rameters relating to the geometry and mechanical condition of the rock
mass are used. In the case of the RMR system, these are:
(a) the uniaxiai compressive strength of the intact rock;
(b) RQD;
(c) discontinuity spacing;
(d) condition of discontinuity surfaces;
(e) groundwater conditions; and
(f) orientation of discontinuities relative to the engineered structure.