2.2. Hammer Energy and Work of Soil Resistance

Try these first

1. 1.

   What is driving stress?

   Hint

   Think about what happens when a pile is driven into the ground.

2. 2.

   What material is often used for cushioning piles?

   Hint

   What soft material absorbs impact?

3. 3.

   What does driving stress refer to?

   • Stress during service life
   • Stress during installation
   • Stress during manufacturing

   Hint

   Consider when the pile is most at risk.

4. 4.

   True or False: Higher hammer velocity is always the desired outcome when driving a pile.

   • True
   • False

   Hint

   Think about the relationship between velocity, energy, and potential for damage.

5. 5.

   A construction team is attempting to drive a concrete pile using a hammer weighing 200 pounds and a drop height of 3 feet. Calculate the hammer energy and evaluate the potential impact stress it could exert on the pile. Discuss how this might differ from using a lighter hammer.

   Hint

   Use the energy formula and consider the relationship with pile condition.

6. 6.

   If soil type conditions change, what adjustments should the team consider when selecting hammer and cushioning? Provide a rationale for your proposed changes.

   Hint

   Think about soil impacts on energy needs and structural support.