117_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

117_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - DF7...

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Unformatted text preview: DF7 Example 1 - Driven Pile in Cohesion less Soil (Sand): Determine the allowable (design) load for the square, concrete pile shown at left. Soil properties: $ = 38, very dense sand, some silt = 130 pcf, Ym = 128 pel D =25' y,,, Assume FS = 3, GWT 5' ( = 5B) below tip of pile 1. Determine critical depth: dense sand, use 20 pile diameters = 20 (1 ') = 20' 2. Assume K = 1.75 (reduce because sand is silty) 3. Determine pile/soil friction: concrete pile so tano = 0.45 4. Draw effective vertical stress and unit side shear distributions along pile: (note stress is constant below Dol cr'", = a f5 = K cr'v tan 0 = 0 D = 25' ?O ('21) ____ L ..- (.1 S(;lstO) (O,I,f) 201' pr.{ )<(,0". :. 5. Q, = (J f, dA,) = l: T,t Pi liZ, = (l: f;; liz,) p _ [20' (0 + 2016PSf) + 5' (2016 PSf)](4X1' J( 1k ) = 121.0 kips 2 1000lb 6. Q, = (q, A,) q, Nq = q, B' = q Nq + 0.4 B Y N, = 83 from = plot (use mid range) Ny = 78.6 from Terzaghi BC factors q = cr', = 2560 psi at toe PC( q, '500". ) I.. In)' O.~(I'J ("Ypt?)(1K.L) = Qt 1r':l.., Ilia' If,v;J'( ;: 2/Glso~1 = l').lL,fO"p'C 'I)' (I .... ~ ~-".",.. Ii,~'Lrl(,:f5 /1000")-::.. "",,,'j ...
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This note was uploaded on 02/10/2012 for the course CEG 4012 taught by Professor Staff during the Fall '08 term at University of Florida.

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