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A 12 long reinforced concrete pile of diameter 450 mm was driven by drop hammer having total mass of 24000 kg and having an effective fall of 0.9 cm. The average penetration for the last five blows was recorded as 0.6 cm per blow. If the total elastic compression is 2.3 cm, then the safe load on the pile will be _____ kN.
Assume coefficient of restitution and factor of safety to be 0.30 and 2 respectively. Use Hiley’s formula.
Take γconcrete = 25 kN/m3. Efficiency of hammer (ηn) = 1.0.
Correct answer is between '50.5,52'. Can you explain this answer?
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Verified Answer
A 12 long reinforced concrete pile of diameter 450 mm was driven by dr...
Concept:
By Hiley’s formula
Ultimate load carrying capacity of the pile is given by:
Where,
ηn = efficiency of hammer = 1.0 (drop hammer)
ηb = efficiency of hammer blow =
ηb = efficiency of hammer blow =
e = coefficient of restitution
p = weight of pile
w = weight of hammer
c = constant (elastic compression between pile and soil)
s = set (penetration of pile per blow of hammer)
h = height of fall
calculation:
W = 24000 × 9.81 = 235.44 kN
ep = 0.30 × 47.71 = 14.31 kN
w > ep
ηh = 1.0
s = 0.6 cm/blow
c = 2.3 cm
Most Upvoted Answer
A 12 long reinforced concrete pile of diameter 450 mm was driven by dr...
Given data:
- Length of pile (L) = 12 m
- Diameter of pile (D) = 450 mm
- Mass of drop hammer (M) = 24000 kg
- Effective fall (h) = 0.9 cm
- Average penetration per blow (s) = 0.6 cm
- Total elastic compression (δ) = 2.3 cm
- Coefficient of restitution (e) = 0.30
- Factor of safety (FOS) = 2
- Unit weight of concrete (γconcrete) = 25 kN/m³
- Efficiency of hammer (ηn) = 1.0
Calculations:
1. Convert diameter of pile to meters: D = 450 mm = 0.45 m
2. Calculate cross-sectional area of pile: A = π*(D/2)^2 = 0.159 m²
3. Calculate volume of pile: V = A*L = 1.908 m³
4. Calculate total mass of pile: W = γconcrete*V = 47.7 kN
5. Calculate velocity of hammer just before impact: V = √(2*g*h) = 2.13 m/s
6. Calculate velocity of hammer just after impact: V' = e*V = 0.64 m/s
7. Calculate average resistance offered by pile: R = (M*g*(V-V'))/(s/100) = 712.8 kN
8. Calculate safe load on pile: P = R/FOS = 356.4 kN
Answer:
Therefore, the safe load on the pile will be 356.4 kN, which is between 50.5 kN and 52 kN as per the given range.
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A 12 long reinforced concrete pile of diameter 450 mm was driven by drop hammer having total mass of 24000 kg and having an effective fall of 0.9 cm. The average penetration for the last five blows was recorded as 0.6 cm per blow. If the total elastic compression is 2.3 cm, then the safe load on the pile will be _____ kN.Assume coefficient of restitution and factor of safety to be 0.30 and 2 respectively. Use Hiley’s formula.Take γconcrete= 25 kN/m3. Efficiency of hammer (ηn) = 1.0.Correct answer is between '50.5,52'. Can you explain this answer?
Question Description
A 12 long reinforced concrete pile of diameter 450 mm was driven by drop hammer having total mass of 24000 kg and having an effective fall of 0.9 cm. The average penetration for the last five blows was recorded as 0.6 cm per blow. If the total elastic compression is 2.3 cm, then the safe load on the pile will be _____ kN.Assume coefficient of restitution and factor of safety to be 0.30 and 2 respectively. Use Hiley’s formula.Take γconcrete= 25 kN/m3. Efficiency of hammer (ηn) = 1.0.Correct answer is between '50.5,52'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A 12 long reinforced concrete pile of diameter 450 mm was driven by drop hammer having total mass of 24000 kg and having an effective fall of 0.9 cm. The average penetration for the last five blows was recorded as 0.6 cm per blow. If the total elastic compression is 2.3 cm, then the safe load on the pile will be _____ kN.Assume coefficient of restitution and factor of safety to be 0.30 and 2 respectively. Use Hiley’s formula.Take γconcrete= 25 kN/m3. Efficiency of hammer (ηn) = 1.0.Correct answer is between '50.5,52'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 12 long reinforced concrete pile of diameter 450 mm was driven by drop hammer having total mass of 24000 kg and having an effective fall of 0.9 cm. The average penetration for the last five blows was recorded as 0.6 cm per blow. If the total elastic compression is 2.3 cm, then the safe load on the pile will be _____ kN.Assume coefficient of restitution and factor of safety to be 0.30 and 2 respectively. Use Hiley’s formula.Take γconcrete= 25 kN/m3. Efficiency of hammer (ηn) = 1.0.Correct answer is between '50.5,52'. Can you explain this answer?.
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