Abstract
This paper examines the influences of the aspect ratio on the bifurcation analysis for a non-coaxial and a coaxial Cam-clay model of normally consolidated clays during undrained shear under plane strain condition. The bifurcation analyses are carried out considering the difference between the aspect ratio at the onset of bifurcation and the initial aspect ratio.
As a result, we show the existence of the symmetric bulging mode, which is often observed in the experiment. We also examine the sites where the slip surfaces first occur and the patterns of the slip surfaces by judging from the distributions of maximum shear strain
