Question

Problem 3 A prefabricated concrete pile is to be driven into a dense sand deposit as shown in Figure 3 Determine the following; 1. Ultimate bearing capacity of the pile using Meyerhof and NORDLUND method. 2. Using Driven sofiware, calculate the capacity of the pile. (Attach report from the software). 3. At this same soil profile, compare the ultimate capacity of different piles (high displacement and low displacement) and comment based on your results. You should present the graphical output of your results for all the pile types. No report is required. Clay cu=50 kPa Y-17 kN/m !! Sand: ! | c':-0, ?-350 Diameter 0.5 m Figure: 3

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Answer 1

Assume D _ c = 10 d = 10 (0 . 5) = 5 m critical depth = 5 m Effective stress Assume N _ q = 18 Q _ u = Q _ b + Q _ s = A _ b f _ b + A _ s f _ s for sand f _ s = k sigma _ va Tan sigma Rightarrow k = 1 - sin phi/1 + sin phi = 1 - sin 35/1 + sin 35 = 0 . 271 Rightarrow a _ b = A _ b sigma'_ v N _ q Q _ b = (pi/4) (0 . 5) ^2 18 = 123 . 69 k N Q _ s = A _ s alpha C + A _ s k sigma ' _ v a tan sigma = (pi) (0 . 5) (5) (1) (50) + (pi) (0 . 5) (8) (28 . 27) Tan 35 degree = 392 . 7 + 248 . 75 = 641 . 44 k N Ultimate beaming capacity of pile = 641 . 44 + 123 . 69 = 765 . 09 k N