Principles of Foundation Engineering, SI Edition
8th Edition
ISBN: 9781305723351
Author: Braja M. Das
Publisher: Cengage Learning US
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Chapter 9, Problem 9.11P
To determine
Find the ultimate skin friction resistance.
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PILE FOUNDATIONS
Example: 32/2
A reinforced concrete pile 30ft long and 15 inches
diameter is embedded in a saturated clay of very stiff
consistency. Laboratory tests on samples of undisturbed
soil gave an average undrained cohesive strength c
2500 lb/ft². Determine the net pullout capacity and the
allowable pullout load with F, =3.
Take, alpha = 0.37
Estimate the side resistance Qs by:
a. Using Eqs. (9.40) through (9.42). Use K = 1.5 and 8 = 0.60
b. Coyle and Castello's method [Eq. (9.44)]
20 m
Concrete pile
460 mm x 460 mm
Loose sand
$₁ = 30°
y = 18.6 kN/m³
Dense sand
$2=36
y = 18.5 kN/m³
12.2 A 20 m long concrete pile is shown in Figure P12.2.
Estimate the ultimate point load Q, by
a. Meyerhof's method
b. Vesic's method
c. Coyle and Castello's method
Use m = 600 in Eq. (12.28).
Concrete pile
460 mm X 460 mm
Loose sand
di = 30°
y = 18.6 kN/m3
20 m
F
Dense sand
$2 = 42°
y = 18.5 kN/m
Chapter 9 Solutions
Principles of Foundation Engineering, SI Edition
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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- 8. Plot the consolidation curve for the data given below and determine the preconsolidation stress (o'c). Note: tsf = tons per square foot. tsf e 0.25 0.93 0.5 0.92 0.9 2 0.88 4 0.84 1 8 0.75 16 0.59 32 0.38 4 0.43 1 0.48 9. For the plot in problem 8, determine Cr and Cc.arrow_forward12.20 A 600 mm diameter and 25 m long driven concrete pile car- ries a column load of 1200 kN. It is estimated that the shaft carries 900 kN and the point carries 300 kN. Determine the settlement of the pile head using the Poulos and Davis method with the following data: E = 25 MN/m², Ep = 30,000 MN/m², and μ = 0.2arrow_forwardRefer to the pile shown in Figure P 9.1. Estimate the side resistance Qs bya. Using Eqs. (9.40) through (9.42). Use K = 1.5 and ẟ' = 0.6 Φ'b. Coyle and Castello’s method [Eq. (9.44)]arrow_forward
- A 450 mm x 450 mm concrete pile 20.0 m long is driven into sand deposits with y = 17 kN/m³ and = 30°. Find the ultimate load i.e. point load Qp by Meyerhoff's method and Janbu method. Meyerhoff's N = 55, Atmospheric pressure = 100 kN/m², Janbu's N = 18.4arrow_forwardA driven closed-ended pile, circular in cross section, is shown in Figure P 9.4.Calculate the following.a. The ultimate point load using Meyerhof’s procedure.b. The ultimate point load using Vesic’s procedure. Take Irr = 50.c. An approximate ultimate point load on the basis of parts (a) and (b).d. The ultimate frictional resistance Qs. [Use Eqs. (9.40 (L' ≈ 15 D)) through (9.42), and take K = 1.4 and ẟ' = 0.6 Φ'.]e. The allowable load of the pile (use FS = 4).arrow_forwarda. The following are the results of a consolidation test. Pressure o' (kN/m²) 480.. e 1.21 1.195 1.15 1.06 0.98 0.925 25 50 100 200 400 500 1. Plot the e-log o' curve. (use a French curve to construct) 2. Using Casagrande's graphical method, determine the preconsolidation pressure. 3. Calculate the compression index, Cc, from the laboratory e-log o' curve.arrow_forward
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