弾性的対称性未知の岩石の弾性定数決定に関する研究

概要

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Oriented cracks and/or oriented joints in rocks produce anisotropic elasticity. When the rock has anisotropic elasticity, One must know more than two elastic constants to describe fully the elastic bebavior of rocks under stress. In an anisotropic body, there are twenty-One elastic constants with respect to an arbitrary coordinate system. When a material has some sort of symmetry, a number of non-Zeroelements, With respect to the symmetryaxes, Canbereduced. Ingeneral, the fullin formation of elastic symmetry has to bekrlown, because the elastic constants of rock-for mingminerals and rocks are determindby measuring elastic properties with respect to the elastic symmetry. In this study, it was tried to determine twenty-One elastic constants of anisotropic rocks, and to find symmetry axes of the rock, by using elastic wave velocities propagat ing in various directions The calculated elastic constants and the axes of symmetry of Oshima granite agreed well with the published results which were determined in the assumpti or of orthorhombic elasticity with respect to the planes of oriented cracks.
1991-02-15