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
Why is this the answer?
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.
Related Soil Mechanics MCQs
More solved Soil Mechanics questions for AE/JE Civil Engineering exams.
- The 'Hvorslev parameters' c_e and φ_e in soil mechanics refer to:
- 'Vibro-flotation' (vibro-compaction) is used to densify:
- The 'International Building Code' (IBC) and IS codes classify building sites for...
- The 'IS 2911' code series covers:
- The 'primary consolidation' of a clay layer settles because:
- The 'shear strength' of soil measured in an 'undrained triaxial test' (UU test) is:
Practice more Civil Engineering questions
This MCQ belongs to JE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.