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The discontinuous deformation analysis(DDA)method is adopted to numerically simulate the dynamic Brazilian splitting test of rock.When trapezoid dynamic compressive loads with different amplitudes are applied to the rock disk,the splitting failure process of the disk shows different features and forms different ultimate failure patterns.It is indicated that the failure pattern and failure mechanism of rock under dynamic loading is closely related to the propagation of the stress waves in the rock.The numerical simulation results are beneficial for the study of the failure pattern and failure mechanisms resulting from the propagation of stress waves in rock-like materials.