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Size Effect in Strength Assessment by Indentation Testing on Rock Fragments
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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.
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