3 The plan of a group pile is shown in Figure P11.23. Assume that the piles are embedded in a saturated homogeneous clay having a c, = 86 kN/m². Given: diameter of piles (D) = 316 mm, center-to-center spacing of piles = 600 mm, and length of piles = 20 m. Find the allowable load-carrying capacity of the pile group. Use FS = 3.

3 The plan of a group pile is shown in Figure P11.23. Assume that the piles are embedded in a saturated homogeneous clay having a c, = 86 kN/m². Given: diameter of piles (D) = 316 mm, center-to-center spacing of piles = 600 mm, and length of piles = 20 m. Find the allowable load-carrying capacity of the pile group. Use FS = 3.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter18: Pile Foundation

Section: Chapter Questions

Problem 18.20P: Figure 18.26a shows a pile. Let L = 20 m, D = 450 mm. Hf = 4m, f = 17.5 kN/m3, fill = 25. Determine...

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The plan of a group pile is shown in the figure. Assume that the piles areembedded in a saturated homogeneous clay having a cu=90 kN/m2 . Given: Diameter of piles (D)=316 mm, center-to-center spacing of piles=600 mm, and length of piles= 20 m. Find the allowable load-carrying capacity of the pile group. Using FS=3 and table.
9.27 The plan of a group pile is shown in Figure P9.27. Assume that the piles are embedded in a saturated homogeneous clay having a c = 90 kN/m². Given: diameter of piles (D) = 316 mm, center-to-center spacing of piles = 600 mm, and length of piles = 20 m. Find the allowable load-carrying capacity of the pile group. Use Table 9.10 and FS = 3. d Figure P9.27
2. Consider a group of 450 mm x 450 mm reinforced concrete piles were driven into thick loose sand layer with the average unit weight and internal friction angle of 16 kN/m3 and 30°, respectively. Estimate the group pile capacity with the arrangement as shown in 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. 3B 3B 3B 1 3 3.5B b 'P 9. 10 11 a 3.5B 2 4 1.5B 1.5B 1.5B 1.5B 1.5B 1.5B Figure Q2
The plan of a group pile is shown in the Figure below. Assume that the piles are embedded in a saturated homogeneous clay having a c, = 86 kN/m?. Given: diameter of piles (D) = 316 mm, center-to-center spacing of piles d = 790 mm, and length of piles = 20 m. Find the allowable load-carrying capacity of the pile group. Use FS = 3. (pa 100 kPa) Qu1) = n,n: [94,0(2) +Ea'pc,AL| Q.e) = L,B,CN+E2(L, + B, )e,AL u(p) 'c If Qu(1) < Qu@), then Q, = Qu)7 Number of piles in group: n,×n2 D 7 =1– 7, (n, – 1) + n, (n, – 1)+ vZ (n – 1)(n, – 1)| adn,n, Table 11.10 Variation of a (interpo- lated values based on Terzaghi, Peck and Mesri, 1996) LJB, = 1 8 Cu 7 Pa < 0.1 0.2 1.00 6 0.92 0.3 0.82 0.4 0.74 0.6 0.62 4 T 0.8 0.54 3 4 5 1.0 0.48
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 friction
The section of a 3 x 4 group pile in a layered saturated clay is shown in the figure below. The piles are square in cross section (356 mm x 356 mm). The center-to-center spacing, d, of the piles is 889 mm. Determine the allowable load-bearing capacity of the pile group. Use FS = 4. Note that the groundwater table coincides with the ground surface.
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/m³
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 5m
A concrete pile 20 m long with a cross section of 400 mm x 400 mm is fully embedded in a saturated clay layer. The clay has the following properties: γsat = 18.5 kN/m3, ϕ= 0 and cu = 70 kPa. Assume that the water table rises to the tip of the pile. Determine the allowable load that the pile can carry (FS=3). Use the α and λ method to estimate the skin resistance.
A 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 XXXX
3. Consider a soil profile as shown in Figure Q3. Note that the ground water table is situated at 10 m below the ground surface. Assume piles settle sufficiently so that soil strengths are fully mobilized. Use L' = 15D where necessary. a) Determine the allowable load that can be supported by a 25 m long concrete bored pile with a diameter of 1200 mm.
5. A concrete pile is 20 m long has a cross section of 0.46 m × 0.46 m. The pile is embedded in a sand having y=17 kN/m³ and Ø= 38°. The allowable working load is 1200 kN. If 700 kN are contributed by frictional resistance and 500 kN are from the point load, determine the elastic settlement of the pile. Given: Ep = 21×106 kN/m², Es = 30×10³ kN/m², µs=0.38 and = 0.57.