Based on precise measurements of topography on artificial irregular rock joint by employing a laser scanning instrument
at first
the joint surface was visualized by using GIS technique. Then the distributions of the geometrical properties such as roughness
aperture and asperity height were analyzed according to the histogram and the characteristic number of frequency distribution. The results showed that the asperity height and the aperture of the rough surface in granite joint and sandstone joint approximate match the normal distribution; while the roughness slope of the rock joints approximate matches Γ- distribution. For different kinds of rock joints
the distribution of the geometrical properties is respectively similar to each other.