Abstract
We examined the azimuthal distributions of circumferential strain, radial deformation, and Vp, Vs¶, and Vs⊥ of seismic waves traveling through a specimen of granite as it was deformed to faulting under the uniaxial conditions. All measurements were made within the plane perpendicular to the loading axis. It is concluded that anisotropy in physical properties of granite arises from the inherent microcrack fabric and anisotropic ordered alignment of microcracks extended or produced during loading (dilatancy-induced-fabric). Dilatancy anisotropy is much higher than anisotropy due to the natural fabric. The symmetry of physical properties can be characterized by the symmetry of dilatancy-induced-fabric. Based on the Neumann's principle in crystallography, we can simulate the mechanical behavior of granite with dilatancy-induced-fabric as an orthorhombic crystal.
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