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 12.8P
Consider 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.
- a. 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.
- b. What percentage of the ultimate load is being carried by the pile shaft? Is it a friction pile?
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the A method to estimate the skin resistance.
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)]
A 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.
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 20 m long concrete pile is shown in Figure P12.2. Estimate the ultimate point load Qp by a. Meyerhofs method b. Vesics method c. Coyle and Castellos method Use m = 600 in Eq. (12.28).arrow_forward12.10 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_forwardA 20-m-long concrete pile is shown in Figure P9.1. Estimate the ultimate point load Qp bya. Meyerhof’s methodb. Vesic’s methodc. Coyle and Castello’s methodUse m = 600 in Eq. (9.26).arrow_forward
- 7. If a 45 cm diameter pipe pile is driven into clayey soil to a depth of 12 m. (a) what would the allowable load capacity (Q) be? The water table is 2 m below the ground surface and the soil profile consists of two clay layers (refer to the figure below). Use the ß method to calculate skin friction and the R=30° for all clay layers. (b) Explain how you selected FS value you use. 12 m ▶ 9m 2m 45 cm Y = 18.5kN/m³ = 30kN/m² Ysat = 19kN/m³ C₂ = 30kN/m² Ysat = 20kN/m² S = 60kN/m²arrow_forward7. If a 45 cm diameter pipe pile is driven into clayey soil to a depth of 12 m. (a) what would the allowable load capacity (Q) be? The water table is 2 m below the ground surface and the soil profile consists of two clay layers (refer to the figure below). Use the ß method to calculate skin friction and the R=30° for all clay layers. (b) Explain how you selected FS value you use. 12 m 9m 2 m 45 cm Y = 18.5kN/m²³ C= 30kN/m² Ysat = 19kN/m³ Cu = 30kN/m² Ysat = 20kN/m² S = 60kN/m²arrow_forwardProblem #1 A 20-m-long concrete pile is shown Below. Estimate the ultimate point capacity Op by: a. Meyerhof's method b. Vesic's method c. Coyle and Castello's method Use m= 600 in Eq. (9.26). Estimate the side resistance Qs by: a. Using Eqs. (9.40) through (9.42). Use K = 1.5 and 8 = 0.60 b. Coyle and Castello's method [Eq. (9.44)] l-20 m Concrete pile 460 mm X 460 mm Loose sand $₁ = 30° y = 18.6 kN/m³ 18.6x2 = 372 kr/m² Dense sand $2 = 36 y = 18.5 kN/m²arrow_forward
- A 30 m long concrete pile is 305 mm times 350 mm in cross section and is fully embedded in a sand deposit. Using Broms' method, calculate the allowable lateral load Q_g (take FS = 2) at the ground level. Assume the pile is flexible and restrained. Let the soil unit weight, gamma = 16 kN/m^3, the soil friction angle, Phi' = 30^degree; and the yield stress of the pile material, F_y = 21 MPa,arrow_forward11.22 A concrete pile measuring 0.406 m X 0.406 m in cross section is 18.3 m long. It is fully embedded in a layer of sand. The following is an approximation of the me- chanical cone penetration resistance (q.) and the friction ratio (F) for the sand layer. Estimate the allowable bearing capacity of the pile. Use FS = 4. Depth below ground surface (m) 9. (kN/m²) F, (%) 0-6.1 2803 2.3 6.1-13.7 3747 2.7 13.7-19.8 8055 2.8arrow_forwardQ1: Determine the allowable load capacity for the driven pile of 0.6 m diameter embedded in a layered soil as shown in the figure below, use F.S 2.0 , K, = 1.5 and tand =0.5? ELEV. 110 N.C.C W.T ELEV. 108 Cu =70 kPa Y = 17 kN/m3 a = 1, yw = 10 kN/m? ELEV. 102 O.C.C, Cu 180 kPa, y = 20 kN/m³ a = 0.45 ELEV. 98 Sandy Layer Yt = 19 kN/m3 Ø = 32° Nq = 23.18 ELEV. 90arrow_forward
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