage, however, that effective mean stress changes. When simulating the behavior of the level ground, the cyclic shear stress must be applied while inhibiting lateral deformation as a torsional shear test. These tests were performed. The following conclusions were obtained from a series of test result.

  1. (1)

    The result of these laboratory tests shows that the liquefaction strength defined as 7.5% shear strain in double amplitude is generally agreement between triaxial and torsional test.

     
  2. (2)

    The stress condition appears to affect the behavior of excess pore pressure and shear strain up to liquefaction strength. In particular, the behavior of the cyclic triaxial tests is different stress condition between in-situ and laboratory.

     
  3. (3)

    It was noteworthy that the minimum cyclic shear strength was observed at cyclic triaxial test that is ordinary used in small shear strain up to 7.5% in double amplitude. The main reason for this behavior is that the effective confining pressure is decrease, when the cyclic axial stress direction is extension.

     

Keywords

Crest Liquefaction 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Ishihara, K. & Yasuda S. [1975]. “Sand liquefaction in hollow cylinder torsion under irregular excitation” Soils and Foundations, JSSMFE, Vol. 15,No. 1, pp.45–59.CrossRefGoogle Scholar
  2. Ishihara, K. & Takatsu H. [1979]. “Effects of overconsolidation and Ko conditions on the liquefaction characteristics of sands” Soils and Foundations, JSSMFE, Vol. 19,No.4, pp.59–68.CrossRefGoogle Scholar
  3. Peiris, T. A. and Yoshida, N. [1996]: Modeling of volume change characteristics of sand under cyclic loading, Proc., 11th WCEE, Acapulco, Mexico, Paper No. 1087Google Scholar
  4. Sawada, S., Sakuraba, R., Ohmukai, N. & Mikami, T. [2001]. “Effect of Ko on Liquefaction Strength of Silty Sand” 4th Inter. Conf. On Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics.Google Scholar
  5. Sawada, S., Takeshima, Y. & Mikami, T. [2003] “Effect of K0-condition on liquefaction characteristics of saturated sand” Deformation Characteristics of Geomaterials. pp.511–517.Google Scholar

Copyright information

© Springer 2007

Authors and Affiliations

  • Shun-ichi Sawada
    • 1
  1. 1.Earthquake Geotechnical Engineering GroupOYO CORPORATIONIbarakiJAPAN

Personalised recommendations