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Gold Prince Tunnel Bulkhead Calcs Page 2 August 18, 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, p11), with factor of safety of 4 <br /> Gold Prince Tunnel bulkhead, for 20 ft pressure head to push water into Sunnyside Mine <br /> p= HYA _ 20(62.4) =9 psi <br /> 144 — 144 <br /> Required bulkhead length L= 4= at =0.2 ft <br /> Pressure gradient with L= 5 ft s= 5 = 1.8 psi/ft <br /> Gold Prince Tunnel bulkhead, for 65 ft pressure head to push water to ground surface <br /> p= It. _ 65(62.4) = 28.2 2 psi <br /> 144 144 <br /> Required bulkhead length L= P = 2 8.2 = 0.7 ft <br /> 41 41 <br /> Pressure gradient with L= 5 ft 5= 2 5.2 = 5.6 psi/ft <br /> Concrete shear on Prince Mne Tunnel perimeter: <br /> d =2 fv =2 3 000 = 110 psi (ACI 318-89, Sec 11.3.1.1) <br /> Gold Prince Tunnel bulkhead, for 20 ft pressure head to push water into Sunnyside Nfine <br /> phl _ 9(9.5)8.5 _ 727 =0.2 ft <br /> L [2(h+1)f;] [2(9.5+8.5)110] — 3960 <br /> IW=phl =9(9.5)8.5 144 = 105,000 lb <br /> = w 105000 =4.1 psi <br /> [2(h+l)]L(144) = [2(9.5+8.5)]5(144) <br /> FS = �� = 410 =26.8 <br /> 2 <br />