GATE CE 2015 Set 2 — Question 49
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Geotechnical Engineering → Deep Foundations → Pile Capacity in Clays
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Question
A pile of diameter is fully embedded in a clay stratum having 5 layers, each thick as shown in the figure below. Assume a constant unit weight of soil as for all the layers. Using -method ( for embedment length) and neglecting the end bearing component, the ultimate pile capacity (in kN) is __________.
Correct answer
1620 to 1630
Solution
The ultimate pile capacity is the sum of skin friction and end bearing . Neglecting end bearing, .According to the -method:
Where:
The value lies within the range 1620.0 to 1630.0.
Where:
- (given for length)
- is the average effective vertical stress over the embedment length.
- is the average undrained shear strength over the embedment length.
- is the surface area of the pile.
2.Calculate Average Cohesion ():
3.Calculate Average Vertical Stress ():
Since is constant:4.Calculate :
The value lies within the range 1620.0 to 1630.0.
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