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

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Soil Mechanics and Foundation
Effective stress on soil

Decreases voids ratio and increases permeability
Decreases both voids ratio and permeability
Increases voids ratio and decreases permeability
Increases both voids ratio and permeability

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Soil Mechanics and Foundation
The average coefficient of permeability of natural deposits

Parallel to stratification is always greater than that perpendicular to stratification
Parallel to stratification is always less than that perpendicular to stratification
Parallel to stratification may or may not be greater than that perpendicular to stratification
Is always same in both directions

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