Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 18, Problem 18.17P
To determine
Find the penetration value of the pile per hammer blow using the Modified ENR formula.
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Engineering / Civil Engineering / Prin... / A 20 m long concre...
: A 20 m long concrete pile is shown in F...
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
d - 30
y- 18.6 kN/m
20 m
Dense sand
d2- 42
y- 18.5 kN/m
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II
QUESTION 3:
Three forces act on a pile as shown. If the resultant of the three forces is equal to 500 N and is directed
vertically, what is the magnitude and direction of F3.
F2= 100 N
F3
F,= 75 N
35°
40°
Pile
(Answer: F3=365 N, E=76.8°)
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
5m
Chapter 18 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 18 - State whether the following are true or false. a....Ch. 18 - A 1500 kN load was applied on two 20 m long and...Ch. 18 - A 500 mm diameter and 20 m long concrete pile is...Ch. 18 - A 400-mm diameter and 15 m long concrete pile is...Ch. 18 - A 400 mm 400 mm square precast concrete pile of...Ch. 18 - Prob. 18.6PCh. 18 - Prob. 18.7PCh. 18 - Prob. 18.8PCh. 18 - Determine the maximum load that can be allowed on...Ch. 18 - Prob. 18.10P
Ch. 18 - Redo Problem 18.10 using the method for...Ch. 18 - Determine the maximum load that can be allowed on...Ch. 18 - Prob. 18.13PCh. 18 - A steel pile (H-section; HP 360 1.491; see Table...Ch. 18 - A concrete pile is 18 m long and has a cross...Ch. 18 - Prob. 18.16PCh. 18 - Prob. 18.17PCh. 18 - Prob. 18.18PCh. 18 - Prob. 18.19PCh. 18 - Figure 18.26a shows a pile. Let L = 20 m, D = 450...Ch. 18 - Refer to Figure 18.26b. Let L = 15.24 m, fill =...Ch. 18 - Prob. 18.22PCh. 18 - Figure 18.39 shows a 3 5 pile group consisting of...Ch. 18 - The section of a 4 4 group pile in a layered...Ch. 18 - Prob. 18.25PCh. 18 - Prob. 18.26CTP
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- Problem 1. A 12-m-long 356-mm-diameter concrete pile is shown in Figure below. Estimate the allowable capacity, Qaul, of the pile. Use K = 1.3 Ko, 8' = 0.8 Ø' and a factor of safety equal to 3. 12 m Concrete pile 356 mm Loose sand $₁ = 30° y = 17.5 kN/m³ Dense sand $2 = 42° y = 18.5 kN/m³arrow_forwardd. Starting out from the condition where the water table is above the excavation line on both sides of the sheet pile, if we pumped the water out...but only on the excavation side (see figure below), would you expect the moment induced in the sheet pile to increase or decrease? Consider short-term, immediate effects only. Explain your answer. y (pcf) H (ft) Ysat (pcf)arrow_forwardH.O 9 A 20-m-long concrete pile is shown in Figure below. Estimate the ultimate point load Q, by a. Meyerhof's method b. Coyle and Castello's method Concrete pile 460 mm x 460 mm Loose sand 20 m Dense sand 42 y 18.5 KN/marrow_forward
- For the soil profile shown in figure below, the minimum number of precast concrete piles o 300 mm diameter required to safely carry the load for a given factor of safety of 2.5 (assuming100% efficiency for the pile group) is equal to 5000 KN 10 m Stiff clay Cu = 150 ka Medium stiff clay CU-100 kPa Q = 0.57arrow_forwardA square concrete pile of 10 m length is driven into a deep layer of uniform homogeneous clay. The average unconfined compressive strength of the clay, determined through laboratory tests on undisturbed samples extracted from the clay layer, is 100 kPa. If the ultimate compressive load capacity of the driven pile is 632 kN, the required width of the pile is mm. (in integer) (Bearing capacity factor Nc = 9; adhesion factor a = 0.7)arrow_forwardA drop hammer is used to drive a wooden pile The hammer weight is 25 N and its free falling height is 0.8m. The penetration in the last blow is 12 mm. What is the nearest approximation to the load carrying capacity of the pie according to the Engineering News Formula?arrow_forward
- A 12 inch diameter concrete pile is to be driven into a clay deposit as shown in Figure 2. The pile's design capacity is 30 tons. Determine the length of the pile to carry that 30 tons load if the factor of safety is 2. O Design = 30 tons L = ? Clay Unconfined Compression Strength, qu= 4800 psf Y = 126 pcf - - 12 in. Diameterarrow_forwardA 50 cm square precast pile is driven by 9 m into a sandy soil. The standard penetration test results, prformed on this ground, are given in the table below: Depth below ground surface (m) SPT (Nss) 1.5 3.0 4.5 4 6 6.0 12 12 20 24 35 39 If the skin resistance is equal to {T, = 2 x (average Nss along the pile shaft)) kPa. Compute the factor of safety available, if 1100 kN of compressive load is applied on this pile. 7.5 9.0 10.5 12.0arrow_forwardA static load test has been conducted on a 60 ft long, 16 in square reinforced concrete pile which has been driven from a barge through 20 ft of water, then 31 ft into the underlying soil. Telltale rods A and B have been embedded at points 30 ft and 59 ft from the top of the pile, respectively. The data recorded at failure was as follows: Load at head = 139,220 lb, settlement at head = 1.211 in, settlement of telltale rod A = 1.166 in, settlement of telltale rod B = 1.141 in. Use the data from telltale rod A to compute the modulus of elasticity of the pile, then use this value and the remaining data to compute q'n and the average fn value. Hint: Telltale rod A is anchored only 1 ft from the mud line (the top of the soil). There is essentially no side friction resistance between the top of the pile and this point, so the force at a depth of 30 ft is essentially the same as that at the top of the pile.arrow_forward
- A 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_forwardThe wooden pile shown in the figure has a diameter of 105 mm and is subjected to a load of P = 70 kN. Along the length of the pile and around its perimeter, soil supplies a constant frictional resistance of w = 3.85 kN/m. The length of the pile is L = 4.0 m and its elastic modulus is E= 12.9 GPa. Calculate (a) the force Fg needed at the base of the pile for equilibrium. (b) the magnitude of the downward displacement at A relative to B. y L Answers: (a) FB = (b) UA= i i B FB KN mmarrow_forwardA drop hammer is used to drive a wooden pile. The hammer weight is 30 kN and its free falling height is 0.9 m. The penetration in the last blow is 14 mm. The load carrying capacity of the pile (to the nearest integer) according to the Engineering News formula is kN.arrow_forward
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