Q3: What is the ultimate capacity of 4x4 concrete pile group shown in figure 3. The pile diameter (d) = 14 in and the spacing between the piles is 3d. The piles are driven to a depth of 40 ft below grades through soil layers. The bottom of pile cap is 6 ft below grade. Indicate the failure mechanism (Block failure or individually)

Q3: What is the ultimate capacity of 4x4 concrete pile group shown in figure 3. The pile diameter (d) = 14 in and the spacing between the piles is 3d. The piles are driven to a depth of 40 ft below grades through soil layers. The bottom of pile cap is 6 ft below grade. Indicate the failure mechanism (Block failure or individually)

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 12.7P: A driven closed-ended pile, circular in cross section, is shown in Figure P12.7. Calculate the...

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A steel pile (H-section; HP 360 1.491; see Table 18.1) is driven into a layer of sandstone The length of the pile is 18.9 m. Following are the properties of the sandstone: Unconfined compression strength = qu(lab) = 78.7 MN/m2 Angle of friction = 36 Using a factor of safety of 3, estimate the allowable point load that can be carried by the pile. Use Eq. (18.42).
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Question- A square pile group of 9 piles having depth of 9 m passes through a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 60 cm centre to centre. If the unconfined compressive strength of the cohesive material is 60 kN/m² and unit weight is 15 kN/m³, the negative skin friction of the pile group is un kN.
The vertical static load of single pile is tested in a project, the bearing capacity of the three piles is 880KN, 860KN, 890kN respectively. According to the code of the pile foundation, the characteristic value of bearing capacity of the single pile is R. which value is closest to the R? () A 438 kN; B 498 KN; C 588 kN; D 638 KN.
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FDE 015: A group of friction piles is shown. The total load on the pile less the soil displaced by the footing is 1900 kN. Lp = 2 m, L2 - 1.8 m, L = 12 m, t = 19 m, 9u = 180 kPa, FS = 3. See figure below. Compute for the compression index of the day.
The diamter of precast round piles under pile cap is 400mm, the embedded depth of cap bottom is 1.5m, the thickness of the soft clay 1₁=8m and enter the hard plastic clay /₂=2m. Try to calculate the bearing capacity characteristic value of a single pile according to building foundation design code. Asia 5kPa soft clay hard Asia 35kPa Apa 1025kPa clay 8m 2m 1.5m
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).
Refer to the pile shown in Figure P9.1. Estimate the side resistance Qs by Using Eqs. (9.40) through (9.42). Use K = 1.5 and Coyle and Castello’s method [Eq. (9.44)]
A steel pile (H-section; HP 310 125; see Table 12.1a) is driven into a layer of sandstone. The length of the pile is 25 m. Following are the properties of the sandstone: unconfined compression strength = qu(lab) = 80 MN/m2 and angle of friction = 36. Using a factor of safety of 3, estimate the allowable point load that can be carried by the pile. Use [qu(design) = qu(lab)/5].
Consider a 500 mm diameter pile having a length of 18 m in a clay. Given: γ = 20.0 kN/m3 and cu = 60 kN/m2. Determine the maximum allowable load (Qall) with FS = 3. Use the α method and Table 12.11 for determining the skin friction and Eq. (12.20) for determining the point load. Allow a factor of safety of 3. What percentage of the ultimate load is being carried by the pile shaft? Is it a friction pile?
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.