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Table 5-1. Summary of Recommended Hoek-Brown Material Inputs for Granitic and Biotitic Gneiss <br /> Parameter Description Selected Basis <br /> Value <br /> UCS (ac;) 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 (m;) 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 Multiben€h Failure Errs Jl p.-, MAW Failure Envelope <br /> L5 <br /> i dppm.Mid Multi-bench P.al.Lbnit <br /> pyi4l,rleir�1 i2SOr1} ,,,, M, r <br /> ,ac � <br /> ti <br /> � n <br /> ais <br /> �I 1 <br /> ui <br /> J.5 <br /> wc� <br /> U n <br /> i i N�rmS strez r6s1} <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 />