Rock mass classification systems are commonly employed during exploration for rock tunnels. Joint orientation is an important input, affecting blasting, span widths, roof support and groundwater flow. When using Bienawski's geomechanics classification system, the favourability of joint orientations with respect to tunnel drive direction must be selected. As joint populations are generally plotted stereographically, an overlay has been prepared on which sectors defining favourability in terms of the geomechanics classification are delineated. Superimposition of the favourability overlay on a joint pole counter plot allows easy assessment of the effects of joint set orientations.

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