In-situ torsional shear test for rock masses, which was proposed by the authors, can be used to obtain mechanical properties of anisotropic rocks by evaluating stress distributions on the top of hollow cylindrical specimen by separate bi-directional load cells. For developing this testing method, transversely isotropic elastic constitutive model is assumed, and elastic solutions under an isotropic consolidation and a torsional shearing are calculated. The results demonstrated the following three conclusions: the directions of plane of isotropy can be determined by directions of three principal strains calculated from six strain components measured on the lateral side of the specimen during isotropic consolidation; stress distributions change in a trigonometric function to the circumferential direction during torsional shearing because anisotropic specimen does not necessarily satisfy an axi-symmetry condition; five elastic parameters of transversely isotropic rocks can be obtained by analysis of test results using both strain responses during isotropic stress consolidation and stress distributions during torsional shearing.

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