121_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

121_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 -...

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DF13 Soli Type Description 1 Plastic clay 2 ClaY-silt-sand mixtures, very silty sand, slits and marls 3 Clean sands 4 Soft limestone, very shelly sand 5 Void (No Capacity) o ultimate side shear fully mobilized at == 0.1" 0.3" movement o ultimate bearing requires much more movement, o popular Davisson failure criteria based on movement o pile capacity based on SPT found to correlate with Davisson failure at: (ultimate side shear + "mobilized" end bearing) = ultimate pile capacity where "mobilized end bearing" == 1/3 of ultimate end bearing o unit end bearing at pile tip (and any other depth) = average of 8.08 above and 3.58 below pile tip: q T= (qsB + q3.5B )/2 where qr = average, uncorrected unit end bearing at pile tip Ciae = average of unit end bearing over 88 above
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Unformatted text preview: pile tip (terminate end bearing average above tip at less than 8.08 if stronger bearing layer or ground surface is encountered) <b.5B = average of unit end bearing over 3.58 below pile tip o if the bearing layer is stronger than the layer above it, then end bearing is corrected for the depth embedment in the bearing layer, DA, if less than a critical depth, Dc: Soli Type Description Critical Depth Ratio (Dc/B) 1 Plastic clay 2 2 ClaY-Silt-sand mixtures, very silty 4 sand, slits and marls 3 Clean sands (N S 12) 6 (12 < N S 30) 9 (N > 30) 12 4 Soft limestone, very shelly sands NA...
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