Soil Mechanics and Foundation
Coefficient of compressibility is

different for different types of soils but same for a soil under different states of consolidation
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

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Soil Mechanics and Foundation
In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as

unconsolidated drained test
consolidated drained test
unconsolidated undrained test
consolidated undrained test

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Soil Mechanics and Foundation
Effective stress on soil

Decreases both voids ratio and permeability
Increases both voids ratio and permeability
Decreases voids ratio and increases permeability
Increases voids ratio and decreases permeability

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