ABSTRACT
A series of triaxial shear tests on intact unsaturated loess were conducted using CT-multi-function triaxial apparatus developed in Logistical Engineering University. The distinct CT images and detailed CT data during the evolution of meso-structure were obtained nondestructively. A new method was proposed to identify the yield stress of intact loess using curves of CT-number versus deviatoric stress. Data analyzed from captured images were used to define a structure parameter and an evolution variable which characterized the evolution of meso-structure. An equation describing the evolution of structure was developed. The equation reflected the influences of net cell pressure and suction on the evolution of meso-structure.
