GATE CE 2025 Set 2 — Question 57
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Geotechnical Engineering → Deep Foundations → Pile Capacity in Clays
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Question
A group pile, with each pile 20 m long and 500 mm in diameter, is installed in a square pattern in a clayey soil, as shown in the figure. The average unconfined compressive strength of the soil is 100 kN/m, and the adhesion factor is 0.8. Neglect the bearing at the tip of the piles. For a group efficiency factor of 1.0, the centre to centre spacing () of the piles (in m) would be ________ (round off to two decimal places).
Correct answer
1.5 to 1.52
Solution
For a pile group in clay, the ultimate capacity is the minimum of the sum of individual capacities and the block capacity. Given group efficiency , we have:Individual pile capacity (neglecting tip bearing):Total capacity of 16 piles:Block capacity:Equating the two:Rounding to two decimal places, m.
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