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a normally conslidatet clay was conslidated under equal all-round pressure of 4200 lb/ft2 , then sheared...

a normally conslidatet clay was conslidated under equal all-round pressure of 4200 lb/ft2 , then sheared undrained in axial compression . the principal stress diffrence at faiure ( /\ -f ) was 2100 lb/ft^2 and the induced pore pressure at faliure ( /\u f) was 1764 lb/ft^2
find the
1-friction angle of the soile in terms of total stress (c'=c=0) (degrees)
2-friction angle of the soile in terms of effective stress (c'=c=0) (degrees)
3-the anle of the failuer plane in the specimen

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