List and describe the 3 different ways that piles resist loading. Use sketches
to illustrate your answers.
Consider a concrete pile that is 0.305 m x 0.305 m in cross section driven
in sand. The pile is 15 m long. Shown below is the variations of Standard
Penetration Test values with depth and the Soil Profile. Estimate the
ultimate bearing capacity using Meyerhof (1976) method. State any
assumptions you make.
kPa or 400N kPa whichever is the lesser
fs & NkPa
(c) A 500 mm diameter bored concrete pile is to be formed in the soil profile
shown below. Determine the ultimate bearing capacity of the pile for
embedded length of 11 m?
Granular fill (0-3 m)
y= 20 kN/m³, $ = 30°, K3 = 1.0
Dense gravel (3-7 m)
y= 21 kN/m³, $ = 35°, Ks = 2.0
Glacial clay (7-11 m)
y = 20 kN/m³, Co at 7 m = 120 kPa, Ca at 11 m = 220 kPa, a = 0.6, Nc = 9.0
The following formulas should be used.
a = As.Ks:/z.tan(0.754')
a = axCuxAs
a = coxNoxAb
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