5.3.1. Combining Size Distribution Curves

Try these first

1. 1.

   What is soil description?

   Hint

   Think of characteristics like color and texture.

2. 2.

   What does the effective size (D10) indicate?

   Hint

   Look at where the curve intersects.

3. 3.

   What is the primary purpose of soil classification?

   • To describe the color of the soil
   • To group soils with similar behavior
   • To determine the soil's planting capacity

   Hint

   Consider how engineers would approach differing soils.

4. 4.

   Wet sieving is primarily used for separating which size of soil?

   • True
   • False

   Hint

   Think about the sieve sizes defined in the section.

5. 5.

   Given a soil sample measuring D10 = 0.02mm and D60 = 0.3mm, calculate the uniformity coefficient, and explain what this indicates about the soil.

   Hint

   Apply the uniformity coefficient formula.

6. 6.

   A grading curve for a sample shows a high percentage of clay with low effective size. Discuss the potential engineering challenges this might pose.

   Hint

   Investigate the behaviors of clay in construction scenarios.