Abstract: The bonding interface of two intact rocks bonded by epoxy adhesive is taken as an artificial joint, the shearing strength characteristics of the artificial joint is obtained by direct shearing tests, and the behaviors of intact sandstone specimen and sandstone specimen with the single artificial joint (the angle between the joint plane and the minor principal stress are 0°, 30°, 60° and 90°, respectively) are analyzed based on the triaxial test results. The results show that the shearing failure mode of the artificial joint shows brittleness damage in the direct shearing tests, and the shear strength meets the Mohr-Coulomb theory. The failure modes and Young’s modulus of intact rocks are similar under different confining pressures (2.5, 5 0 and 7.5 MPa), and the peak strength increases with the increasing confining pressure. The failure modes, Young’s modulus and peak strengths of the sandstone specimen with the single artificial joint of different angles are different under the contact confining pressure of 2.5 MPa, the curve of peak strength and joint inclination angle is in the shape of anti-tick (), and the strength of 60° jointed specimen is only 19.7% of that of intact rocks, indicating that the angle of the artificial joint significantly affects the characteristics of rock mass. 3D calculation formulas for the section internal force through the center of the column specimen are derived. Theoretical analyses of the failure modes of intact rocks and 60° jointed specimen are consistent with the experimental results. The matching degree of theoretical analyses and experimental results is higher than that by the traditional 2D calculation formula.