Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Textbook Question
Chapter 18, Problem 18.23P
Figure 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. 18.39
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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°)
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 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.
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- Figure 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_forwardA 1500 kN load was applied on two 20 m long and 500 mm diameter driven piles that were instrumented for measuring the load variation with depth. a. The variation of frictional resistance per unit area f(z) with depth for the first pile is shown Figure 18.33a. Draw the variation of pile load Q(z) with depth. b. The variation of pile load Q(z) with depth for the second pile is shown Figure 18.33b. Draw the variation of frictional resistance per unit area f(z) with depth. FIG. 18.33arrow_forwardQuestion 3 A nine-pile group arranged in a square pattern is used as a foundation for a column in sand. Piles are 300 mm in diameter and placed at a spacing of 900 mm in each direction. What will be the settlement of pile group, if the settlement of single pile is 5 mm ?arrow_forward
- 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 Q5arrow_forward2. For the group of piles shown in Figure 2, determine the safe length of piles.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_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_forwardPiles are needed to support columns in a high rise building at a particular site. The probability of failure of a pile due to excessive axial load is estimated to be 10 Suppose that four soch piles are required under each colunas and there are 20 identical columns in the filding Assume that the failure of piles are statistically independent of mach other. (a) What is the probability that none of the piles under a column foundation will fail (b) What is the probability that none of the columns in a building will staffer damage due to p pile failure?arrow_forward11 A rectangular pile (0.67 x 0.5 m.) is driven in a clayey soil arrangement composed of two different layers. First layer has a height of 5 m., cohesion of 52 kPa, friction factor of 0.81. Second layer has a height of 6 m., cohesion of 70 kPa, and friction factor of 0.8. Compute the allowable load that the pile can carry if the factor of safety is 2.93. Round off to two decimal places.arrow_forward
- Problem01. A precast pile has a weight of 200 kg and is lifted at its end by a cord passing through a smooth pulley whose position is 2m above the left end of the pile and at a horizontal distance 1 m from the right end of the pile which is 6m long. If the pile is on the point of slipping when it makes an angle of 60 degree from the horizontal, determine the tension of the cord and the coefficient of friction between the pile and the horizontal plane. 5.2m 6 2(2arrow_forwardA 250 mm square, 15mm long prestressed concrete pile (fc = 40 mpa) was driven at a site in Amsterdam as described by Heijnen and Janse. A conventional load test conducted 31 days later produced the load -settlement curve shown in figure. Using Davisson's method, compute the ultimate load capacity of this pilearrow_forwardFigure below shows a precast circular pile is driven into two clay stratums to a depth of 14 m. the soil undrained shear strength properties are shown in the figure. Determine the size of the pile if the allowable load for this pile and the factor of safety is 99 kN and 2.5 respectively. (Take a as 1) 12 m 8 m Ground level Figure at Om c= 30 kN/m² at 12m → cu = 30 kN/m² at 20m cu = 75 kN/m²arrow_forward
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