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 18.4P
A 400-mm diameter and 15 m long concrete pile is driven into a sand where γ = 18.0 kN/m3 and ϕ′ = 31°. Assuming δ′ = 0.65ϕ′ and K = 1.4 Ko, determine the load carrying capacity of the pile with a factor of safety of 3.
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11.22 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
2.8
A 0.36-m square prestressed concrete pile is to be driven in a clayey soil. The design capacity of the pile is 360 kN, with a factor of safety of 2.00. The unconfined compression strength of clay is 115 kPa. Unit weight of clayey soil is 18 kN/m³. Which of the following most nearly gives the length of the pile in meters if the frictional constant is α = 0.76?
A 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.
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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- A 20-m-long concrete pile is shown in Figure P9.1. Estimate the ultimate point load Q, by a. Meyerhof's method b. Vesic's method c. Coyle and Castello's method Use m = 600 in Eq. (9.26). 9.1 Concrete pile 460 mm x 460 mm Loose sand di = 30° y = 18.6 kN/m3 20 m Dense sand d'2 = 42° y = 18.5 kN/m3 Figure P9.1arrow_forward12.2 A 20 m long concrete pile is shown in Figure P12.2. Estimate the ultimate point load Q, by a. Meyerhof's method b. Vesic's method c. Coyle and Castello's method Use m = 600 in Eq. (12.28). Concrete pile 460 mm X 460 mm Loose sand di = 30° y = 18.6 kN/m3 20 m F Dense sand $2 = 42° y = 18.5 kN/marrow_forwardQ- A pile of 0.50 m diameter and of length 10 m is embedded in a deposit of clay. The undrained strength parameters of the clay are cohesion = 60 kN/m² and the angle of internal friction = 0. Find the skin friction capacity (kN) of the pile for an adhesion factor of 0.6.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_forward1) A precast concrete pile with a cross-section of 350mm x 350mm is embedded in sand. The length of the pile is 15 meters. Assume that ysand= 15.8 kN/m², Øsand= 35°, and the relative density of sand is 70%. Estimate the allowable pullout capacity of the pile (FS=4). Xarrow_forwardDetermine the diameter of 70 ft long pile driven in the medium dense sand (Shown in Figure). Design load is 185Kips and factor of safety can be assumed to be 2.5. Frictional coefficient is 0.45 Sand y = 115lb/ft3 Ø = 28° K = 0.80 30 %3D Sand 128lb/ft %3! Ysat Ø= 30° K = 0.85 33°C 70arrow_forward
- Variation of N60 with depth in a granular soil deposit is given below. A concrete pile 9 m long with cross-section of 0.305m X 0.305m is driven into the sand. Then, estimate the allowable load-carrying capacity of the pile (Qallow). Use F.S.=4 and Meyerhof's equation for Qp and Qs. Depth (m) N60 1.5 4 3.0 4.5 7 6.0 7.5 16 9.0 18 10.5 21 11.0 24 12.5 20 14.0 19arrow_forward3. 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_forwardA 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_forward
- A 0.36-m square prestressed concrete pile is to be driven in a clayey soil. The design capacity of the pile is 360 kN, with a factor of safety of 2.00. The unconfined compression strength of clay is 115 kPa. Unit weight of clayey soil is 18 kN/m³. Which of the following most nearly gives the end bearing capacity of the pile in kN if N꜀ = 9?arrow_forwardA 0.36-m square prestressed concrete pile is to be driven in a clayey soil. The design capacity of the pile is 360 kN, with a factor of safety of 2.00. The unconfined compression strength of clay is 115 kPa. Unit weight of clayey soil is 18 kN/m³. Which of the following most nearly gives the skin friction expected to be develop along the shaft of the pile in kN?arrow_forwardA 450 mm x 450 mm concrete pile 20.0 m long is driven into sand deposits with y = 17 kN/m³ and = 30°. Find the ultimate load i.e. point load Qp by Meyerhoff's method and Janbu method. Meyerhoff's N = 55, Atmospheric pressure = 100 kN/m², Janbu's N = 18.4arrow_forward
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