Abstract
A series of triaxial compression experiments have been conducted on dry Berea Sandstone at confining pressures of 20, 40, 60, 80, 100, and 138 MPa to examine the stress-induced compressional and shear wave anisotropies. The results indicate that a significant compressional wave anisotropy and a marked lateral shear wave birefringence develop during both dilatant brittle shear failure and during shear-enhanced compaction. These anisotropies decrease in tests at successively higher confining pressures. Compressional wave velocity anisotropy continues to increase with increasing strain during shear-enhanced compaction, an effect not observed after brittle shear failure. Polarized shear wavess parallel to the principal stress axis do not exhibit birefringence until after brittle shear failure.
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