It is important to research the mechanical behavior of the rock/rock and rock/concrete joints for the assessment of stability issues involving rock masses and engineering foundations. A finite element model of 3D rough surface unchanged in its width is established by employing ANSYS to simulate the direct shear test conducted by Bandis et al; then compared with the test results

some moderate well numerical results are acquired

which testified that it is feasible to apply ANSYS program to analyze the bi-body shear performance. In addition

several regular sawtooth interface computational models are used to examine the shear strength theoretical formula of Patton

consequently; it is proved again that using ANSYS to model the shear behavior is applicable. Furthermore

the evaluation of this paper focuses on the analysis of the shear stress-displacement curve

shear distribution on contact plane and dilatancy effect as well as cohesion effect.