GATE CE 2019 Set 2 — Question 64
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Geotechnical Engineering → Deep Foundations → Dynamic Pile Formulae
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Question
A timber pile of length and diameter is driven with a drop hammer, falling freely from a height of . The total penetration of the pile in the last blows is . Use the Engineering News Record expression. Assume a factor of safety of and empirical factor (allowing reduction in the theoretical set, due to energy losses) of . The safe load carrying capacity of the pile (in , round off to 2 decimal places) is _______
Correct answer
151 to 152
Solution
The Engineering News Record (ENR) formula for the safe load carrying capacity () of a pile driven by a drop hammer is:Where:
Total penetration in the last blows = .
Average penetration per blow, .Substituting the values into the formula:Rounding off to 2 decimal places, the safe load carrying capacity is .
- = weight of the hammer =
- = height of free fall =
- = factor of safety =
- = average penetration per blow for the last few blows
- = empirical constant = (for drop hammer)
Total penetration in the last blows = .
Average penetration per blow, .Substituting the values into the formula:Rounding off to 2 decimal places, the safe load carrying capacity is .
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