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 time
pore water pressure with depth
effective stress with time

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Soil Mechanics and Foundation
If the water table rises upto ground surface, then the

total stress is reduced due to increase in pore water pressure only but effective stress does not change
total stress is increased due to decrease in pore water pressure but effective stress does not change
effective stress is reduced due to decrease in total stress only but pore water pressure does not change
effective stress is reduced due to increase in pore water pressure only but total stress does not change

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