Bieniawski (1974) developed an engineering classification criterionfor jointed rock masses based on the following parameters; a.strength of intact rock material. b.drill core quality RQD . c.spacing of the discontinuities. d.orientation of thediscontinuities, e. condition of the discontinuities, and f. groundwater inflow per 10mm tunnel length per minute.
Giving the classes, explain how rocks are put intofive (5) classes by each of the above parameters. Alsogive the parameter rating in each of the fiveclasses. Hint; use a table to answer this question