Analysis of strain localization in porous media with transversely isotropic elasticity under undrained conditions

The properties of strain localization for elastic-plastic porous media with transversely isotro-
pic elasticity under undrained conditions are investigated. Under non-associated plasticity
and tri-axial stress states, the conditions for strain localization of elastic-plastic porous me-
dia are derived, in which the effects of deviation from isotropic elasticity and pore fluid
compressibility are included. Based on the Mohr-Coulomb yield criterion, the influences of
the deviation from isotropic elasticity and pore fluid compressibility on the direction angle
of localized band initiation and the corresponding critical hardening modulus for the case
of plane strain are discussed. As a result, the properties of strain localization are dependent
upon the deviation from isotropic elasticity and pore fluid compressibility. The deviation
from isotropic elasticity and pore fluid compressibility has significant impacts on the direc-
tion angle of localized band initiation and the corresponding critical hardening modulus.