A 4 x 4 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/m², 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 (s) of the piles (in m) would be __________ (round off to two decimal places).

GATE 2025 Civil Engineering Q57 — Civil Engineering

GATE 2025Set 2Q57NATanswer keyexplanation soonmedium

Civil Engineering · Geotechnical Engineering - Pile Foundations

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Figure from the original GATE 2025 paper. (IIT Roorkee archive)

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Geotechnical Engineering - Pile Foundations has appeared in GATE Civil Engineering 13 times across 7 years (2022, 2023, 2024, 2025, 2026, ...).

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pile foundationgroup pileclayey soilgeotechnical engineering