Soil Mechanics and Foundation
Time factor for a clay layer is

a dimensional parameter
directly proportional to permeability of soil
inversely proportional to drainage path
independent of thickness of clay layer

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Soil Mechanics and Foundation
For a loose sand sample and a dense sand sample consolidated to the same effective stress

ultimate strength is different but peak strength is same
ultimate strength is same and also peak strength is same
ultimate strength is same but peak
ultimate strength is same but peak strength of dense sand is greater than that of loose sand

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