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

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

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Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

Precise measurement of pore pressure and change in volume during test, is not possible
It can be performed under all three drainage conditions with complete control
None of these
Stress distribution on the failure plane, is non uniform

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