Soil Mechanics and Foundation
The slope of isochrone at any point at a given time indicates the rate of change of

pore water pressure with time
effective stress with time
pore water pressure with depth
effective stress with depth

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

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

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