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PROJECT: <br />Squaw Gulch VLF <br />FEATURE: <br />Riser Pipe Design <br />DETAILS: <br />Downdrag <br />• Analysis: <br />Select backfill = Screened ore <br />Assume: <br />JOB NO: <br />11256 <br />BY: <br />OV <br />CHKD BY: <br />DTW <br />Yd = 110 pcf (similar to ore) <br />= 35° <br />6, -2.65 <br />w„ = 10% (field capacity for ore is 5.6 %, so conservative) <br />Worst Case: Assume "wet" ore to full depth and no solution in P55A. <br />Y ,.-Yd * (1 +w) <br />= 110* (1 + 0.10) = 121 pcf <br />K.= 1 - sin4, = 1- sin(35 °) = 0.426 = 0.43 <br />Based on NAVFAC 7.2: <br />ch between gravel and steel 17° <br />Average lateral stress = 1/2 * (110 ft * 121 pcf) * 0.43 = 2,861.7 psf <br />Maximum lateral stress = (110 ft * 121 pcf) * 0.43 = 5,723.3 psf <br />110' <br />24 dia. <br />SHEAR TRACTION DUE <br />TO SETTLEMENT <br />LATERAL STRESS <br />DISTRIBUTION <br />SHEET, 3 OF 7 <br />DATE: <br />08/03/2010 <br />DATE: <br />08/03/2010 <br />