Untitled 1

γsoil = 19.5kN/m3

a. Pv @ 4m depth = 19.5kN/m³ x 4m = 78kN/m² = 78kPa

b. If watertable is at ground surface - P or σ_v 78 kN/m² - γ_w (4m) = 78 - (9.81kN/m³ x 4m) = 38.76 kN/m² = 38.76kPa

c. If watertable is at 2m depth - P or σ_{v
= (19.5 kN/m3 x 4m) -}γ_w(2m) = 78 - 19.62 = 58.38 kPa