Strength Anisotropy of Berea Sandstone: Results of X-Ray Computed Tomography, Compression Tests, and Discrete Modeling

摘要: Berea sandstone in northern Ohio is a transversely isotropic rock. X-ray CT investigations showed that its internal structure composed of cross-bedded loose layers and relatively thin tightly packed called bedding. Uniaxial compression tests were performed on different specimens. The uniaxial compressive strength (UCS) decreases with increasing porosity, also inclination the bedding plane relative to horizontal line. Two-dimensional discrete modeling was applied investigate micromechanical behavior sandstone. Different microparameters assigned tight layers. UCS simulation results agree well experimental results. At peak stress, cracks almost always develop regardless orientation. In addition, both normal shear occur earlier for specimens higher angle. No correlations found between angle failure planes orientation planes. are not weak anisotropy significant compared other rocks such as shale, gneiss, schist.