Soil Mechanics and Foundation
Coefficient of compressibility is

different for different types of soils and also different for a soil under different states of consolidation
constant for any type of soil
independent of type of soil but depends on the stress history of soil
different for different types of soils but same for a soil under different states of consolidation

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

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Soil Mechanics and Foundation
Within the consolidation process of a saturated clay

a gradual increase in neutral pressure and a gradual decrease in effective pressure takes place and sum of the two is constant
a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant
both neutral pressure and effective pressure decrease
both neutral pressure and effective pressure increase

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