Abstract: The weak rock-concrete interface has a significant influence on the underground supporting structure.Seven combined rock-concrete specimens with different inclination angles were prepared, and uniaxial and graded loading creep tests were conducted. The results show that the compressive strength of the combined specimens shows W-typed fluctuation with the increase of the interface inclination angle. The compressive strength is the largest when the interface inclination angles are 0°, 45°, and 90°, and is smallest when the interface inclination angle belongs to 30° and 60°-75°. The failure modes can be categorized into three types: axial damage, combined damage, and interface damage. The creep damage strength of most specimens is lower than the uniaxial compressive strength,which indicates that the specimen is damaged caused by long-term loading. The instantaneous strain decreased and then increased with the increase of interface inclination angle. Compared with an interface inclination angle of 0°,the interface inclination angle of 45°,60°,75°, and 90° of specimens instantaneous strain reduced by 22.68%,47.72%,52.01%,4.56%,respectively. The creep ratio shows a decline-stability-rise three-stage behavior with increased stress levels. The critical stress at creep failure decreases with the increase of the interface inclination angle,and the creep stability stage is gradually shortened. With the increase of the interface inclination angle,the stability of specimens gradually decreases. The Burgers creep model parameters were calculated from experiment, and the obtained theoretical curve was in a good agreement with the test data of instantaneous deformation and decay creep stages. The research findings can provide a reference for understanding the creep failure mechanism induced by the interface angle between concrete support and surrounding rock structures and for the safety of underground structural support.