2.4. Bulk Unit Weight

Try these first

1. 1.

   What is the void ratio if the volume of voids is 0.4 m³ and the volume of solids is 0.6 m³?

   Hint

   Use the formula e = V_v / V_s.

2. 2.

   How is porosity calculated?

   Hint

   Remember to multiply by 100 to convert to a percentage.

3. 3.

   What is the formula for void ratio?

   • V_v / V_s
   • V_s / V_v
   • V_t / V_s

   Hint

   Think about how voids relate to solids in volume.

4. 4.

   True or False: Bulk unit weight is the weight of solids plus water per unit volume.

   • True
   • False

   Hint

   Recall what elements are included in bulk unit weight.

5. 5.

   Calculate the bulk unit weight of a soil sample if its dry weight is 1.6 tons, moisture content is 15%, and volume is 1 m³.

   Hint

   Consider how to convert moisture content into a weight contribution.

6. 6.

   Describe the effect of increasing void ratio on the saturated unit weight of soils.

   Hint

   Examine the interplay between voids and saturation in soils.