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selected based on the Hoek Brown recommended values for Gneiss. Figure 1 <br /> illustrates the minor and major principal stresses in relation to each other. Figure 2 <br /> presents the normal stress versus the shear stress. <br /> An*19s of Rock Strength using Rodab <br /> Hoek 9ro-n Ctassrkaboe <br /> mtacc urmaaal comp.strength;sigal=39.7 ksi <br /> G$;=13 m,=23 Disturbance actor(E"=1 <br /> mace n+oduous iEii=300 ksi <br /> Hoek Orount Critenon <br /> rate=G.046015 s=5.04E-07 a=0.569t346 <br /> Moir-couko"Ft <br /> cohesion=0-29S437 kh fiction angle=6.74S3S deg <br /> Rock Mas Parameters <br /> tenu4 strength=-0.00044 ksi <br /> unums l compressive strength=0.01024 ksi <br /> gwhai strength=0.66078 ksr <br /> deformation mrodutsrs=6.53297 km <br /> 14 Principal Stresses <br /> 12 <br /> N <br /> Y <br /> N 10 <br /> a, <br /> M <br /> N 8 <br /> A <br /> a <br /> c 6 <br /> a <br /> 4 <br /> A <br /> 2 <br /> -2 0 2 4 6 8 10 12 <br /> Minor principal stress(ksi) <br /> Figure 1. Major vs. minor principal stresses <br /> Aggregate Industries Morrison Quarry GEI Consultants, Inc. <br /> South Quarry Highwall Design Technical Revision 16 August 2017 <br />