Civil Engineering MCQAE Level Civil Engineering
A soil with a pre-consolidation pressure (maximum past pressure) of 200 kPa and current effective overburden pressure of 100 kPa has an OCR (overconsolidation ratio) of:
Soil MechanicsOverconsolidation RatioMEDIUM
Choose the correct answer
A
0.5
B
1.0
C
2.0
D
100
Correct Answer
C. 2.0
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OCR = σ'_c / σ'_v0 = 200/100 = 2.0, where σ'_c = pre-consolidation pressure and σ'_v0 = current effective vertical stress. OCR > 1 means overconsolidated; OCR = 1 normally consolidated; OCR < 1 impossible in undisturbed soil.
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