The overconsolidation ratio of a clay is defined as the ratio of:
Correct answer: D. Preconsolidation pressure to current effective stress
- A. Current effective stress to total stress
- B. Void ratio to degree of saturation
- C. Total stress to pore water pressure
- D. Preconsolidation pressure to current effective stress
Explanation
OCR is the preconsolidation pressure divided by the current effective vertical stress. A value greater than one indicates that the soil experienced a higher effective stress in the past.
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About Soil Mechanics and Foundations
Soil mechanics examines index properties, phase relationships, classification, permeability, seepage, compaction, consolidation, shear strength and earth pressure. Foundations apply these principles to bearing capacity, settlement and shallow or deep foundation selection, with clear distinction between compaction, which expels air, and consolidation, which expels water over time.
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