Tests of the Interface between Sand Steel in the Simple Shear Apparatus

  • Kishida H
  • Uesugi M
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Abstract

The simple shear apparatus is used for tests on the interface between soil and other construction materials. A comparison was made of its advan- tages and disadvantages, as well as of the test results for sandsteel interfaces, with respect to three other types of interface testing apparatuses: the direct shear, the annular shear and the ring torsion types. A simple shear apparatus is less sophisticated than a ring torsion apparatus mainly in the non-uniformity of the stress distributions, but it can be used with much less technical diffr- culty. Good agreement was observed between the results from the three types on the correlations between the coefficient of friction and the rough- ness of the steel surface. The sliding displacement measured in simple shear tests showed good agree- ment with the observation in the ring torsion type of apparatus, but the tangential displacement in the direct shear test was larger, possibly because it included the displacement due to the strain in the sand mass inside the shear box. A modification was made to the evaluation of the steel surface rough- ness. The modified roughness was divided by the 50% diameter of the sand and called the normal- ized roughness. A good correlation was obtained between the coeffkient of friction and the normal- ized roughness over a wide range of sand diam- eters. KEYWORDS:

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  • Pile Design

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Authors

  • H Kishida

  • M Uesugi

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