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The results of a consolidation test on an undisturbed soil, sampled at a depth of 10 m below the ground level are as follows:
Saturated unit weight: 16 kN/m³
Pre-consolidation pressure: 90 kPa
The water table was encountered at the ground level. Assuming the unit weight of water as 10 kN/m³, the over-consolidation ratio of the soil is
- 0.67
- 1.50
- 1.77
- 2.00
Correct answer: 1.50
Solution
With water table at the surface, gamma' = 16 - 10 = 6 kN/m3, so the current vertical effective stress at 10 m is 6*10 = 60 kPa. OCR = preconsolidation pressure / effective overburden = 90/60 = 1.5.
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