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http://dx.doi.org/10.7474/TUS.2012.22.5.346

Experimental Study on the Elastic Constants of A Transversely Isotropic Rock by Multi-Specimen Compression Tests Report 2 - Statistical Evaluation and Determination of True Values of Elastic Constants  

Park, Chulwhan (Korea Institute of Geoscience and Mineral Resources)
Park, Chan (Korea Institute of Geoscience and Mineral Resources)
Jung, Yong-Bok (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Tunnel and Underground Space / v.22, no.5, 2012 , pp. 346-353 More about this Journal
Abstract
Multi-specimen uniaxial compression test has been carried out in order to find the method to determine the five independent elastic constants from a single standard specimen of a transversely isotropic rock. Total 35 specimens of 7 different angles from a large block of rhyolite presenting the flow structure obviously are used in tests. This second report is to focus on the statistical evaluation of measured strains and analyzed elastic constants. And the determination of their true or near-true values is discussed. As the result of RSD analysis, it turns out that the reliability of measured strains is sufficiently obtained and Saint-Venant approximation is well applicable except 15 degree angled specimen in tests. RSD is decreasing on the increase of the angle of anisotropy. This tendency may be caused not only by the decreasing of the deviation of measured strains, but also by the better applicability of Saint-Venant approximation on the increase of angle. It can be concluded that the analyzed values are considered the near-true ones of five independent constants on the high reliability. But the variation of the apparent Young's modulus expected by these values is not proved to match the measured tendency. It is inferred that the factor to decrease the apparent Young's modulus and/or to increase the shear strain, is present in the test or in the nature of the anisotropy in consideration of this inconsistency.
Keywords
Transversely isotropic rock; Independent elastic constants; Multi-specimen test; Saint-Venant approximation;
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Times Cited By KSCI : 1  (Citation Analysis)
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