EBK PRINCIPLES OF FOUNDATION ENGINEERIN
8th Edition
ISBN: 8220100547058
Author: Das
Publisher: CENGAGE L
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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 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.
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.
Chapter 9 Solutions
EBK PRINCIPLES OF FOUNDATION ENGINEERIN
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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- 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_forward12.10 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_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
- 3. 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_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_forwardQ1: Determine the allowable load capacity for the driven pile of 0.6 m diameter embedded in a layered soil as shown in the figure below, use F.S 2.0 , K, = 1.5 and tand =0.5? ELEV. 110 N.C.C W.T ELEV. 108 Cu =70 kPa Y = 17 kN/m3 a = 1, yw = 10 kN/m? ELEV. 102 O.C.C, Cu 180 kPa, y = 20 kN/m³ a = 0.45 ELEV. 98 Sandy Layer Yt = 19 kN/m3 Ø = 32° Nq = 23.18 ELEV. 90arrow_forward
- 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_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_forwardFigure 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/m²arrow_forward
- Steps Consider a precast concrete pile that is 0.505 m X 0.505 m in cross section driven in a homogeneous sand with y = 17 kN/m² and friction angle $ = 33ª . The pile is 9 m long. Use Meyerhof's methods for estimating the frictional resistance Qs in Sand. Show all calculation steps. Depth below ground surface (m) 1.5 3.0 4.5 6.0 7.5 9.0 10.5 12.0 13.5 15.0 16.5 18.0 19.5 21.0 Noo 8 10 9 12 14 18 17 20 28 29 32 30 27arrow_forwardA driven closed-ended pile, circular in cross section, is shown in Figure P 9.4.Calculate the following.a. The ultimate point load using Meyerhof’s procedure.b. The ultimate point load using Vesic’s procedure. Take Irr = 50.c. An approximate ultimate point load on the basis of parts (a) and (b).d. The ultimate frictional resistance Qs. [Use Eqs. (9.40 (L' ≈ 15 D)) through (9.42), and take K = 1.4 and ẟ' = 0.6 Φ'.]e. The allowable load of the pile (use FS = 4).arrow_forwardQ1/ For the footing shown in Figure (1), estimate the pile group capacity. 0.6m dia bored pile Clay c=80 kN/m² y-17kN/m² S=1.5 m T L=12 marrow_forward
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