ABSTRACT
Probably, the most important parameter influencing overall strength and stability of surrounding rock mass in both surface and underground excavations opened in jointed rock mass is the shear behaviour of discontinuities. Therefore, parameters that affect the shear behaviour of discontinuities should be carefully studied for better understanding of the phenomenon of rock supporting. Roughness of discontinuities is closely related with the strength characteristics of joints and discontinuities.
Various means of discontinuity surface roughness determination methods developed for the isolation of the effects of discontinuity surface roughness on shear strength, dilation and friction properties of surfaces. The close-range photogrametry that was used for the digitally three dimensional modelling of discontinuity surfaces. Digital stereo pictures and subsequent numerical surface determination analysis were used successfully for comprehensive modelling of discontinuity roughness.
