GATE CE 2026 Set 1 — Question 58
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Geotechnical Engineering → Deep Foundations → Friction Piles
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Question
A group of 25 circular piles is arranged in uniform pattern in a soft clay soil with equal spacing in both the directions. These are friction piles with negligible end bearing.Consider the following details:Diameter of each pile = 1 m
Length of each pile = 15 m
Cohesion of the soil =
Unit weight of the soil =
Adhesion factor = 0.75Considering the efficiency of the pile group as unity, the optimum value of the ratio of the pile spacing to pile diameter is __________________ (rounded off to one decimal place).
Length of each pile = 15 m
Cohesion of the soil =
Unit weight of the soil =
Adhesion factor = 0.75Considering the efficiency of the pile group as unity, the optimum value of the ratio of the pile spacing to pile diameter is __________________ (rounded off to one decimal place).
Correct answer
3.2 to 3.6
Solution
Efficiency of the pile group implies that the group capacity is equal to the sum of individual pile capacities .
1.Individual Pile Capacity ():
Since end bearing is negligible:2.Total Individual Capacity for 25 piles:
3.Group Capacity as a Block ():
For a square group of piles, the width of the block is:4.Equating for :
5.Ratio of spacing to diameter ():
Ratio Rounding to one decimal place, the value is 3.4.Continue learning with Success Tracker
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