Abstract: The sandy slate samples are taken from the Xuefeng mountain tunnel rock. To study the effect of micro-bedding on strength properties and deformation characteristics of samples, a series of uniaxial and triaxial compressed tests are carried out with MTS815 Flex GT rock mechanics test system. The experiment results show that mechanical properties of the rock is obvious anisotropy. The stress-strain curves display unstable broken feature when the bedding parallels to axial stress (angle 0°) and failure faces development along the bedding. Softening rapidly happened after peak when the bedding is perpendicular to axial stress(angle 90°) and failure faces belongs to shear failure. The numerical results of uniaxial test show that compression strength, elastic modulus and deformation modulus of angle 0° is 20%, 50% and 80% higher separately than them of angle 90°. The results of triaxial test show the principal stress difference of them is close in the peak intensity; elastic modulus and deformation modulus of angle 0° is 6% and 20% higher than them of angle 90°. Confining pressure of triaxial tests has weakening effects on anisotropic features of the sandy slate. These conclusions reveal the sandy slate possesses anisotropic mechanical properties and offers important reference to solve practical engineering problems

Key words: sandy slate, micro-bedding, mechanics characteristic, anisotropy, experimental study