Practice Summary Of Key Points (4) - Driving Stresses in Piles - Construction Engineering & Management - Vol 2

Practice: Summary of Key Points

Lesson 4Driving Stresses in Piles

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10 questions

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6 sample questions

Question 1.
What is the primary purpose of cushioning material in pile driving?
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Think about what happens when two hard objects collide.
Question 2.
What should be the minimum thickness of a cushioning material?
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Recall the figures discussed for effective cushioning.
3Question 3.
What is the main purpose of cushioning materials in pile installation?
- To hold the pile upright
- To protect the pile from impact
- To speed up the installation
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Think about what happens during the driving process.
4Question 4.
True or False: The impact velocity of the hammer should be increased to reduce driving stress.
- True
- False
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Consider the relationship between velocity and impact.
Question 5.
Calculate the appropriate hammer weight needed for a pile weighing 720 pounds if the minimum recommending ratio is 1:3 for the hammer.
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Think about dividing the pile weight by the ratio.
Question 6.
If a hammer produces 2000 foot-pounds of energy while driving and encounters 20 pounds of soil resistance, how deep does the pile penetrate according to the formula W.H = R.S?
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Work backwards from the given energy and resistance.

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