Rock anisotropy is one of the important parameters that should be studied in the behavior of rock under stress and to determine the toughness of rock material. Acoustic emission method is a suitable method for failure behavior mapping. Using this method, different stages of failure can be identified and in projects, the necessary precautions should be taken before the final failure. The Crack Chevron Notch Brazilian Disk method proposed by the International Society of Rock Mechanics was selected as the method for determining the fracture toughness in this study. To determine the tensile strength, Chevron notch Brazilian disk specimens with a diameter of 54 mm and 74 mm and a Semi Circular Brzilian disk with central notch specimens with a diameter of 94 mm were used and the anisotropy angle of these specimens from zero to 90 degrees with a difference of 15 degrees applied chang to the loading. Numerical method was performed using Abaqus software to reduce experiments. Numerical analysis was performed in 2D and 3D. According to the results of numerical analysis, the steps of creating notches and meshes were performed in different samples (disc and semi-disc). After the studies, it was found that the trend of changes in laboratory and numerical analyzes is similar, and this indicates the accuracy of the results. Due to laboratory conditions, the amount of toughness obtained from experimental analysis is less than numerical analysis. The reason for this decrease was laboratory conditions, errors caused by the user and devices, type of sampling, test environment. Rise angle parameters and average frequency can be used to determine the mechanisms of micro-cracks in the sample. From the results of this research, it can be concluded that first the tensile micro-cracks are created in the specimens and then after a while the number of tensile micro-cracks decreases and the number of shear micro-cracks increases. If the ratio of the average frequency changes according to the Rise angle parameters is more than 7.37, the shear mode and for the ratio less than 0.15 will be the tensile mode. Between these two values is the mixed mode.
