GATE CE 2018 Set 2 — Question 55
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Geotechnical Engineering → Deep Foundations → Negative Skin Friction
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Question
A group of nine piles in a square pattern is embedded in a soil strata comprising dense sand underlying recently filled clay layer, as shown in the figure. The perimeter of an individual pile is 126 cm. The size of pile group is 240 cm 240 cm. The recently filled clay has undrained shear strength of 15 kPa and unit weight of 16 kN/m.
The negative frictional load (in kN, up to two decimal places) acting on the pile group is ______
Correct answer
472 to 472.5
Solution
Negative skin friction for a pile group is the maximum of individual action and block action.
Where and
Negative frictional load = .
1.Individual action ():
2.Block action ():
Where and
Negative frictional load = .
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