Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN: 9781305081550
Author: Braja M. Das
Publisher: Cengage Learning
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Chapter 9, Problem 9.28P
To determine
Find the allowable load-carrying capacity of the pile group.
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2.
Consider a group of 450 mm x 450 mm reinforced concrete piles were driven into
thick loose sand layer with the average unit weight and internal friction angle of 16 kN/m3
and 30°, respectively. Estimate the group pile capacity with the arrangement as shown in
Figure Q2 if the length of pile embedment is 30 m assuming ground water table is far
below the ground surface. Use 8 = 0.80 and K = 1.5Ko.
3B
3B
3B
1
3
3.5B
b
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9.
10
11
a
3.5B
2
4
1.5B
1.5B
1.5B
1.5B
1.5B
1.5B
Figure Q2
A group of piles as shown on the figure has a
cross section of 0.30 m x 0.30 m. It has a total
length of 15 m. The piles are embedded in a
homogeneous saturated clay with Cu = 70
kPa. Unit weight of clay is 18.8 kN/m³ and the
ground water table is located at a depth of
18 m. below the ground surface. Factor of
safety = 4. Compute the allowable load-
bearing capacity of the group of pile acting as
individual piles.
Qall
Clay
Cu70 kPa
70
15m
56 m-
LI-2.74 m
-Lz=3,96-
Ans. 2816.10 kN
Chapter 9 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 9 - A 20 m long concrete pile is shown in Figure...Ch. 9 - Refer to the pile shown in Figure P9.1. Estimate...Ch. 9 - Prob. 9.3PCh. 9 - A driven closed-ended pile, circular in cross...Ch. 9 - Prob. 9.5PCh. 9 - Prob. 9.6PCh. 9 - Prob. 9.7PCh. 9 - Prob. 9.8PCh. 9 - Prob. 9.9PCh. 9 - A concrete pile 16 in. 16 in. in cross section is...
Ch. 9 - Prob. 9.11PCh. 9 - Solve Problem 12.13 using Eqs. (12.59) and...Ch. 9 - Prob. 9.13PCh. 9 - Prob. 9.14PCh. 9 - A steel pile (H-section; HP 310 125; see Table...Ch. 9 - A concrete pile is 20 m long and has a cross...Ch. 9 - Prob. 9.17PCh. 9 - Prob. 9.18PCh. 9 - Solve Problem 12.23 using the method of Broms....Ch. 9 - Prob. 9.20PCh. 9 - Solve Problem 12.25 using the modified EN formula....Ch. 9 - Solve Problem 12.25 using the modified Danish...Ch. 9 - Figure 12.49a shows a pile. Let L = 15 m, D (pile...Ch. 9 - Redo Problem 12.30 assuming that the water table...Ch. 9 - Refer to Figure 12.49b. Let L = 18 m, fill = 17...Ch. 9 - A concrete pile measuring 16 in. × 16 in. in cross...Ch. 9 - The plan of a group pile is shown in Figure...Ch. 9 - Prob. 9.28PCh. 9 - The section of a 4 × 4 group pile in a layered...Ch. 9 - Prob. 9.30P
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- A concrete bored pile has a diameter of 800 mm as given in the figure below. Calculate the ultimate load carrying capacity of the pile. -0.8- Clay Cu = 60 kN/m² Y = 18 kN/m³ %3D 4m G.W.T Sand 6m $ = 30° Y = 20 kN/m³ Clay Cu = 100 kN/m² Y = 20 kN/m³ 5marrow_forward1. A 3 X 4 group pile that are square in cross section (356 mm x 356 mm) as shown in the figure. The center-to-center spacing, d, of the piles is 889 mm. If a ₁ = 0.68, a 2 = 0.51. Assume the piles act individually. Determine the ultimate load-bearing capacity of the pile group. G.W.T 4.57 m 13.72 m Clay "=50.3 kN/m² Y17.6 kN/m³ Clay C=85.1 kN/m² Y 19.02 kN/m T 889 mmarrow_forwardFigure 18.26a shows a pile. Let L = 20 m, D = 450 mm. Hf = 4m, f = 17.5 kN/m3, fill = 25. Determine the total downward drag force on the pile. Assume that the fill is located above the water table and that = 0.5 fill. FIG. 18.26 Negative skin frictionarrow_forward
- Figure P12.36 shows a 3 5 pile group consisting of 15 concrete piles of 400 mm diameter and 12 m in length. What would be the maximum load that can be allowed on the mat with a factor of safety of 3? The piles have a center-to-center spacing of 1200 mm.arrow_forward2. For the group of piles shown in Figure 2, determine the safe length of piles.arrow_forward9.27 The plan of a group pile is shown in Figure P9.27. Assume that the piles are embedded in a saturated homogeneous clay having a c = 90 kN/m². Given: diameter of piles (D) = 316 mm, center-to-center spacing of piles = 600 mm, and length of piles = 20 m. Find the allowable load-carrying capacity of the pile group. Use Table 9.10 and FS = 3. d Figure P9.27arrow_forward
- Find the maximum pile capacity for the pile group shown in figure below. If My = 500 kN.m and V = 7200 kN. 'My X=1.4 - x=1.4- y=1.2 y=1.2arrow_forwardA nine-pile group composed of 0.30 m diameter pipe piles is embedded 15 m in clay soil with conditions indicated by the sketch. 1. Det the total capacity if piles act individually 2. Find the total capacity if piles act as a group 3. Det the design load if factor of safety is 3. C = 42.81 kpa a = 0.85 6m C = 57.46 kpa a = 0.75 6m C = 95.76 kpa a = 0.5 Nc = 8 3m 0.75m 1-8 0.75m 上tt 0.75m 0.75marrow_forwardPlease answer 11.24arrow_forward
- Q1/ For the footing shown in Figure (1), estimate the pile group capacity. 0.6m dia bored pile Clay c=80 kN/m² y-17kN/m² S=1.5 m T L=12 marrow_forwardPlease answer 11.20arrow_forwardThe section of a 4 x 4 group pile in a layered saturated clay is shown in Figure P 9.29. The piles are square in cross section (356 mm x 356 mm). The center-to-center spacing (d) of the piles is 1 m. Determine the allowable load bearing capacity of the pile group. Use FS = 3 and Table 9.10.arrow_forward
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