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The loading effects on the mechanical behaviors of transversely isotropic rock

WithZ.Y. Liu, M.L. Xiao, J.F. Xue, L.L. Li, H.Q. Xie, J.D. He

Bonded-particle discrete element (2D) modeling with embedded smooth joints is used to simulate the mechanical behavior of transversely isotropic rocks under uniaxial loading conditions. A correction factor χ is introduced to consider the impact of ball overlapping on weak plane behavior. The Uniaxial Compressive Strength (UCS), failure patterns and elastic modulus of quartz mica schist samples with weak planes of different dip angles are studied, and compared with reported experiment results. The effect of loading rate on anisotropic elasticity, UCS, and failure patterns of the samples is also studied under six loading rates: 0.001 m/s, 0.005 m/s, 0.01 m/s, 0.05 m/s, and 0.1 m/s. Results show that the correction factor χ can greatly reduce the effect of ball overlapping on the UCS and stiffness of the samples. The loading rate has little effect on the strength and stiffness of the samples, but does affect the crack development in the samples.