GATE CE 2025 Set 1 — Question 58
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Geotechnical Engineering → Deep Foundations → Pile Capacity in Clays
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Question
A single pile with 450 mm diameter has been driven into a homogeneous clay layer, which has an undrained cohesion () of 20 kPa and unit weight of 18 kN/m. The ground water table is found to be at the surface of the clay layer. The adhesion factor () of the soil is 0.95 and bearing capacity factor () is 9. The pile is supporting a column load of 144 kN with a factor of safety of 3.0 against ultimate axial pile capacity in compression.The required embedment depth of the pile (in m) is ________________ (rounded off to the nearest integer).
Correct answer
15 to 16
Solution
1.Calculate the ultimate axial pile capacity ():
Given column load kN and Factor of Safety .2.Calculate the base resistance ():
Where 3.Calculate the required skin friction resistance ():
4.Determine the embedment depth ():
Rounding to the nearest integer, the required embedment depth is 15 m.Continue learning with Success Tracker
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