123_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

123_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - sum...

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DF10 Layered Soils: o Layer Interaction: shear strength and end bearing are mobilized in each layer in proportion to pile movement (stress YS. strain). detailed analysis of pile capacity requires development of load vs. displacement curves for each layer (both side shear and end bearing) and a finite difference approach. See program developed at UF - "PL-AID". can obtain approximate solution using the methods already discussed. o Side shear: calculate the side shear in each layer independently use the design method appropriate to each soil type, multiply average f,; in each layer by pile side area in that layer for sands, the critical depth limitation applies from the surface of each layer (D, measured from top of each layer not the soil surface)
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Unformatted text preview: sum the layer contributions n n Q s = IQ sI = IfslA s ! i=1 i=1 o End Bearing: use the design method appropriate for the bearing layer weak layers within BB above toe and 35B below toe will affect bearing capacity for sands the critical depth limitation applies starting at top of bearing layer (D, measured from top of bearing layer not the soil surface) o Drained V5. Undrained: do not mix drainage behavior in same analysis, all layers are drained or all layers are undrained (use effective stress analysis for sands in either case) use drained analyses for unsaturated soils a Example Side Shear Profiles: I Q 1 (for Clay at toe)...
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