Soil Mechanics and Foundation
In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on

all planes except horizontal and vertical planes
both horizontal and vertical planes
horizontal plane only
vertical plane only

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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
Stress distribution on the failure plane, is non uniform
None of these

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