In the 'Cam Clay model' for soil behaviour, the 'yield surface' represents:
Choose the correct answer
The boundary below which no stress can exist
Boundary separating elastic (inside) from elastoplastic (outside) behaviour in p'−q space for clay
The shear strength failure line only
Creep behaviour of clay
Correct Answer
B. Boundary separating elastic (inside) from elastoplastic (outside) behaviour in p'−q space for clay
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Cam Clay: critical state model for normally consolidated clays. Yield surface (ellipse in p'-q space where p' = mean effective stress, q = deviatoric stress) separates: (1) Inside — elastic (recoverable) behaviour; (2) Outside — elastoplastic (volumetric yielding, compression). The surface passes through origin and critical state line intersection. Hardening: yield surface expands with plastic compression. Widely used in FEM for clay.
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