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 18.22P
To determine
Find the allowable load-carrying capacity
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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.
1. A 3 X 4 group pile that are square in cross
section (356 mm x 356 mm) as shown in the
figure. The center-to-center spacing, d, of the
piles is 889 mm. If a ₁ = 0.68, a 2 = 0.51. Assume
the piles act individually. Determine the
ultimate load-bearing capacity of the pile
group.
G.W.T
4.57 m
13.72 m
Clay
"=50.3 kN/m²
Y17.6 kN/m³
Clay
C=85.1 kN/m²
Y 19.02 kN/m
T
889 mm
A group of piles as shown on the figure has a
cross section of 0.30 m x 0.30 m. It has a total
length of 15 m. The piles are embedded in a
homogeneous saturated clay with Cu = 70
kPa. Unit weight of clay is 18.8 kN/m³ and the
ground water table is located at a depth of
18 m. below the ground surface. Factor of
safety = 4. Compute the allowable load-
bearing capacity of the group of pile acting as
individual piles.
Qall
Clay
Cu70 kPa
70
15m
56 m-
LI-2.74 m
-Lz=3,96-
Ans. 2816.10 kN
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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- 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 Sand 10 m Ysat = 19.0 kN/m³ O' = 33° Figure - 1arrow_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_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
- 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 Q2arrow_forwardA nine-pile group composed of 0.30 m diameter pipe piles is embedded 15 m in clay soil with conditions indicated by the sketch. 1. Det the total capacity if piles act individually 2. Find the total capacity if piles act as a group 3. Det the design load if factor of safety is 3. C = 42.81 kpa a = 0.85 6m C = 57.46 kpa a = 0.75 6m C = 95.76 kpa a = 0.5 Nc = 8 3m 0.75m 1-8 0.75m 上tt 0.75m 0.75marrow_forwardi need the answer quicklyarrow_forward
- For the (4 x 4) pile group as shown in the figure, the settlement of pile group, in a normally consolidated clay stratum having properties as shown in the figure will be (Load dispersion = 2 H:1 V) mm. 900 kN G Normally consolidated clay Yat = 20 kN/m 6 m w̟ = 40% 8 m w, = 25% e, = 1.05 Hard stratum 250 mm Piles are spaced at 0.5 m c/c. Diameter of piles is 250 mm 0.5 m 0.5 m Top viewarrow_forwardi need the answer quicklyarrow_forwardQUESTION 5 Calculate the load bearing capacity of the pile shown in Figure Q5. Assume that it is a bored pile, and state other assumptions made. 0.6 m Firm Clay Y. = 18KN/m2 = 40 kPa 3m Stiff Clay Y, = 19kN/m³ Cu = 110 kPa 2.5m WT 13m Dense Gravel Y. = 21kN/m² o' = 37° 15m Figure Q5arrow_forward
- 2. For the group of piles shown in Figure 2, determine the safe length of piles.arrow_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 group of piles are arranged as shown in the figure. The piles are square in section with sides equal to 400 mm and has a spacing of 1.80 m on centers. One pile has a total length of 18 m. Unit weight of clay is 19.7 kN/m3 and has a cohesion of 90 kPa. Ground water table is located at depth of 20 m below the ground surface. Adhesion factor is 0.90. Determine the ultimate load – bearing capacity of the group of piles considering the piles acting individually.arrow_forward
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