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 18.2P
A 1500 kN load was applied on two 20 m long and 500 mm diameter driven piles that were instrumented for measuring the load variation with depth.
- a. The variation of frictional resistance per unit area f(z) with depth for the first pile is shown Figure 18.33a. Draw the variation of pile load Q(z) with depth.
- b. The variation of pile load Q(z) with depth for the second pile is shown Figure 18.33b. Draw the variation of frictional resistance per unit area f(z) with depth.
FIG. 18.33
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3. 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
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Ysat = 19.0 kN/m³
O' = 33°
Figure - 1
2.
Consider a group of 450 mm x 450 mm reinforced concrete piles were driven into
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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.
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3B
1
3
3.5B
b
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9.
10
11
a
3.5B
2
4
1.5B
1.5B
1.5B
1.5B
1.5B
1.5B
Figure Q2
Figure below shows a precast circular pile is driven into two clay stratums to a
depth of 14 m. the soil undrained shear strength properties are shown in the figure.
Determine the size of the pile if the allowable load for this pile and the factor of safety
is 99 kN and 2.5 respectively. (Take a as 1)
12 m
8 m
Ground level
Figure
at Om c= 30 kN/m²
at 12m → cu = 30 kN/m²
at 20m cu = 75 kN/m²
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 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_forwardDetermine the maximum load that can be allowed on a 450 mm diameter driven pile shown in Figure P12.6, allowing a factor of safety of 3. Use K = 1.5 Ko and = 0.65 in computing the shaft load. Use Meyerhofs method for computing the point load.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_forward
- A concrete bored pile has a diameter of 800 mm as given in the figure below. Calculate the ultimate load carrying capacity of the pile. -0.8- Clay Cu = 60 kN/m² Y = 18 kN/m³ %3D 4m G.W.T Sand 6m $ = 30° Y = 20 kN/m³ Clay Cu = 100 kN/m² Y = 20 kN/m³ 5marrow_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_forward5. a. Why do we sometimes need pile foundations for a substructure? b. Discuss the various installations methods for piles in caving and/or squeezing soils in deep foundations. c. A concrete pile is 15m long and has 406 mm diameter circular cross section. The pile is fully embedded in sand, for which the unit weight y =18 kN/m³ and the frictional angle o = 30°. Calculate the ultimate point load Qp. i. ii. Determine the total frictional resistance Qs. iii. Determine the total ultimate load of the pile. A concrete pile 500 mm by 500 mm square cross section is embedded in a saturated clay. The length of the embedment is 16m. The undrained cohesion, Cu of clay is 40 kN/m?, and the unit weight of the clay is 20 kN/m². Use a factor of safety of 5 to determine the allowable load the pile can carry. d.arrow_forward
- c. A concrete pile is 15m long and has 406 mm diameter circular cross section. The pile is fully embedded in sand, for which the unit weight y =18 kN/m³ and the frictional angle o = 30°. i. Calculate the ultimate point load Qp. ii. Determine the total frictional resistance Qs. iii. Determine the total ultimate load of the pile.arrow_forwardA 15 m long steel pipe pile of cross section of 0.6 m outside diameter is driven into a sand deposit. The pile penetration depth in sand deposit is 12 m. The pile is subjected to a lateral load of 45 kN at a height 3 m above the ground level. Known the information in the figure below, calculate the pile lateral deflection at the ground level (z = 0) and the pile bending moments at the depth of 1 m and 2 m below the ground level. Use the elastic solution method. Lateral Load Q = 45 kN 3.0 m z = 0 Ground Level Sand layer n = 10.5x103 kN/m³ 12.0 m Steel pipe pile E, = 20.0x10* MPa 4 = 1.0614x10-3 marrow_forwardA rectangular pile (0.5mx0.83m) is driven in a clayey soil arrangement composed of two different layers. The first layer has a height of 5m, cohesion of 58 kPa, friction factor of 0.84. Second layer has a height of 8m, cohesion of 76 kPa, and friction factor of 0.84. Compute the allowable load that the pile can carry if the factor it safety is 2.79.arrow_forward
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