Experimental study on evolution of meso-structure of intact Q2 loess during loading

摘要

A series of triaxial shear tests on unsaturated intact Q, loess were conducted using CT-multifunction triaxial apparatus developed in Logistical Engineering University. The distinct CT images and detailed CT data reflecting the evolution of mesostructure were obtained nondestructively during loading. A new method was proposed to identify the yield stress of intact Q2 loess using curves of CTnumber versus deviatoric stress. A structure parameter and an evolution variable which characterized the evolution of meso-structure were defined based CT data. An equation describing the evolution of structure during loading was proposed. The equation reflected the influences of net cell pressure and suction on the evolution of mesostructure. The proposed equation was verified by experimental data.