Q$1.$ The following parameter values have been determined for three rock mass types found

along the route of a major new highway tunnel that passes at a high level through the flank

of a mountain range:

The fractures within each rock mass type have the properties

shown in the following table:

Write down a description for each of these three rock mass types, and describe their likely

engineering behaviour. Then apply the RMR system to these rock mass types, and compare

the assessment of their engineering behaviour made in this way with the description you

wrote down earlier. What do you conclude from this exercise about the ability of RMR to

discriminate between the engineering behaviour of these particular rock mass types?