Effective Stress in Saturated Soil
Mediumeffective stresspore pressure
Uniform saturated soil has γsat = 20 kN/m3 with the water table at the ground surface. Assuming hydrostatic conditions and no surcharge, what is the vertical effective stress at 5 m depth? Use γw = 9.81 kN/m3.
- A9.8 kPa
- B49.1 kPa
- C51.0 kPa
- D100 kPa
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Answer: C. 51.0 kPa
Total stress is σv = 20(5) = 100 kPa. Pore pressure is u = 9.81(5) = 49.05 kPa. Effective stress is σ′v = σv − u = 50.95 kPa ≈ 51.0 kPa.
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