The jointed rock mass is a discontinuous body with special structure

and shows the anisotropic mechanical characteristic. In order to understand its complex mechanical characteristic

the mechanical effects of single joint surface is analyzed theoretically; and the triaxial compression test is conducted on samples with single prefabricated joint. The test results show that the mechanical characteristic of jointed samples is governed by either joint surface or rock. Compared with the intact samples

the mechanical parameters of jointed samples reduce inordinately. The Young’s modulus

compressive strength

cohesion are in U-shaped along with joint inclination and the minimum value occured at the inclination of 60° jointed samples. On the contrary

the internal friction angle increases linearly with the joint inclination. With the increasing of confining pressure

the ratio of maximum to minimum of Young’s modulus and compressive strength decrease; it shows that differences of mechanical characteristic of various inclination jointed samples lessen.