Compactness Condition SPT N-Value Very Loose <4 Loose 4-10 Compact 10-30 Dense 30-50 Very Dense >50 Terminology describing consistency of cohesive soils:
AI summary The text provides a table defining soil compactness conditions based on the Standard Penetration Test (SPT) N-value, which is a measure used in geotechnical engineering to assess soil density.
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AI summary The standard terminology to describe cohesive soils includes consistency, which is based on undrained shear strength, measured by in-situ vane tests, penetrometer tests, or unconfined compression tests. Consistency may be crudely estimated from SPT N value, based on the correlation shown in the following table. Terzaghi and Peck’s correlation to SPT N value is used with caution as it is only very approximate.
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