GATE CE 2018 Set 1 — Question 41
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Geotechnical Engineering → Deep Foundations → Pile Capacity in Clays
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Question
A square concrete pile is to be driven in a homogeneous clayey soil having undrained shear strength, and unit weight, . The design capacity of the pile is . The adhesion factor is given as . The length of the pile required for the above design load with a factor of safety of is
Correct answer
(C) 11.8 m
Solution
The ultimate load capacity () of the pile is calculated as:
For a pile in clay, the ultimate capacity is the sum of base resistance () and skin friction ():
Where:
Rounding to the nearest option, .
For a pile in clay, the ultimate capacity is the sum of base resistance () and skin friction ():
Where:
- (standard for deep foundations in clay)
Rounding to the nearest option, .
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