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SubTerra, Inc. Floor Strength Evaluation -EMPIRE MINE 3/28/95 <br /> <br /> <br /> <br />Floor Stability using Vesic's Strength Equation: <br />P~oad = 1.1 " h ' A~/Ai <br />Where, <br />h =Depth (ft) <br />AP =Area of Pillar <br />At =Total area supported by pillar <br />Qb = SS' Nc <br />where, <br />Qb =Bearing capacity (psi) <br />SS =Shear strength (psi) <br />Nc = 5.61 + (0.146 (Wp / tnoor)) <br />tnoor =immediate floor thickness (ft) <br />Wp =pillar width (ft) <br />FS = Qb / P~oad <br /> <br /> <br />h (ft) 1000 Wentry 20 Eratio (%) 36 <br />Ap 6500 Wp 65 (floor 4 <br />At 10200 Hp 10 SS 570 <br />UCS 4920 Lp 100 TS 180 <br /> <br />Ptoad = 1726 <br />Qb = 4550 <br />FS = 2.64 <br /> <br /> <br />Notes: <br />1. The shear strength was estimated using uniaxial compressive and splitting tensile <br />strength results. <br /> <br /> <br />