Soil Mechanics and Foundation
Terzaghi’s theory of one dimensional consolidation assumes

Deformation of the soil, is entirely due to change in volume
Water and soil particles are incompressible
All listed here
Soil is homogeneous and fully saturated

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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
Stress distribution on the failure plane, is non uniform
None of these
It can be performed under all three drainage conditions with complete control

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