Soil Mechanics and Foundation
When the degree of saturation is zero, the soil mass under consideration represents

three phase system
two phase system with soil and water
one phase system
two phase system with soil and air

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

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

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