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 14.4P
To determine
Find the settlement.
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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
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3
3.5B
b
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9.
10
11
a
3.5B
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1.5B
1.5B
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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
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 ?
Chapter 14 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- Example (3): A site consist of two layers of clay. The upper layer is 8m- thick and has an undrained shear strength of 80 kN/m². The lower layer is a thick layer which has an undrained shear strength of 120 kN/m². Assume • Top 1m of pile doesn't support load. • FS 1.5 and FS₁=3 = (A) Estimate the working load of the pie with the following: D=1.5m, Ds=4.5 m, L=27m Bell length is 3m. (B)Determine the length of 600mm- diameter of driven pile to support a working load of 1200 kN.arrow_forwardA 30 cm diameter pile is driven 10 m deep into a homogeneous consolidated clay deposit. The safe load carrying capacity (in kN) against the factor of safety of 2.5. Take unit cohesion of clay as 40 kN/m² and adhesion factor as 0.7. A 150.8 B 105.6 C 215.4 D 115.7arrow_forward3. Consider a soil profile as shown in Figure Q3. Note that the ground water table is situated at 10 m below the ground surface. Assume piles settle sufficiently so that soil strengths are fully mobilized. Use L' = 15D where necessary. a) Determine the allowable load that can be supported by a 25 m long concrete bored pile with a diameter of 1200 mm.arrow_forward
- The section of a 4 x 4 group pile in a layered saturated clay is shown in Figure P 9.29. The piles are square in cross section (356 mm x 356 mm). The center-to-center spacing (d) of the piles is 1 m. Determine the allowable load bearing capacity of the pile group. Use FS = 3 and Table 9.10.arrow_forward3. A concrete pile 15.24 m long having a cross section of 406 mm × 406 mm is fully embedded in a saturated clay layer for which Ysat 19.02 kN/m³, Ø = 0, and cu=76.7 kN/m². Determine the allowable load that the pile can carry (Assuming FS-3). Use the a method to estimate the skin friction and Vesic's method for point load estimation.arrow_forwardSquare concrete piles are arranged in 5 row by 5 column formation beneath the pile cap. These piles are embedded into several layers of cohesive soil. The first layer is 3.75m deep and the second layer is 4.49m deep. The total depth of the third layer was not fully captured in the geotechnical report and is assumed to extend indefinitely. The piles are 0.60m wide. Each pile span 12.59m in length. The first layer has c = 61 kPa and α = 0.99. The second layer has c = 82 kPa and α = 0.78. The third layer has c = 81 kPa and α = 0.63. The bearing capacity factor Nc is equal to 8.What should be the spacing (m) to get a group efficiency of 111%? Consider ultimate capacities. Please answer this asap. For upvote. Thanksarrow_forward
- A pile of diameter 0.4 m is fully embedded in a clay stratum having 5 layers, each 5 m thick as shown in the figure below. Assume a constant unit weight of soil as 18 kN/m³ for all the layers. Using method (= 0.15 for 25 m embedment length) and neglecting the end bearing component, the ultimate pile capacity (in kN) is G Y=18kN/m³- for all layers 7XXX 5m 5m 5m 5m 5m = 25 m 0.4m, c=40 kPa c=50 kPa c=60 kPa c=70 kPa c=80 kPa S XXXXarrow_forwardFigure 1 shows a cross-section through an excavation in a deep sand deposit. The site engineer determined that the exaction is too deep for a cantilever sheet pile to perform as an economical option and recommended to prop a smaller thickness sheet pile wall by using wooden struts that are spaced 3 m along the length of the wall. You are the office design engineer and are given the sketch below and asked to determine the following: i. 11. 111. The distribution of the lateral pressure over the wall height. The total force that the retaining wall must resist. The loads (in kN) carried by the individual upper and lower props. 1.5 m Props 1.5 m q=12 kPa ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ Sand y=17.5 kN/m² # = 34° Figure 1 ▼ Sand sat = 19.5 kN/m² # = 34° 3.0 m 7.0 marrow_forwardRedo Problem 9.23 assuming that the water table coincides with the top of the fill and that γsat(fill) = 19.8 kN/m3. If the other quantities remain the same, what would be the downward drag force on the pile? Assume ẟ' = 0.5 Φ'fill.arrow_forward
- Determine the ultimate load capacity of a circular pile with diameter D = 20 cm installed in asaturated soft clay. The pile is embedded 10 m into the ground. According to measurements, thesoil exhibits an undrained shear strength according to the linear relationship: Su = 2+1.6z, wherez is the depth in meters and Su is the undrained shear strength in kPa. The soil's unit weight canbe assumed as 18 kN/m3arrow_forwardA group pile in clay is shown in the figure below. Determine the maximum vertical load Qg be applied if the allowable consolidation settlement of the pile group is set to be 0.17 m. Use the 2:1 stress distribution method to estimate the average effective stress in the clay layer. can Qg 3 m Sand Groundwater y = 15.72 kN/m3 table Sand 3 m Ysat = 18.55 kN/m3 2.75 m X 2.75 m Group plan Normally consolidated clay Ysat = 19.18 kN/m³ 15 m 18 m eo = 1 C. = 0,8 Normally consolidated clay Ysat = 19 kN/m3 eo = 0.25, C. =1 5 m Rockarrow_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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