Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 14, Problem 14.5P
To determine
Find the total load on pile raft
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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
2. For the group of piles shown in Figure 2, determine the safe length of piles.
Chapter 14 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- Figure P12.36 shows a 3 5 pile group consisting of 15 concrete piles of 400 mm diameter and 12 m in length. What would be the maximum load that can be allowed on the mat with a factor of safety of 3? The piles have a center-to-center spacing of 1200 mm.arrow_forwardi need the answer quicklyarrow_forwardQ2: The plan of a group piles is shown below. Assume that the piles are embedded in a saturated homogeneous clay having a 7sa= 19.24 kN/m, C=41.2 kN/m? .Given: diameter of piles (D) = 305 mm, center-to-center spacing of piles 762 mm, and length of piles = 13.7 m. Find the allowable load-carrying capacity of the pile group. Use FS = 3. Parrow_forward
- In a 16 (4 x4) piles group, the pile diameter is 0.4 m and center to center spacing of piles in the square group is 1.5 m. If C. = 50 kN/m², with neglecting the bearing at the tip of the pile, determine whether the failure would occur as block failure or when the piles act individually. The piles are 12 m long. Take α= 0.7 for shear mobilization around each pile. Also determine the safe load on this group assuming the factor of safety -2.5.arrow_forwardSolve correctlyarrow_forwardDesign a reinforced concrete footing supported on piles. The column is 600 mm square and exerts a factored load of 800 kN on the footing. The allowable bearing capacity of each pile is 95 kN. Use f = 28 MPa, fy = 414 MPa. The arrangement of piles is shown in the figure. 450 850 850 450 450 850 + 850 ++ 450arrow_forward
- Note: If your answer other than given options please leave it question.arrow_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_forwardQuestion 3 A nine-pile group arranged in a square pattern is used as a foundation for a column in sand. Piles are 300 mm in diameter and placed at a spacing of 900 mm in each direction. What will be the settlement of pile group, if the settlement of single pile is 5 mm ?arrow_forward
- The pile group shown consists of 12 friction piles each 0.3 m diameter. Each pile is driven clay layer with different unconfined compressive strength. Unit weight of the clayey soil is 18.18 KN/m^3. Bearing capacity factor Nc = 9. Factor of safety is 3.0.1. Compute the allowable load of the pile group considering that the piles act individually. a. 2650 kNb. 2370 kNc. 2460 kNd. 3360 kN2. Compute the allowable load of the pile group based on block failure. a. 2650 kNb. 2370 kNc. 2460 kNd. 3360 kN3. Compute the maximum center- to- center spacing of piles to achieve 100% efficiency. *a. 627 mmb. 860 mmc. 800 mmd. 560 mmarrow_forwardA 400 mm diameter, 10 m long piles are used as foundation for a column in uniform deposit of clay (cu = 600 kN/m2). The spacing between pile is 300 mm. There are 9 piles in the group arranged in a square pattern. Determine the group efficiency assuming adhesion factor 0.4arrow_forwardIn Hiley’s formula for driven piles i.e. R=E/(s+0.5c), why is a coefficient of 0.5 applied for the term elastic deformation of piles and soil?arrow_forward
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