(b) A single test pile, 300 mm diameter, is driven through a depth of 8 m of clay which has an undrained cohesive strength varying from 10 kPa at its surface to 50 kPa at a depth of 8 m. Estimate the safe load capacity of the pile, for an overall factor of safety 3.0. Assume a = 0.65 and N. 9.0. (Answer 60 kN).
(b) A single test pile, 300 mm diameter, is driven through a depth of 8 m of clay which has an undrained cohesive strength varying from 10 kPa at its surface to 50 kPa at a depth of 8 m. Estimate the safe load capacity of the pile, for an overall factor of safety 3.0. Assume a = 0.65 and N. 9.0. (Answer 60 kN).
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:QUESTION 1
(a) Determine the allowable load-carrying capacity of the bored concrete
pile for: embedded length = 8 m, and embedded length = 11 m. Take the
diameter of the pile as 0.5m. (Answer Qal = 357 kN @8m and 573 kN
@11m for FS = 3).
Q.
Qal
FS
%3D
The factor of safety generally used ranges from 2.5 to 4, depending on
the uncertainties surrounding the calculation of ultimate load.
Depth
(m)
y = 20 kN/m3
Q' = 30°
Ks = 1.0
Loose granular fill
Y = 21 kN/m3
p' = 35°
Ks = 2.0
Dense gravel
7
y = 20 kN/m3
cu at 7.0 m = 120 kPa
cu at 8.0 m = 145 kPa
8
Glacial clay
! cu at 11.0 m = 220 kPa, adhesion factor, a
= 0.6, Nc = 9
11
(b) A single test pile, 300 mm diameter, is driven through a depth of 8 m
of clay which has an undrained cohesive strength varying from 10 kPa at
its surface to 50 kPa at a depth of 8 m. Estimate the safe load capacity of
the pile, for an overall factor of safety = 3.0. Assume a 0.65 and N, = 9.0.
(Answer 60 kN).
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