Abstract: The composite rock mass with bedding angle has obvious dip angle effect，and its mechanical properties will change with the change of bedding angle.In order to explore the influence of bedding angle on the mechanical properties of composite rock mass failure and instability，the RA value，stress-strain curve，peak strength and elastic modulus of rock samples with different bedding angles under uniaxial compression were obtained by theoretical analysis and laboratory test.The results show that the combined rock mass with different bedding angles mainly undergoes shear failure at the initial stage of loading，and then ex⁃ tends to tensile failure at the later stage of loading.The specimen with an inclination angle of 15° mainly undergoes shear tensile composite failure，and the specimen with an inclination angle of 25° mainly undergoes shear slip failure. The peak strength and elastic modulus decrease with the increase of the bedding angle.

Key words: bedding angle, composite rock mass, uniaxial compression, mechanical properties