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

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

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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

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

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Soil Mechanics and Foundation
If the water table rises upto ground surface, then the

total stress is increased due to decrease in pore water pressure but effective stress does not change
total stress is reduced due to increase in pore water pressure only but effective stress does not change
effective stress is reduced due to increase in pore water pressure only but total stress does not change
effective stress is reduced due to decrease in total stress only but pore water pressure does not change

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