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

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

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Soil Mechanics and Foundation
In a deposit of normally consolidated clay

effective stress, water content and undrained strength decrease with depth
effective stress and undrained strength increase with depth but water content decreases with depth
effective stress and water content increase with depth but undrained strength decreases with depth
effective stress increases with depth but water content of soil and un-drained strength decrease with depth

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