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B- Level/Brenneman Bull d Design <br />p = ratio of nonprestressed tensile reinforcement to concrete area — b <br />yw = water density (62.4PCF) <br />y = concrete density (151PCF) <br />Q = flexure stress (psi) <br />9S = strength reduction factors <br />0.90 flexure rebar tension <br />0.85 concrete shear <br />0.65 plain concrete flexure <br />Load factors (ACI 318R -92, Sec 9.2.2, 9.2.3, 9.2.5) <br />Static fluid load factor (F) = 1.4 <br />Hydraulic pressure gradient: <br />Low pressure grouting of concrete -rock contact but not rock, gradient allowable = 41 psi/ft <br />(Garrett & Campbell -Pitt, 1958, Chekan, 1985, p11), with factor of safety of 4 <br />B- Level/Brenneman Bulkheads, maximum pressure head <br />p Hyw <br />— 70(62.4) — 30 psi <br />144 144 <br />Required bulkhead length L = P = 30 = 0.73 ft <br />41 41 <br />Pressure gradient with L = 3 ft <br />Concrete shear on B- Level/Brenneman Bulkhead perimeter: <br />f'3 = 211 = 2 2500 = 100 psi (ACI 318R -92, Sec 11.3.1.1) <br />L _ Ophe _ (1.4)30(9)9 — 0.95 ft <br />[2(h + a's] [2(9 + 9)100 <br />W = Ophe = (1.4)30(9)9(144) = 490000 lb <br />W _ 490000 <br />v° __ [ — 2(h + e)]L(144) �2(9 + 9)3(144) 31.5 psi <br />FS = 100 — 3.17 <br />31.5 <br />Page 2 February 21, 1994 <br />p = 30 = 10 psi <br />pg L 3 ft <br />