GATE CE 2023 Set 1 — Question 17
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Geotechnical Engineering → Deep Foundations → Friction Piles
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Question
A group of 9 friction piles are arranged in a square grid maintaining equal spacing in all directions. Each pile is of diameter 300 mm and length 7 m. Assume that the soil is cohesionless with effective friction angle . What is the center-to-center spacing of the piles (in m) for the pile group efficiency of 60%?
- A.0.582
- B.0.486
- C.0.391
- D.0.677
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Correct answer
(MTA)
Solution
The efficiency of a pile group () can be calculated using the Converse-Labarre formula:Where:
- (number of rows in a grid for 9 piles)
- (number of columns)
- (60% efficiency)
- in degrees, where is diameter and is spacing.
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