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170_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

# 170_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - 2.5...

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2. Empirical Me/hod (based on model and field les/s): for sb3B for 3B < S < 8B for s ~ 88 DF47 ~ = 0.70 interpolate n = 1.0 D 7/B, 3. Block Me/hod (Terzaghi & Peck, 1948) Entire pile group fails as a block, soil inside of ouler perimeter moves with piles I P"" = 2 D (B, + 19) c, + c, NolB, 19) and P" = P"" 13 I /r-----,,-.- where D = depth of pile penetration B, = width of pile group L, = length of pile group C u = soil cohesion N c = bearing capacity factor = 5(1+.E-)(1+~)\$9 (Skempton, 1951) 5B, 5L, L, 4. Example: friction piles in cohesive soil check alllhree methods - for design choose lowest value of P" q,= 4000 psf c, = q.,l2 = 2000 psf = 2.0 ksf l' dia. .-/ Ym = 126 pet, y,,,,, = 150 pcl siB = 2.5 A, = ( n(: )') = 0.785 ft' 2.5' W = (0.785 ft')(35')(150 pet) = 4,123 Ibs = 4.1 k 2.5' 0.~ 35' 2.5' + l' = 3.5' Method 1
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Unformatted text preview: 2.5' 0.~ 35' 2.5' + l' = 3.5' Method 1 P, = RBDa c, + A, c, N, -W (single pile) = n(1 ')(35')(0.50)(2.0 ksf) + (0.785)(2.0 ksf)(9) -4.1 k = I'J-D k J:. . ) [ (,-II (L)' po,) L 1-P,=(P,/2)= &OK and ~= \-~r"·.n (,.5' 90(.)(')-0.1. P,,= D.", (!ok) ('I p,J,,)~ 1~2k Method2 P,,=O.lO(bOkH'1 pd.,), Ibl!k Method 3 siB = 2.5, 8, = L, = 2.5 + , = 3.5' ( 35')( 35') N, = 5 1 + 1 + . =' IS> 9 I ;. use q 5(3.5') 5(3.5') 3.5' P,,= 2 D (B, + L,) c, + c, N, (B, 19) = 2(35')(3.5'+3.5')(2.0 ksf) + (2.0 ksf)(9)(3.5')(3.5') r P o ,= ,\,0' ~'l.o.' = 1,200 k and P,g = 1,;). .00 I~, =",:100 k s . l.l.'"l r "l (hi ( .. fl,," •...
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