Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Textbook Question
Chapter 12, Problem 12.36P
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.
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A group of piles are arranged as shown in the figure. The piles are square in section with sides equal to 400 mm and has a spacing of 1.80 m on centers. One pile has a total length of 18 m. Unit weight of clay is 19.7 kN/m3 and has a cohesion of 90 kPa. Ground water table is located at depth of 20 m below the ground surface. Adhesion factor is 0.90. Determine the ultimate load – bearing capacity of the group of piles considering the piles acting individually.
A square pile group of 16 piles penetrates through a filled up soil of 3 m depth. The pile
diameter is 250 mm and pile spacing is 0.75 m. The unit cohesion of the material is 18
kN/m² and the unit weight of the soil is 15 kN/m². Compute the drag down force on the
group.
QUESTION 5
Calculate the load bearing capacity of the pile shown in Figure Q5.
Assume that it is a bored pile, and state other assumptions made.
0.6 m
Firm Clay
Y. = 18KN/m2
= 40 kPa
3m
Stiff Clay
Y, = 19kN/m³
Cu = 110 kPa
2.5m
WT
13m
Dense Gravel
Y. = 21kN/m²
o' = 37°
15m
Figure Q5
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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- 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°)arrow_forwardA concrete pile group 3x3 with spacing of 0.6m is used to support a wind turbine in a sand deposit. Individual pile diameter = 0.3 m and length=6m. A. If the allowable (working) lateral capacity for a single pile is 95 kN, what is the maximum allowable lateral deflection for each pile? B. Is the lateral deflection acceptable? Explain your answer in 1-2 sentences.arrow_forwardA group of 25 HP 10 * 57 piles are arranged in a 5 * 5 grid at 27 inches on center and driven to a depth of 60 ft. The soil is a clay with unit side friction resistance, fn of 2000 lb/ft2 and a unit toe bearing resistance, q'n , of 15,000 lb/ft2. Determine whether individual or block failure controls the design, and determine the nominal capacity of the pile group, Png.arrow_forward
- 6) A 2-ft x 2-ft square concrete pile is shown. Ignore the resistance of the soft clay. Assume Na 10. For a safety factor of 3.0, the allowable load capacity of the pile is most nearly: a. 344 kips b. 169 kips c. 128 kips d. 225 kips 5 ft 30 ft R SOFT CLAY y=120 pcf SAND Y = 115 pcf =32°arrow_forwardA 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 kNarrow_forwardA 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_forward
- Problem 2. A concrete pile 16 in. × 16 in. in cross section is shown in Figure below. Calculate the allowable capacity, Qall, of the pile using the a method. Assume a factor of safety equal to 3. 20 ft 40 ft 16 in. Water table Silty clay Y = 118 lb/ft³ Cu = 700 lb/ft² Silty clay Ysat = 122.4 lb/ft³ Cu = 1500 lb/ft²arrow_forwardIn a piled raft, 450 mm diameter and 13 m long piles are placed in a rectangular grid at 1.60 m 1.63 m spacing. Find the pile-raft interaction factor assuming uniform soil conditions with depth andarrow_forwardFigure 18.39 shows a 3 5 pile group consisting of 16 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 center-to-center spacing of 1200 mm. FIG. 18.39arrow_forward
- Determine the maximum load that can be allowed on the 450 mm diameter pile shown in Figure 18.36, with a safety factor of 3. Use the a method for computing the shaft friction. FIG. 18.36arrow_forwardRefer to the pile shown in Figure P9.1. Estimate the side resistance Qs by Using Eqs. (9.40) through (9.42). Use K = 1.5 and Coyle and Castello’s method [Eq. (9.44)]arrow_forwardDetermine the maximum load that can be allowed on the 450 mm diameter pile shown in Figure P12.9, with a factor of safety of 3. Use the α method and Table 12.11 for determining the skin friction and Eq. (12.20) for determining the point load.arrow_forward
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