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Experimental Study on the Elastic Constants of A Transversely Isotropic Rock by Multi-Specimen Compression Tests Report 1 - Focus on Data Analysis  

Park, Chul-Whan (한국지질자원연구원 지구환경연구본부)
Park, Chan (한국지질자원연구원 지구환경연구본부)
Synn, Joong-Ho (한국지질자원연구원 지구환경연구본부)
Jung, Yong-Bok (한국지질자원연구원 지구환경연구본부)
Publication Information
Tunnel and Underground Space / v.20, no.6, 2010 , pp. 455-464 More about this Journal
Abstract
The variations of the uniaxial compressive strength, the strains and the elastic constants with respect to the angle of anisotropy are analyzed in order to investigate the characteristics of a transversely isotropic rock experimentally. Total 35 specimens of 7 different angles from a large block of rhyolite presenting the flow structure obviously are used in tests. This study is composed of two reports; the elastic constants are mainly analyzed for the every individual angle in the report No. 1 and they will be discussed synthetically in the report No. 2. From the specimens of 0 and 90 degree, 4 independent elastic constants which can directly be obtained without the help of any other suggested equations, may be referred to the true values. Data variation in the strain measurements differs on the angle is analyzed. That of small angle specimens tends higher than that of large angle specimens. The relation of apparent Young’s modulus and angle is found to be M- or U-shaped. For small angle specimens, Saint-Venant approximation cannot be applied successfully on account of showing the non-monotonous increase, and E1 is analyzed out of the true value range. In the specimen of $\phi$ = 75, the deviation of strain measurement and strength are smallest and 4 all constants are analyzed in the true value range. Therefore, specimen of the angle of around 75 may become preferable if only one specimen should be used in test of a transversely isotropic rock.
Keywords
Transversely isotropic rock; Apparent Young’s modulus; Shear modulus; Saint-Venant approximation; Multi-specimen test;
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Times Cited By KSCI : 2  (Citation Analysis)
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