The overconsolidation ratio (OCR) is a measure that indicates the history of loading on a soil sample, defined as the ratio of the maximum past effective stress to the current effective stress. This value helps to determine whether a soil is normally consolidated or overconsolidated, which has important implications for its compressibility and strength. The OCR is crucial for understanding soil behavior during consolidation tests like the oedometer test, as it can greatly influence the results and subsequent analysis.
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