Anisotropy is one of the mechanical properties to be considered as a factor in the design of underground structures. The object of this paper is to determine five independent elastic constants of a transversely isotropic rock experimentally. Tests are successfully accomplished and data are acceptable over all, for total 35 specimens of 7 different angles from a large block of rhyolite from Haenam area. Saint-Venant approximation is used in data analysis of the every individual angle. Near-true values of E1, E2, V1 and V2 can be directly measured from the two special specimens and G2 can be obtained from the five specimens of inclined angles. Two values of tangential modulus on the anisotropic plane, averaged G2 and G2-sv, are almost same each other within 6 % of difference. And test data of the apparent Young's modulus can be referred as a monotonous increasing. From these results, it is proved that SV approximation may be very applicable for rhyolite. It is proposed that displacement by sliding on account of the excess tangential stress on a transversely isotropic plane may be assumed in this paper to explain a wide difference in the longitudinal strain. Sliding model can be one of the future studies to answer why Saint-Venant approximation may not become well applicable in the analysis of transversely isotropic rocks.

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