Roughness is one of the important factors that affect the strength and deformation characteristics of jointed rock mass. In this paper

3D printer has been employed to making molds firstly

and casting the different roughness joint rock specimens(joint roughness coefficient JRC = 2

7

12

17 and 22). Triaxial compression tests are carried out on rock specimens with different roughness joints by using GCTS triaxial rock testing system of high temperature

high pressure and dynamic-static coupling loading to obtain the triaxial stress-strain curves. Then

based on the curves

we analyze the influence of JRC on the triaxial compressive strength and deformation characteristics of rock. At the same time

acoustic emission test system has been adopted to reveal the acoustic emission characteristic of the different roughness jointed rock specimens in the process of triaxial compression tests. Finally

the morphology of the joint surface is observed by digital three-dimensional video microscopy system

and the relationship between the peak strength of jointed rock specimens and JRC under different confining pressures has been discussed. The results show that the presence of joint results in a significant reduction in the strength of the joint rock specimen; JRC also has great influence on the morphology

quantity and spatial distribution characteristics of failure crack of rock. With the increase of the JRC value

the shear strength of rock joint increase

the triaxial compressive strength also increase

the rock specimen will changed from brittle failure to ductile failure.