Effects of Testing Conditions on Intact Rock Strength and Variability |
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Authors: | Widjojo A Prakoso Fred H Kulhawy |
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Institution: | (1) Civil Engineering Department, University of Indonesia, Depok, 16424, Indonesia;(2) School of Civil and Environmental Engineering, Hollister Hall, Cornell University, Ithaca, NY 14853-3501, USA |
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Abstract: | The strength of intact rock is a fundamental and integral part of many aspects of engineering and geologic practice. It is
necessary to understand how testing conditions influence this strength and its variability, especially for use in reliability-based
design. In this study, the effect of sample diameter and moisture content on the strength and its variability was examined
in detail. Correlations are given for assessing the effect of sample diameter on the laboratory uniaxial compressive strength
(qu), Brazilian indirect tensile strength (qt-Brazilian), and point load strength (Is), and the associated direct correlations among these tests. Correlations also are given for assessing the effect of sample
moisture content on qu, qt-Brazilian, and Is. The statistics of data scatter suggest these correlations can introduce large uncertainties. The effect of sample diameter
and moisture content on the coefficients of variation was examined subsequently, and it was found to be relatively minor. |
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