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
consolidated undrained test
unconsolidated 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
Increases voids ratio and decreases permeability
Decreases voids ratio and increases permeability

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