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Table 5-1. Summary of Recommended Hoek-Brown Material Inputs for Granitic and Biotitic Gneiss <br /> - - — Value <br /> Parameter Description Selected Basis <br /> UCS (Qci) Uniaxial compressive strength of 12.5 ksi Avg. value of 7 UCS tests <br /> intact specimen from lab testing performed in 2018 <br /> Geologic Quantified value of rock mass Based on blocky, disturbed <br /> Strength Index based on visual assessment of 40 rock mass with Fair to Good <br /> (GSI) structure and the condition of discontinuity surfaces <br /> discontinuities <br /> Material Recommended value from <br /> Constant(mi) Based on rock type 28 Roc Lab for gneiss bedrock <br /> (28 ± 5) <br /> Disturbance Accounts for disturbance due to 0 (Global) Production blasting used for <br /> Factor(D) blasting 1 (Local) highwall excavations <br /> Modulus Ratio Recommended value from <br /> (MR) Based on rock type 500 RocLab for gneiss bedrock <br /> (500 ± 225) <br /> Bench and Multibench Failure Envelope Global Failure Envelope <br /> 4fXOK..Max Multl-lunch P.-al.Omit - _ - <br /> Orm h Hri�tn ;250r1} / f . <br /> // .t��• e /Jn> IJiry l✓r+h 1:1lI <br /> J — ' <br /> 1„ „ <br /> Figure 5-1. Hoek-Brown Failure Criterion for local stability (left) and global stability (right) for granitic <br /> and biotitic gneiss. <br /> 19 <br /> Aggregate Industries—Morrison Quarry GEI Consultants, Inc. <br /> AM-07 Geotechnical Stability Exhibit November 2020 <br />