S.A.Sadrnejed - Associate Prof. in Civil Eng.Dept , K.N.Toosi University of Technology.Tehran

An important concern in rock mechanics is non-homogeneity as joints or fault. This noticeable feature of failures in rock is appearance of slip surfaces or shear bands, the characteristics of which are associated with deformation being concentrated in a narrow zones and the surrounding amterial remaining intact. the methodology to be discussed here is modeling of slip on the local and global levels due to the deformation procedure of the hoint rock.Upon the presented methodology, more attention has been given to dlip initiation and propagation through joint rock.