--Pile in Sand (friction and end bearing) Make calculations to determine theAllowable Load for a 14-inch square precast concrete pile that is driven into a dense medium tofine sand deposit with = 36 deg. and y = 125 pcf. The pile is driven to 85 ft. depth, and thereis still 40 ft. of sand below the pile tip. Groundwater is 6 ft. below ground surface. You are toassume that a static pile load test will be performed on one representative pile for this project.Use the limiting depth and limiting pressure approaches for end bearing and for side friction.State the K and 8 values you use, and justify.

The image specifically shows a precast concrete pile driven into sand.The text in the image…

Answered: -- Pile in Sand (friction and end…

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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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 400 mm 400 mm square precast concrete pile of 15 m length is driven into a sand where = 18.0 kN/m3 and = 33. Assuming = 0.7 and K = 1.4Ko, determine the load carrying capacity of the pile with factor of safety of 3.0.
Redo Problem 18.10 using the method for estimating the skin resistance. 18.10 A concrete pile 15 m long with a cross section of 380 mm 380 mm is fully embedded in a saturated clay layer. For the clay, sat = 18 kN/m3, = 0, and cu = 80 kN/m2. Assume that the water table lies below the tip of the pile. Determine the allowable load that the pile can carry (FS = 3). Use the a method to estimate the skin resistance.
A 400-mm diameter and 15 m long concrete pile is driven into a sand where = 18.0 kN/m3 and = 31. Assuming = 0.65 and K = 1.4 Ko, determine the load carrying capacity of the pile with a factor of safety of 3.
A 500 mm diameter and 20 m long concrete pile is driven into a sand where = 18.5 kN/m3 and = 32. Assuming = 0.7 and K = 1.5 Ko, determine the load carrying capacity of the pile with a factor of safety of 3.
Determine the maximum load that can be allowed on a 500 mm diameter and 18 m long pile driven into a clay where = 20.0 kN/m3 and cu = 60 kN/m2. Use the a method for determining the skin friction. Allow a factor of safety of 3. What percentage of the ultimate load is being carried by the pile shaft?
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).
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).
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?
A circular concrete pile 350 mm in diameter is to support a load of 270kN.Itis driven in a stiff clay (α = 0.50). The unconfined compressive strength of clay is 170 kPa. Assume a factor of safety of 2.50 and Nc = 9. Determine the end bearing capacity of the pile. Determine the developed skin friction along the surface of the pole. Determine the minimum length of the pile that can carry the given load
C- Determine the base capacity of a square pile with a 0.4 m width and a 10 m length using Hansen's approach in the following two scenarios (a) With gamma = 16.7kN / (m 3), the water table is much below the pile base. (b) The water table is at the surface of the ground and gamma sat is equal to 20 kN/m3. Ignore the phrase N_Y. c'=0 phi'=40 degrees
A concrete pile 450 mm in diameter and 15 m long is driven into a clay soil. The undrained strength “su”of the soil is 39.55 kPa. Calculate the allowable pile load capacity using “α” (Alpha) method. The factor of safety required is 2 and γsat = 18 kN/m3. Groundwater table is at the ground surface.

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