Abstract
It is well-known that shear strength of rock mass is strongly affected by shear strength of rock joint. In this study, direct shearing tests of artifitial joints, which had been presented with referring the actual joint surface roughness, have been carried out before and after grouting, in order to clarify grouting influence of rock joint properties on joint shear strength improvement by grouting. The test results shows that the cohesion of joint can be improved by grouting, but the friction angle can not be done in the case that the mating of joint planes is constant. The rolls of joint roughness, persistence, filling, aperture and wall strength are discussed based on the test results. It is clear that Joint roughness, persistence and filling play very important roll on the improvement of joint cohesion.
