Geomechanics and Ground Control · Geomechanics · 1 mark · Numerical answer
Unadjusted roof RMR is64. The joint orientation and tunnel driving direction are shown. For joint dip20°–45°, apply adjustment−2 when driving with dip or−10 against dip. Find adjusted RMR as an integer.
The drawing shows excavation against the joint dip. Use the supplied against-dip adjustment of−10, rather than−2. Adjusted RMR=64−10=54. The40° apparent orientation in the drawing must be interpreted together with the direction arrow.
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