Experimental Study on Cyclic Loading and Unloading of Remodeled Loess Using True Triaxial Testing

True triaxial tests of cyclic loading and unloading were carried out on remodeled loess, and the effects of the anisotropic consolidation ratio (K=σ1c/σ3c), intermediate principal stress coefficient (b=σ2−σ3/σ1−σ3), and cyclic loading on the deformation characteristics of the loess were analyzed. The results show that principal strain develops in two stages: a rapid initial increase followed by a slower increase until stabilization. Plastic volumetric strain is found to increase with increases in cyclic loading, anisotropic consolidation ratio, and intermediate principal stress coefficient. After normalization, the consolidation mode has a large effect on the plastic volumetric strain ratio, while the intermediate principal stress coefficient has a smaller effect. All types of plastic shear strain exhibit shear shrinkage, increasing with increases in cyclic loading and the intermediate principal stress coefficient, with no obvious relationship with the anisotropic consolidation ratio. After normalization, the consolidation mode and the intermediate principal stress coefficient have significant effects on the plastic shear strain ratio.

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