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 18.19P
To determine
Find the capacity
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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 driven closed-ended pile, circular in cross section, is shown in Figure 1. Calculate the following.
a. The ultimate point load using Meyerhof’s procedure.
b. The ultimate point load using Vesic’s procedure. Take Irr = 50.
P-2 A driven closed-ended pile, circular in cross
section, is shown in the Figure. Calculate the
following:
Layer I
Groundwater
3 m
táble
a. The ultimate point load using Meyerhof's
procedure.
3 m
Layer II
b. The ultimate frictional resistance Qs.
[Take K = 1.4 and ô'= 0.6º']
c. The allowable load of the pile (use FS = 3
15 m
Layer II
d. Calculate the (a), (b) and (c) if the layer III was a
Clay soil with C,=80 kPa (use ca-method by Terzaghi
and FS = 3)
%3D
Layer I
Y = 15.7 kN/m³
4' = 32°
Layer II
= 18.2 kN/m3 Ysat = 19.2 kN/m³
Layer III
381 mm
Ysat
4' = 32°
c' = 0
= 40°
c' = 0
c' = 0
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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- 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_forwardA 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.arrow_forwardFind the maximum pile capacity for the pile group shown in figure below. If My = 500 kN.m and V = 7200 kN. 'My X=1.4 - x=1.4- y=1.2 y=1.2arrow_forward
- H.Q 10 A concrete pile 20 m long having a cross section of 0.46 m x 0.46 m is fully embedded in a saturated clay layer. For the clay, given: Ysat = 18 kN/m3,0= 0, and cu = 80 kN/m2. Determine the allowable load that the pile can carry (FS = 3). Use the method to estimate the skin resistance.arrow_forwardThe 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.arrow_forwardd and e onlyarrow_forward
- i need the answer quicklyarrow_forwardThe 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 0.48arrow_forwardA 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_forward
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