Soil Mechanics - Calculation Questions

Calculate the Effective Stree for the following conditions. Effective Stress (σ') = Total Stress (σ) = 3000 lb/ft2 - Pore Water Pressure (u) 1500 lb/ft2.

• 1000 lb/ft2

• 1500 lb/ft2

• 2000 lb/ft2

• 2500 lb/ft2

What is the formula for calculating total stress (σ) in the given problem?

• (γ_sand * h_sand) + (γ_clay * h_clay)

• (γ_water * h_water)

• σ' = σ - u

• u = γ_water * h_water

What is the unit weight of the water per lb/ft2 (γ_water)?

• 62.4 lb/ft³

• 120 lb/ft³

• 110 lb/ft³

• 2850 lb/ft²

The void ratio (e) is calculated as the volume of voids (Vv) divided by the volume of solids (Vs). If Vv is 0.51 ft³ and Vs is 0.59 ft³, What is the void ratio?

• 0.59

• 0.69

• 0.79

• 0.86

Fill in the blank: The porosity (n) is calculated as the volume of voids divided by the total volume. If the total volume is 1 ft³ and the volume of voids is 0.51 ft³, the porosity is ____. A) 31% B) 41% C) 51% D) 61%.

• 31%

• 41%

• 51%

• 61%