Principles of Foundation Engineering (MindTap Course List)
Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN: 9781305081550
Author: Braja M. Das
Publisher: Cengage Learning
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Chapter 9, Problem 9.28P
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Find the allowable load-carrying capacity of the pile group.

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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
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
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