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Sunnyside Gold Corp. Page 11 March 10, 1993 <br /> Table 2. Sunnyside Mine concrete strength controlled bulkhead <br /> design lengths <br /> INPUT: Assumptions: low pressure grouted, 41 psi hydraulic pressure <br /> gradient, 3000 psi concrete, concrete/rock contact shear strength <br /> (based on lower 110 psi concrete shear strength and ACI 318-89, Sec <br /> 11.8.6) , 329 psi maximum concrete deep-beam shear stress at <br /> critical section (ACI 318-89, Sec 11.8.7) , 164 psi plain concrete <br /> tensile strength (ACI 318-89, Sec 18.4. 1) <br /> Bulkhead Tunnel Design Pressure Concrete Plain Length <br /> Tunnel Design Head Gradient Shear Concrete Reco- <br /> Ident. Height feet Length Strength Bending mmend- <br /> Width (psi) feet Length Length ed <br /> feet feet feet feet <br /> American 13 1550 16. 3 19.9 33 .4 25 <br /> Tunnel (670) <br /> F-Level 11 650 6. 9 7. 1 18. 3 8 <br /> Terry (280) <br /> Tunnel <br /> F-Level 10 630 6.7 6.2 16. 4 8 <br /> Brenneman/ (270) <br /> Sunnyside Connection <br /> B-Level 9 70 0.7 0. 6 4 . 9 3 <br /> Brenneman/ (30) <br /> Sunnyside Connection <br />