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

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Soil Mechanics and Foundation
Within the consolidation process of a saturated clay

both neutral pressure and effective pressure decrease
both neutral pressure and effective pressure increase
a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant
a gradual increase in neutral pressure and a gradual decrease in effective pressure takes place and sum of the two is constant

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