QUESTION
Objective Question
For the soil profile shown taking gw kN/m3, the effective vertical stress at the, middle of the
sand layer is clay g = 16 kN/m3
Answer
( Option D)
82 kN/m2
Solution
σ = Total stress = q + gH+gsat × h
= 20+ (16 × 2) + (20 × 1.5)
= 82 kN/m2
u = Pore pressure = gwh
= 10 x 1.5 = 15 kN/m2
σ' = effective stress = σ -u
= 82 – 15 = 67 kN/m2
