Influences of initial anisotropy and principal stress rotation on the undrained monotonic behavior of a loose silica sand

Triaxial compression and extension tests have been conducted under different initial anisotropy conditions to investigate the undrained response of a crushed silica sand. The loose medium specimens were prepared using moist tamping method. Five stress paths with ratios (q/p?) employed prepare anisotropically consolidated specimens. Several specific condition in which rotation occurred monotonic shearing similar reversed cyclic shear loading during an earthquake. effects induced at consolidation on onset liquefaction, phase transformation, critical state are investigated within framework Anisotropic Critical State Soil Mechanics (ACSSM). In addition, fabric evolution towards is evaluated bidirectional bender element tests. results illustrate fact that there unique anisotropic representing fabric, irrespective anisotropy, states stress. Similar line, transformation line has same loci for anisotropies.