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Gold Prince Portal Bulkhead Calcs Page 2 August 19, 1996 <br /> Load factors(ACI 318, Sec 9.2.2, 9.2.3, 9.2.5) <br /> Static fluid load factor(F)= 1.4; <br /> Factor for fluid load under earthquake acceleration(F)= 1.05; <br /> Earthquake accelerated load factor(E)= 1.40 <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, pl 1), with factor of safety of 4 <br /> Gold Prince Tunnel portal bulkhead, for 14 ft maximum pressure head in 10 ft wide by <br /> 10.5 ft high tunnel cross section <br /> HyW 14(62.4) =6.1 psi <br /> p— 144 — 144 <br /> Required bulkhead length L= 4= 4i =0.15 ft <br /> Pressure gradient with L=2.5 ft 2.5 = 55 =2.4 psi/ft <br /> Concrete shear on Prince Mine Tunnel perimeter: <br /> fs =2 ff =2 3000 = 110 psi (ACI 318-89, Sec 11.3.1.1) <br /> __ phi _ 6.1(10.5)10 641 <br /> L [2(h+l)f;] — [2(10.5+10)110] — 4510 —0.14 ft <br /> W=phl =6.1(10.5)10(144)=92,200 lb <br /> V = w _ 92200 =6.2 psi <br /> [2(h+l)]L(144) — [2(10.5+10)12.5(144) <br /> FS = vs = -2 = 17.7 <br /> Plain concrete deep-beam bending stress design, Gold Prince Tunnel (ACI 318-89, Sec 9.9.2.5, <br /> 18.4.1(b), & ACI 318-71, Sec 9.2.1.5) <br /> cD =U= 1.4p(144) = 1.4(6.1)144 = 1,230 CnJ <br /> M._ m12 1230(102) = 15,400 ft-lb <br /> — 8= a <br /> M° 1s400 =23,700 ft.lb <br /> 0.65 0.65 <br /> 2 <br />