This paper descibes a simple method for evaluating the maximum excess pore pressure of normally consolidated cohesive soils during undrained shear in triaxial tests.
Isotropically consolidated undrained triaxial compression (ClUC), K_0-consolidated undrained triaxial compression (CK_0UC), isotropically consolidated undrained triaxial extension (CIUE), and K_0-consolidated undrained triaxial extension (CK_0UE) tests were carried out on twelve soils to explore the interrelationships between maximum excess pore pressure obtained from these test types and plasticity index.
Different correlation is obtained with variation in either consolidatron history (isotropic or K_0-consolidation) and shear under a given stress path (compression or extension loadings). Consistency of data from Kawasaki clay- mixture series and natural clays suggests that the maximum excess pore pressure of natural clays during undrained shear can be extrapolated from results obtained on Kawasaki clay-mixture series only.