Q-4: A precast concrete pile of size 50 cm x 50 cm is to be driven into clay strata whose unconfined compressive strength is 110 kN/m?. Compute the length of pile required to cary safe working load of 450 kN with factor of safety of 2.5. Assume the adhesion factor a (alpha) as 0.6.

Q-4: A precast concrete pile of size 50 cm x 50 cm is to be driven into clay strata whose unconfined compressive strength is 110 kN/m?. Compute the length of pile required to cary safe working load of 450 kN with factor of safety of 2.5. Assume the adhesion factor a (alpha) as 0.6.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter18: Pile Foundation

Section: Chapter Questions

Problem 18.14P: A steel pile (H-section; HP 360 1.491; see Table 18.1) is driven into a layer of sandstone The...

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Concept explainers

Pricing Excavation and Backfill

Backfill, in construction, is the activity of returning the soil and gravel that are removed during building construction or using them again to toughen and support the foundation of the building or any other structural component.

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Q-4: A precast concrete pile of size 50 cm x 50 cm is to be driven into clay strata whose unconfined
compressive strength is 110 kN/m?. Compute the length of pile required to carry safe working load of
450 kN with factor of safety of 2.5. Assume the adhesion factor a (alpha) as 0.6.

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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 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.
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?
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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.
Determine the maximum load that can be allowed on the 450 mm diameter pile shown in Figure 18.36, with a safety factor of 3. Use the a method for computing the shaft friction. FIG. 18.36
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