Study on the strength of dynamic shear damage of loess with complex stress action

For the dynamic characteristics of loess under complex static stress conditions, this paper utilizes hollow cylindrical specimen torsional shear test to simulate the path of static true triaxial consolidation stress state and the path of dynamic torsional shear, to provide an effective means of dynamic test for the rotational change of principal stress axis under complex static stress conditions. Through the true triaxial consolidation dynamic torsional shear test of loess in the original state of Xi'an, the dynamic shear strength and destructive strength change rule of loess under the conditions of bias consolidation and uniform pressure consolidation with different medium principal stress ratios is revealed, and the backbone curve of dynamic shear stress and dynamic shear strain of loess under the conditions of bias and uniform pressure consolidation with different medium principal stress ratios is analyzed, as well as the relationship between the destructive strength of dynamic shear and the normal normal normal stress and the average spherical stress in the consolidation, and the dynamic shear modulus Relationships between the attenuation variation with dynamic shear strain and dynamic shear strength versus normal positive stress and consolidated mean spherical stress.