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 14.3P
To determine
Find the stiffness of the piled raft
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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.
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Consider a group of 450 mm x 450 mm reinforced concrete piles were driven into
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A 600 mm diameter and 25 m long driven concrete pile carries a column load of 1200 kN. It is estimated that the shaft carries 900 kN and the point carries 300 kN. Determine the settlement of the pile head using the Poulos and Davis method with the following data: Es = 25 MN/m2, Ep = 30,000 MN/m2 and ?s = 0.2.
Chapter 14 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- Please do 12,21arrow_forwardExample (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_forward9.27 The plan of a group pile is shown in Figure P9.27. Assume that the piles are embedded in a saturated homogeneous clay having a c = 90 kN/m². Given: diameter of piles (D) = 316 mm, center-to-center spacing of piles = 600 mm, and length of piles = 20 m. Find the allowable load-carrying capacity of the pile group. Use Table 9.10 and FS = 3. d Figure P9.27arrow_forward
- The plan of a group pile is shown in the figure. Assume that the piles areembedded in a saturated homogeneous clay having a cu=90 kN/m2 . Given: Diameter of piles (D)=316 mm, center-to-center spacing of piles=600 mm, and length of piles= 20 m. Find the allowable load-carrying capacity of the pile group. Using FS=3 and table.arrow_forwardPlease answer 11.24arrow_forward12.10 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, p = 0, and c₂ = 76.7 kN/m². Determine the allowable load that the pile can carry. (Let FS = 3.) Use the a method Eq. (12.61) and Table 12.11 to estimate the skin friction and Vesic's method for point load estimation.arrow_forward
- SKIP IF YOU CAN;T SOLVE THE EXACT ANSWER IN THE CHOICESarrow_forwardPlease answer 11.7arrow_forwardDetermine 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_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_forwardPlease answer 11.24arrow_forwardA 400 mm x 400 mm square precast concrete pile of 15 m length is driven into a sand where γ = 18.0 kN/m3 and Φ' = 33°. Assume δ' = 0.7 and K=1.4Ko determine the load-carrying capacity of the pile with a FS=3. Using Meyerhof's method, Qp=Apq'Nq*≤Apql for computing the point load-carrying capacity Qp, Equations, L'≈15D and f=Kσ'otanδ' for computing the load-carrying capacity of the pile shaft Qs.arrow_forward
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