Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.16P
To determine
Find the ultimate load carrying capacity of the pile.
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12.16 Consider a continuous flight auger pile in a sandy soil de-
posit 10 m long with a diameter of 0.45 m. Following is the
variation of standard penetration resistance values (N60) with
depth.
Depth (m)
1.5
3.0
4.5
6.0
7.5
9.0
10.5
12.0
13.5
15.0
17.0
18.5
20.0
N60
6
7
5
8
10
10
13
15
18
20
17
18
21
Estimate the ultimate load-carrying capacity of the pile.
Assume unit weight of soil, y = 15.5 kN/m³.
A pile of diameter 0.4 m is fully embedded in a clay stratum having 5 layers, each 5 m thick as
shown in the figure below. Assume a constant unit weight of soil as 18 kN/m³ for all the layers.
Using method (= 0.15 for 25 m embedment length) and neglecting the end bearing
component, the ultimate pile capacity (in kN) is
G
Y=18kN/m³-
for all layers
7XXX
5m
5m
5m
5m
5m
= 25 m
0.4m,
c=40 kPa
c=50 kPa
c=60 kPa
c=70 kPa
c=80 kPa
S
XXXX
7. If a 45 cm diameter pipe pile is driven into clayey soil to a depth of 12 m. (a) what would
the allowable load capacity (Q) be? The water table is 2 m below the ground surface and
the soil profile consists of two clay layers (refer to the figure below). Use the ß method to
calculate skin friction and the R=30° for all clay layers. (b) Explain how you selected
FS value you use.
12 m
▶
9m
2m
45 cm
Y = 18.5kN/m³
= 30kN/m²
Ysat = 19kN/m³
C₂ = 30kN/m²
Ysat = 20kN/m²
S = 60kN/m²
Chapter 12 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 12 - Prob. 12.1PCh. 12 - A 20 m long concrete pile is shown in Figure...Ch. 12 - A 500 mm diameter are 20 m long concrete pile is...Ch. 12 - Redo Problem 12.3 using Coyle and Castellos...Ch. 12 - A 400 mm 400 mm square precast concrete pile of...Ch. 12 - Determine the maximum load that can be allowed on...Ch. 12 - A driven closed-ended pile, circular in cross...Ch. 12 - Consider a 500 mm diameter pile having a length of...Ch. 12 - Determine the maximum load that can be allowed on...Ch. 12 - Prob. 12.10P
Ch. 12 - Prob. 12.11PCh. 12 - Prob. 12.12PCh. 12 - A concrete pile 16 in. 16 in. in cross section is...Ch. 12 - Prob. 12.14PCh. 12 - Solve Problem 12.13 using Eqs. (12.59) and...Ch. 12 - Prob. 12.16PCh. 12 - Prob. 12.17PCh. 12 - A steel pile (H-section; HP 310 125; see Table...Ch. 12 - Prob. 12.19PCh. 12 - A 600 mm diameter and 25 m long driven concrete...Ch. 12 - Redo Problem 12.20 using Vesics method, assuming...Ch. 12 - Prob. 12.22PCh. 12 - Prob. 12.23PCh. 12 - Solve Problem 12.23 using the method of Broms....Ch. 12 - Prob. 12.25PCh. 12 - Solve Problem 12.25 using the modified EN formula....Ch. 12 - Solve Problem 12.25 using the modified Danish...Ch. 12 - Prob. 12.28PCh. 12 - Prob. 12.29PCh. 12 - Figure 12.49a shows a pile. Let L = 15 m, D (pile...Ch. 12 - Redo Problem 12.30 assuming that the water table...Ch. 12 - Refer to Figure 12.49b. Let L = 18 m, fill = 17...Ch. 12 - Estimate the group efficiency of a 4 6 pile...Ch. 12 - The plan of a group pile is shown in Figure...Ch. 12 - Prob. 12.35PCh. 12 - Figure P12.36 shows a 3 5 pile group consisting...Ch. 12 - Prob. 12.37P
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