Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 18, Problem 18.16P
To determine
Find the allowable load
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A 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 m
For the (4 x 4) pile group as shown in the figure, the settlement of pile group, in a normally consolidated
clay stratum having properties as shown in the figure will be
(Load dispersion = 2 H:1 V)
mm.
900 kN
G
Normally consolidated clay
Yat = 20 kN/m
6 m
w̟ = 40%
8 m
w, = 25%
e, = 1.05
Hard stratum
250 mm
Piles are spaced at 0.5 m c/c.
Diameter of piles is 250 mm
0.5 m
0.5 m
Top view
d. Starting out from the condition where the water table is above the excavation line on
both sides of the sheet pile, if we pumped the water out...but only on the excavation
side (see figure below), would you expect the moment induced in the sheet pile to
increase or decrease? Consider short-term, immediate effects only. Explain your
answer.
y (pcf)
H (ft)
Ysat (pcf)
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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- Concrete pile 356mm x 356mm Loose sand 1-30° 7-17.5kN/m 12 m Dense sand =42 0 y-18.5 kN/m A square concrete pile12m long is shown in Figure. Estimate the following: Ultimate shaft carrying capacity by Meyerhof's Method 471 kN 784.6 kN O 319.5kN 576.5 kN O 141.7 kNarrow_forwardA 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 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
- H.O 9 A 20-m-long concrete pile is shown in Figure below. Estimate the ultimate point load Q, by a. Meyerhof's method b. Coyle and Castello's method Concrete pile 460 mm x 460 mm Loose sand 20 m Dense sand 42 y 18.5 KN/marrow_forward11.10 A concrete pile 0.406 m x 0.406 m in cross section is shown in Figure P11.10. Calculate the ultimate skin friction resistance by using the a. a method b. A method c. ẞ method Use =20° for all clays, which are normally consolidated. 6.1 m 12.2 m 0.406 m Figure P11.10 Groundwater table Ysat Silty clay 18.55 kN/m³ Cu = 35 kN/m² Silty clay Ysat = 19.24 kN/m³ Cu = 75 kN/m²arrow_forwardThe group pile below is to be built in normally consolidated clay. Calculate the consolidation settlement in cm. Cap Size: B = 4 m; L = 5 m Group Pile Dimensions: Bg = 3 m; Lg = 4 m ; cm³ Y = 1.8 gr Clay Parameters: Ysat = 2.gr 9 m 1 m 4 m cm3 m₂ = 3.75 * 10-3 m² /ton 150 ton Saturated Clay Sandarrow_forward
- Problem 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_forwardA steel H-pile (section HP13 × 100) is driven by a hammer. The maximum rated hammer energy is 40 kip-ft, the weight of the ram is 12 kip, and the length of the pile is 90 ft. Also, we have coefficient of restitution pile cap = 2.4 kip, hammer efficiency = 0.85, number of blows for the last inch of penetration = 10, and E, = 30 × 10° lb/in.?. Estimate the pile capacity using Eq. (9.114). Take FS = 6. 0.35, weight of the %3Darrow_forwardA group pile in clay is shown in the figure below. Determine the maximum vertical load Qg be applied if the allowable consolidation settlement of the pile group is set to be 0.17 m. Use the 2:1 stress distribution method to estimate the average effective stress in the clay layer. can Qg 3 m Sand Groundwater y = 15.72 kN/m3 table Sand 3 m Ysat = 18.55 kN/m3 2.75 m X 2.75 m Group plan Normally consolidated clay Ysat = 19.18 kN/m³ 15 m 18 m eo = 1 C. = 0,8 Normally consolidated clay Ysat = 19 kN/m3 eo = 0.25, C. =1 5 m Rockarrow_forward
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