Estimate the pile length required to carry the 670 kN axial load for the pile-soil system shown in the figure below. The 460-mm pipe is to be filled with concrete after driving. Safety factor = 3.0 L-Method. diameter 42- 670 kN Soft clay - c=30 kPa 7= 18.5 kN/m³ Medium stiff clay c = 55 kPa y=19.81 kN/m³ 460 mm J L₂ .22. factor 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 35 50 as 100 E Pu = Pp + Σ Psi, u 150 200 250 300 kPa cohesion Cas

Estimate the pile length required to carry the 670 kN axial load for the pile-soil system shown in the figure below. The 460-mm pipe is to be filled with concrete after driving. Safety factor = 3.0 L-Method. diameter 42- 670 kN Soft clay - c=30 kPa 7= 18.5 kN/m³ Medium stiff clay c = 55 kPa y=19.81 kN/m³ 460 mm J L₂ .22. factor 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 35 50 as 100 E Pu = Pp + Σ Psi, u 150 200 250 300 kPa cohesion Cas

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter12: Pile Foundations

Section: Chapter Questions

Problem 12.8P: Consider a 500 mm diameter pile having a length of 18 m in a clay. Given: γ = 20.0 kN/m3 and cu = 60...

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Solve Problem 12.23 using the method of Broms. Assume that the pile is flexible and free headed. Let the soil unit weight, = 16 kN/m3; the soil friction angle, = 30; and the yield stress of the pile material. FY = 21 MN/m2. 12.23 A 30 m long concrete pile is 305 mm 305 mm in cross section and is fully embedded in a sand dcposit. If nh = 9200 kN/m2, the moment at ground level Mg = 0, the allowable displacement of pile head = 12 mm; Ep = 21 106 kN/m2, and FY(pile) = 21,000 kN/m2, calculate the allowable lateral load, Qg, at the ground level. Use the elastic solution method.
A driven closed-ended pile, circular in cross section, is shown in Figure P12.7. Calculate the following. The ultimate point load using Meyerhof’s procedure. The ultimate point load using Vesic’s procedure. Take Irr = 50. An approximate ultimate point load on the basis of parts (a) and (b). The ultimate frictional resistance Qs. [Use Eqs. (12.42) through (12.44), and take K = 1.4 and δ′ = 0.6ϕ′.] The allowable load of the pile (use FS = 4).
A concrete pile 16 in. 16 in. in cross section is shown in Figure P12.13. Calculate the ultimate skin friction resistance by using the a. method [use Eq. (12.61) and Table 12.11] b. method c. method Use R=20 for all clays, which are normally consolidated.
A concerete pile 15.24m long having cross section 406 mmx406mm...saturated clay layer 19.02kn.. dtermine the allowable laod ...use the a method
A concrete pile 458 mm by 458 mm square cross section is embedded in a saturated clay. The length ofthe embedment is 16 m. The undrained cohesion, Cu of clay is 60 kN/m2, and the unit weight of clay is 19 kN/m2• Use a factor of safety of 4 to determine the allowable load the pile can carry.
Calculate the pile's allowable bearing load using the corrected SPT values at various depths given in the figure below (factor of safety is 1.5). 10m D=1m 2m 2m 2m 2m 2m SPT1=14. SPT2=16 SPT3=18. SPT4=18 -- SPT5=20. Corrected SPT Values
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Determine load carrying capacity of pile without considering critical depth concept. Diameter of pile 0.4 m.Ng =132 for o = 40° to m y 4.b Cot-opf "loose Sand K=1 = 21-15 From. 8a 19 Cu 20k Demse Sund 2 20 $=40° K=2 -I 30°
FDE 014: The pile group shown consists of 12 piles, each 0.36m in diameter arranged 3 x 4 matrix. The pile penetrates a soft clay (L₁ = 3m, Cu1 = 56kPa), a medium dense clay (L2 = 5m, cu2 = 78kPa), and a stiff clay (L3= 4m, Cu3 - 95kPa). Assume Nc-9 and use á- 1 for soft and medium dense clay, á-0.5 for stiff clay. FS = 3. 1⁹ 0.8m 0.8m 0.3m Compute the safe center-to-center spacing of the piles for 100% efficiency. Select the correct response: 175 mm 251 mm 197 mm 138 mm 0.8 m 3.8
A rectangular pile (0.85 x 0.77) is driven in clayey soil arrangement composed of two different layers. First laye has a height of 9 m., cohesion of 59 kPA, friction factor of 0.84. Second Layer has a height of 5m., cohesion of 74 kPa, and friction factor of 0.87. Compute the allowable load that the pile can carry if the factor safety is 2.37. Use stored value. Answer to 5 decimal places.
Check the total settlement of a group of pile as shown in Figure 1. The total allowable settlement is set not exceed 3% of the pile diameter and the overconsolidated ratio (OCR) of the clay is more than 1. The groundwater table is located 15m beneath the ground level. The diameter of the pile, b is 0.5m and the spacing between piles, s is 2m.The pile group is subjected to foundation load of 5425KN. The laboratory testing data for the soil samples taken are as follows: At 5m, eo = 0.55, Cc = 0.32, C; = 0.09, ơ'o = 150kN/m? At 10m, eo = 0.55, Cc = 0.32, Cs = 0.09, o'o = 225KN/m? At 12m, eo = 0.55, Cc = 0.32, Cs = 0.09, o'o = 300KN/m? 7m 5m Clay 3 10m Unit weight = 18KN/m Friction angle = 0 degree 2 Cohesion = 100KN/m Figure 1: Pile system
Check the total settlement of a group of pile as shown in Figure 1. The total allowable settlement is set not exceed 3% of the pile diameter and the overconsolidated ratio (OCR) of the clay is more than 1. The groundwater table is located 15m beneath the ground level. The diameter of the pile, b is 0.5m and the spacing between piles, s is 2m.The pile group is subjected to foundation load of 5425kN. The laboratory testing data for the soil samples taken are as follows: At 5m, eo = 0.55, Cc = 0.32, C; = 0.09, o'o = 150kN/m? At 10m, eo = 0.55, Cc = 0.32, Cs = 0.09, o'o = 225kN/m2 %3D At 12m, eo = 0.55, Cc = 0.32, C; = 0.09, o'o = 300KN/m2 %3D 7m 5m Clay 3 10m Unit weight = 18KN/m %3D Friction angle = 0 degree 2 Cohesion = 100KN/m