Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.31P
Redo Problem 12.30 assuming that the water table coincides with the top of the fill and that γsat(fill) = 19.8 kN/m3. If the other quantities remain the same, what would be the downward drag force on the pile? Assume δ' = 0.5ϕ′fill.
12.30 Figure 12.49a shows a pile. Let L = 15 m, D (pile diameter) 305 mm, Hf = 3 m, γfill = 17.5 kN/m3, and ϕ′fill = 25°. Determine the total downward drag force on the pile. Assume that the fill is located above the water table and that δ′ = 0.5ϕ′fill.
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Refer 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)]
Redo Problem 9.23 assuming that the water table coincides with the top of the fill and that γsat(fill) = 19.8 kN/m3. If the other quantities remain the same, what would be the downward drag force on the pile? Assume ẟ' = 0.5 Φ'fill.
Consider a drilled, rough concrete pile with diameter B = 1m and length D = 10m embedded in a site
underlain by a 5m thick layer of sand with fiction angle = 41 degrees and Ko = 0.5 that lies over an 8m
thick layer of clay with fiction angle = 36 degrees, Ko = 0.38, and Su = 70 kPa.
a. Determine the long term end bearing capacity of the pile.
b. Determine the long term capacity of the pile.
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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- A pile of diameter 0.4 m is fully embedded in a clay stratum having 5 layers, each 5 m thick as shown in the figure below. Assume a constant unit weight of soil as 18 kN/m³ for all the layers. Using method (= 0.15 for 25 m embedment length) and neglecting the end bearing component, the ultimate pile capacity (in kN) is G Y=18kN/m³- for all layers 7XXX 5m 5m 5m 5m 5m = 25 m 0.4m, c=40 kPa c=50 kPa c=60 kPa c=70 kPa c=80 kPa S XXXXarrow_forwardA bored pile is shown in the figure. The diameter of the pile is 60 cm. Calculate the ultimate bearing capacity of the pile. Assume Dor=20x), the pile soil motion angle, 8=0.75*8' Sand c'=0, 0-30° 10m 8=20 kN/m Clay Cu = 100kpa X=20kN/m3 5marrow_forwardRefer to Figure 18.26b. Let L = 15.24 m, fill = 17.29 kN/m3, sat(clay) = 19.49 kN/m3, clay = 20, Hf = 3.05 m, and D = 0.406 m. The water table coincides with the top of the clay layer. Determine the total downward drag on the pile. Assume that = 0.6 clay. FIG. 18.26 Negative skin frictionarrow_forward
- Refer to Figure 18.13. Given L1 = 1.5 m, L2 = 3 m; for the sand, =33, =16.5kN/m3, sat=19.0kN/m3; and, for the clay, c=50kN/m2, =0, sat=20kN/m3. Determine the depth of sheet pile required, allowing for a 50% increase from the theoretical estimate.arrow_forward2. Consider a group of 450 mm x 450 mm reinforced concrete piles were driven into thick loose sand layer with the average unit weight and internal friction angle of 16 kN/m3 and 30°, respectively. Estimate the group pile capacity with the arrangement as shown in Figure Q2 if the length of pile embedment is 30 m assuming ground water table is far below the ground surface. Use 8 = 0.80 and K = 1.5Ko. 3B 3B 3B 1 3 3.5B b 'P 9. 10 11 a 3.5B 2 4 1.5B 1.5B 1.5B 1.5B 1.5B 1.5B Figure Q2arrow_forward3. Determine the maximum load that can be allowed on a 45cm x 45cm diameter bored pile shown in Figure-1 allowing a factor of safety of 3. Take SPT value at the bottom of pile 40. Sand y = 17.0 kN/m o' = 31° 8 m Sand 10 m Ysat = 19.0 kN/m³ O' = 33° Figure - 1arrow_forward
- 3. A concrete pile 15.24 m long having a cross section of 406 mm × 406 mm is fully embedded in a saturated clay layer for which Ysat 19.02 kN/m³, Ø = 0, and cu=76.7 kN/m². Determine the allowable load that the pile can carry (Assuming FS-3). Use the a method to estimate the skin friction and Vesic's method for point load estimation.arrow_forwardQ-8: The following figure shows the flow net for seepage of water around a single row of sheet piles driven into a permeable layer. Calculate how deep the sheet pile should be driven (h) to achieve factor of safety = 3 against downstream heave, given that sat for the permeable layer = 18 kN/m3. (Note: Thickness of permeable layer T = 18 m) Sheet pile H1 = 10 m H2 = 2 m Ysat = 18 kN/m³ Heave zone Impermeable layerarrow_forwardThe 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.arrow_forward
- 12.10 A concrete pile 15.24 m long having a cross section of 406 mm × 406 mm is fully embedded in a saturated clay layer for which Ysat = 19.02 kN/m³, p = 0, and c₂ = 76.7 kN/m². Determine the allowable load that the pile can carry. (Let FS = 3.) Use the a method Eq. (12.61) and Table 12.11 to estimate the skin friction and Vesic's method for point load estimation.arrow_forwardFind the maximum pile capacity for the pile group shown in figure below. If My = 500 kN.m and V = 7200 kN. 'My X=1.4 - x=1.4- y=1.2 y=1.2arrow_forwardProblem 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_forward
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