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Critical State Line

Critical State Line

(OP)

Hello everyone,

For critical Sate soil mechanics
Whats the status of critical state line? Is it always above or below the NCL?
Whats the reason for its being above or below?

If Initial condiiton of a volume of a granular material is above Critical state line and the material
is then sheared in undrained conditions, the value of P' at failure will be lower than the initial one.
Whats the reason behind it?

What does critical state line defines? Does it define relationship between mean effective stress P',
Deviatoric stress q and specific volume V which identifies peak strength of a granular material.
If not this what things can we conclude from critical state soil mechanics line?


Critical state line defines relationship between mean effective stress P' , deviatoric stress q and specific volume V
which identifies condition at which material can be sheared without changes in volume and in shearing stress.

Whats the reason behind critical state line being independent of state of material
(whether its loose, over consolidated or normally consolidated)??

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