Question: Discuss the differences between the critical state friction angle and What are the major limitations of determining undrained shear strength (cu) values from the field

Discuss the differences between the critical state friction angle and What are the major limitations of determining undrained shear strength (cu) values from the field vane test and the unconsolidated undrained triaxial test? Explain why the cu as obtained from the field vane test is preferred in practical applications.the residual friction angle for clay. Explain briefly why a ring shear machine has to be used to determine the residual friction angle

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