B3. STABILITY ASSESSMENT The following strength parameter sets have been selected for NRS stability. TABLE B1: HOEK ROCK MASS STRENGTH RELATIONSHIP PARAMETERS Rock Strength Structure Surface Condition c (MPa) mi mb/ mi s a EW/VW Rhy. & EW Dacite/ Ign. EW/VW crushed V.poor 1 16 .04 0 .6 Rhyolite W blocky/ seamy Fair 5 16 .12 .001 .5 VW Ignimbrite VW v.blocky Fair 1.5 15 .16 .003 .5 VW Dacite VW crushed Poor 2 17 .06 0 .55 W Rhy. Dac. W blocky/ seamy Fair 5 16 .12 .001 .5 c – uniaxial compressive strength TABLE B2: DUNCAN FILL STRENGTH RELATIONSHIP PARAMETERS Fill Relative Density Dr A B C D Std dev. Percentile Duncan Gravel/Cobbles with Cu>4 16%ile 0.85 44 10 7 2 3.1 16%
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