TABLE B5: POST-EARTHQUAKE STRENGTH SET Material (kN/ m3) Strength Parameters Porewater Pressure Operational Closure Zone A/I Fill – Sourced from mine overburden or foundation rock undercut 20.5 Sumin = 120kPa Su/sigmav’ = 0.32 ru = 0.1 Phreatic^ Zone A/I Fill – Sourced from foundation undercut ash and alluvium 17.5 Sumin = 50 kPa Su/σv’ = 0.28 ru = 0.3 Phreatic^ Zone F Fill 20.5 Duncan Gravel/Cobbles with Cu>4 16%ile ru = 0.05 Phreatic^ Zone G Fill 20.5 Su=100kPa - - Stockpile (to Zone D2 Rockfill) 19.5 Duncan Gravel/Cobbles with Cu>4 16%ile ru = 0.05 Phreatic^ Stockpile (to Zone D3) 19.0 c = 8 kPa = 15 deg ru = 0.4 Phreatic^ Stockpile (to Zone E) 19.0 Su/σv’ = 0.06 ru = 0.6 Phreatic^ Ignimbrite Rockfill 20.5 Duncan Gravel/Cobbles with Cu>4 16%ile ru = 0.05 Phreatic^ Ash/Surface CW Rhyolite/Dacite/Ign. SPTN <8 17.0 Su/σv’ = 0.23 ru = 0.3 Phreatic^ EW to VW Rhyolite & EW Ign. And Dacite Rock 17.5 Hoek – EW/VW Rhyolite & EW Dacite/ Ign. Phreatic^ plus ru = 0.1 Phreatic^ W Rhyolite Rock 18.5 Hoek – W Rhy. Dac. Phreatic^ Phreatic^ VW Ignimbrite Rock 19 Hoek – VW Ign. Phreatic^ Phreatic^ VW Dacite Rock 18 Hoek – VW Dacite. Phreatic^ Phreatic^ W Dacite 25 Hoek – W Rhy. Dac. Phreatic^ Phreatic^ Epiclastic Mat. 17.0 c’=5kPa ’=35 deg Phreatic^ Phreatic^ Paleo Boulder Alluvium 17.0 c’=5kPa ’=35 deg Phreatic^ Phreatic^ Stability analyses are summarised in the tables below. Section 1 runs from the southeast corner to the northwest. It includes the west slope of the NRS. The foundations include rhyolite over dacite and ignimbrite materials. Section 2 runs from the south to the north and includes the north slope of the NRS. The foundations include fill placed for the Workshop Ramp (haul road) at the south end, with rhyolite overlying weathered dacite materials. On Section 2 there is some minor ignimbrite materials at the surface, which are stronger than the weathered dacite surface and therefore a weathered dacite profile has been preferentially applied in the analyses. Geotechnical stability is dependent on the management of materials of different strengths within the NRS. Weaker material strengths were applied in the analyses in the centre of the stockpile with stronger material applied at the outer extents.
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