Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN: 9781305081550
Author: Braja M. Das
Publisher: Cengage Learning
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Chapter 9, Problem 9.15P
A steel pile (H-section; HP 310 × 125; see Table 12.1a) is driven into a layer of sandstone. The length of the pile is 25 m. Following are the properties of the sandstone: unconfined compression strength = qu(lab) = 80 MN/m2 and angle of friction = 36°. Using a factor of safety of 3, estimate the allowable point load that can be carried by the pile. Use [qu(design) = qu(lab)/5].
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I need detailed explanation solving this exercise from Foundation Engineering, step by step please.
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,
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Chapter 9 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 9 - A 20 m long concrete pile is shown in Figure...Ch. 9 - Refer to the pile shown in Figure P9.1. Estimate...Ch. 9 - Prob. 9.3PCh. 9 - A driven closed-ended pile, circular in cross...Ch. 9 - Prob. 9.5PCh. 9 - Prob. 9.6PCh. 9 - Prob. 9.7PCh. 9 - Prob. 9.8PCh. 9 - Prob. 9.9PCh. 9 - A concrete pile 16 in. 16 in. in cross section is...
Ch. 9 - Prob. 9.11PCh. 9 - Solve Problem 12.13 using Eqs. (12.59) and...Ch. 9 - Prob. 9.13PCh. 9 - Prob. 9.14PCh. 9 - A steel pile (H-section; HP 310 125; see Table...Ch. 9 - A concrete pile is 20 m long and has a cross...Ch. 9 - Prob. 9.17PCh. 9 - Prob. 9.18PCh. 9 - Solve Problem 12.23 using the method of Broms....Ch. 9 - Prob. 9.20PCh. 9 - Solve Problem 12.25 using the modified EN formula....Ch. 9 - Solve Problem 12.25 using the modified Danish...Ch. 9 - Figure 12.49a shows a pile. Let L = 15 m, D (pile...Ch. 9 - Redo Problem 12.30 assuming that the water table...Ch. 9 - Refer to Figure 12.49b. Let L = 18 m, fill = 17...Ch. 9 - A concrete pile measuring 16 in. × 16 in. in cross...Ch. 9 - The plan of a group pile is shown in Figure...Ch. 9 - Prob. 9.28PCh. 9 - The section of a 4 × 4 group pile in a layered...Ch. 9 - Prob. 9.30P
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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_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_forwardA single pile of diameter 50 cm and length 10 m is driven into clay having unconfined compressive strength of 100 kN/m2. The ultimate load bearing capacity of the pile considering end bearing also will be Nc = 7, a = 0.7). kN. (Take, %3Darrow_forward
- QUESTION 3 A concrete pile is driven into top two layers of subsoil strata made of 10m and 5m thick saturated clays respectively. The pile's diameter is 500 mm throughout the pile. Determine the allowable bearing capacity of the pile. The subsoil properties are shown. (Answer 454 kN). Clay layer 1: Saturated unit weight of clay = 18kN/m3 Average undrained shear strength = 100kPa, o = 0 %3D Adhesion factor = 0.48 Clay layer 2: Saturated unit weight of clay = 19kN/m3 Average undrained shear strength = 120kPa, q = 0 Adhesion factor = 0.42, Nc = 9.arrow_forwardA concrete pile 20 m long having a cross section of 0.46 m × 0.46 m is fully embedded in a saturated clay layer. For the clay, given: Yat = 18 kN/m², = 0, and Cu = 80 kN/m?. Determine the allowable load that the pile can carry (FS = 3). Use %3D the A method to estimate the skin resistance.arrow_forwardA 10m long and 0.8m diameter precast concrete pile is driven into a saturated clay deposit as shown in the figure below. The groundwater table is at the ground surface. For the ratio of the undrained shear strength to vertical effective pressure is approximated as follows: = 0.11 + 0.0037(PI) NC (9- 9 (OCR)8 OC Determine the bearing capacity for the pile by the a) Alpha (a) method. b) Lambda (A) method Depth, m Layer 1 OCR = 5, Yat = 19.5 kN/m³, Pl = 35 Layer 2 OCR = 1.5, %at = 19.0 kN/m, Pl = 25 Layer 3 OCR = 8, %at = 19.5 kN/m, Pl = 20 10 D, = 0.8 m D 10 marrow_forward
- Find the force F in the image below such that the deep pile foundation under the structure frame (under the pinned support) is not under tension. (All measurements are in the metric system) F→→ w = 10 ton/m -5.00 4.00arrow_forwardShow a detailed step by step solutionarrow_forwardA 400 mm x 400 mm square precast concrete pile of 15 m length is driven into a sand where γ = 18.0 kN/m3 and Φ' = 33°. Assume δ' = 0.7 and K=1.4Ko determine the load-carrying capacity of the pile with a FS=3. Using Meyerhof's method, Qp=Apq'Nq*≤Apql for computing the point load-carrying capacity Qp, Equations, L'≈15D and f=Kσ'otanδ' for computing the load-carrying capacity of the pile shaft Qs.arrow_forward
- Please show how to solve this problemarrow_forwardage Please round to the nearest Hundredth (i.e., 0.01). No Comma! A square pile, 21 m long is driven into a homogeneous sand layer. The pile's width (diameter) is 0.4 m. The standard penetration resistance near the vicinity of the pile is 29. Use FS = 2 and Briaud & Tucker method. Point force, Qp = Skin friction force, Qs = Q A Ultimate bearing force, Qu = Allowable bearing force, Qa = F1 2 W S F2 kN #3 20 F3 E D kN S4 kN $ KN 000 000, F4 R F % 5 F5 T MacBook Air A 6 G Y ✓ & 7 H U ► 11 * 8 J F8 Next page 1 9 Karrow_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_forward
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