4.1.2. Moist Unit Weight Calculation

Try these first

1. 1.

   Calculate the dry unit weight if the moist unit weight is 18 kN/m³ and moisture content is 0.15.

   Hint

   Use the formula γ_d = γ / (1 + w)

2. 2.

   Define the term 'unit weight' as it pertains to soil.

   Hint

   Think about how we measure weight in soil conditions.

3. 3.

   What is the formula for dry unit weight?

   • γ_d = γ/(1 + w)
   • γ_d = γ * (1 + w)
   • γ_d = γ + w

   Hint

   Remember the relationship taught in class.

4. 4.

   True or False: Saturation occurs when air fills the voids in soil.

   • True
   • False

   Hint

   Think about how water affects the voids.

5. 5.

   Given a moist unit weight of 22 kN/m³ and moisture content of 20%, calculate the dry unit weight and the amount of water needed to saturate it assuming the saturated unit weight is 25 kN/m³.

   Hint

   Start by calculating dry unit weight and then the water required.

6. 6.

   A soil's void ratio is 0.5, and specific gravity is 2.7. Calculate the dry unit weight and then the moist unit weight given a moisture content of 15%.

   Hint

   Remember the formulas and plug in values step-by-step.