ABSTRACT
The primary difference between structures in soil and those in rock is that rock masses contain discontinuities. The analysis and design of any structure in rock require information on discontinuities in one form or another (Goodman, 1976; Hoek & Bray, 1981; Brady & Brown, 1985; Wyllie, 1999). Blocks formed by sets of unfavorably orientated discontinuities may fail by sliding or toppling, causing excessive movement or failure of foundations.
