Size Effect in Strength Assessment by Indentation Testing on Rock Fragments

• Author(s) / Creator(s)

  • M. Haftani
  • A. Nouri
  • M. Moosavi
  • B. Bohloli
  • M.R. Maleki Javan

• Size DependencyIn this study, uniaxial compressive strength (UCS) of limestone rocks was estimated by indentation testing
  on small rock fragments. Here, the effects of rock fragment dimensions (particularly area and thickness) on
  indentation indices were studied. The investigation shows size dependency of the conventional indentation
  parameters. The results indicate the fragment area normal to loading direction has little effect on the indentation
  indices, while the sample thickness has major influence on the results. To reduce size dependency, the results of
  indentation test were normalized by a thickness function.
  The proposed empirical equations were verified against independent data pertaining to other limestone rocks
  not used in developing the correlations, which showed agreement between the estimated and measured UCS.
  Statistical analysis was used to determine the minimum number of required indentation tests in relation to the
  project importance. This study shows that the uniaxial compressive strength of rocks can be estimated
  reasonably well from indentation testing of small rock fragments.

• Date created

  2014-01-01

• Subjects / Keywords

  • Indentation Test
  • Drill Cutting
  • Size Dependency
  • Normalized Indentation Stiffness
  • Normalized Critical Transition Force
  • Uniaxial Compressive Strength
  • Geomechanical Characterization

• Type of Item

  Article (Draft / Submitted)

• DOI

  https://doi.org/10.7939/r3-nj8g-0456

• License

  Attribution-NonCommercial 4.0 International