4.2. Digging the Material

Try these first

1. 1.

   What is the first step in the earthmoving process?

   Hint

   Think about making the ground easier to work with.

2. 2.

   Name one type of earthmoving equipment.

   Hint

   Consider what machinery you see on construction sites.

3. 3.

   What is the first step in the earthmoving process?

   • Hauling
   • Loosening
   • Digging

   Hint

   Think about making the ground easier to dig.

4. 4.

   True or False: Power requirements refer to the energy needed to maintain a machine's speed.

   • True
   • False

   Hint

   Focus on what power is needed for during operations.

5. 5.

   A construction project requires moving 50 tons of soil with a rolling resistance of 30 kg per ton. Calculate the total tractive effort needed. Additionally, if the machine has a power rating of 120 horsepower, determine if it can efficiently transport this load while considering general power requirements.

   Hint

   Consider both the total weight and power metrics relative to the values typical for machinery.

6. 6.

   Assume a project has different haul route conditions: 100m on hard asphalt with rolling resistance of 45 kg/ton followed by 200m on soft earth with rolling resistance of 80 kg/ton. With a machine weight of 25 tons, calculate the power needed to maintain a consistent speed across the entire distance.

   Hint

   Break the problem down by each segment to assess power requirements separately.