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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The 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.
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Question 17
A group of 9 piles of 33 cm diameter is arranged in a square configuration with a center-to-center spacing of 1.44 m. The length of the piles is 12 m. Unit cohesion of the clay is 78 kPa. Determine the ultimate group capacity of the pile group based on block failure. Assume adhesion factor of 0.61. Round off to two decimal places.
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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- 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_forwardConsider a 500 mm diameter pile having a length of 18 m in a clay. Given: γ = 20.0 kN/m3 and cu = 60 kN/m2. Determine the maximum allowable load (Qall) with FS = 3. Use the α method and Table 12.11 for determining the skin friction and Eq. (12.20) for determining the point load. Allow a factor of safety of 3. What percentage of the ultimate load is being carried by the pile shaft? Is it a friction pile?arrow_forwardDetermine 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_forward
- The plan of a group pile is shown in the figure. Assume that the piles areembedded in a saturated homogeneous clay having a cu=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. Using FS=3 and table.arrow_forwardA group of 9 piles of 29 cm diameter is arranged in a square configuration with a center-to-center spacing of 1.01 m. The length of the piles is 12 m. Unit cohesion of the clay is 80 kPa. Determine the ultimate group capacity of the pile group based on block failure. Assume adhesion factor of 0.69.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
- Estimate the allowable load capacity of a 0.5-mdiameter steel closed-ended pipe pile embedded 17 m in the soil profile shown in Figure . The factor of safety required is 2. The N values are blows/ft as shown in table given. Compare the load capacity for a driven pile and a drilled shaft.arrow_forwardA group of 9 piles of 30 cm diameter is arranged in a square configuration with a center-to-center spacing of 1.3 m. The length of the piles is 11 m. Unit cohesion of the clay is 78 kPa. Determine the ultimate group capacity of the pile group based on block failure. Assume adhesion factor of 0.75. Round off to two decimal places.arrow_forwardA concrete pile 50 ft long having a cross section of 15 in. x 15 in. is fully embedded in a saturated clay layer for which γsat = 121 lb/ft3, Φ = 0, and cu = 1600 lb/ft2. Determine the allowable load that the pile can carry. (Let FS = 3.) Use the a method Eq. (9.59) and Table 9.10 to estimate the skin friction and Vesic’s method for point load estimation.arrow_forward
- A 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_forwardEstimate the group efficiency of a 4 x 6 pile group, consisting of 400 mm diameter concrete piles at 1.2 m center-to-center spacing using a. the Converse-Labarre equation b. the Los Angeles Group Action equationarrow_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
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