Brief note on the influence of shape and percentage of gravel on the shear strength of sand and gravel mixtures

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The paper records the influence of the shape and the percentage of gravel on the shear strength/frictional angle of sand and gravel mixtures using direct shear tests. The shear strength is mainly derived from the frictional forces developed due to sliding and interlock; they depend on the maximum particle size and shape, the uniformity coefficient, density and the effective normal stress. As the size of material in a mixture is variable, the shear strength also depends upon the ratio of the specimen diameter to the maximum particle particle size. In this study, tow different shapes of limestone were used, angular and rounded, and the maximum gravel size was 6.3 mm in diameter. Air-dried samples were used in the tests. It is concluded that the shape and percentage of gravel have an important influence on the shear strength properties.

Original languageEnglish
Pages (from-to)321-323
Number of pages3
JournalBulletin of Engineering Geology and the Environment
Issue number4
Publication statusPublished - Nov 22 2001
Externally publishedYes



  • Granular soils
  • Particle shape
  • Particle size
  • Shear strength

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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