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The group efficiency of a pile group
  • a)
    will be always less than 100%
  • b)
    will be always greater than 100%
  • c)
    may be less than 100% or more than 100% depending upon other factors
  • d)
    is more than 100% in cohesionless soil and less than 100% in cohesive soil
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
The group efficiency of a pile groupa)will be always less than 100%b)w...
Group Efficiency is defined as the ratio ultimate bearing capacity of a pile group to the sum of the ultimate load capacity of individual piles

For sandy soil: η > 1.0
This is because the soils get densified due to the driving of piles in sandy soil and hence soil strength properties increase.
For clayey soil: η < 1.0
This is because the pressure bulbs of individual piles overlap the pressure bulb of each other resulting in a reduction of pile group carrying capacity.
∴ Pile group efficiency will be more than 100% for pile group in cohesionless soil and less than 100% for those in cohesive soils.
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The group efficiency of a pile groupa)will be always less than 100%b)will be always greater than 100%c)may be less than 100% or more than 100% depending upon other factorsd)is more than 100% in cohesionless soil and less than 100% in cohesive soilCorrect answer is option 'D'. Can you explain this answer?
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