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.
Design 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
++
450
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_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_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_forward
- Question 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_forward5. a. Why do we sometimes need pile foundations for a substructure? b. Discuss the various installations methods for piles in caving and/or squeezing soils in deep foundations. c. A concrete pile is 15m long and has 406 mm diameter circular cross section. The pile is fully embedded in sand, for which the unit weight y =18 kN/m³ and the frictional angle o = 30°. Calculate the ultimate point load Qp. i. ii. Determine the total frictional resistance Qs. iii. Determine the total ultimate load of the pile. A concrete pile 500 mm by 500 mm square cross section is embedded in a saturated clay. The length of the embedment is 16m. The undrained cohesion, Cu of clay is 40 kN/m?, and the unit weight of the clay is 20 kN/m². Use a factor of safety of 5 to determine the allowable load the pile can carry. d.arrow_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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