Dynamic Characteristics of Post-Cyclic Saturated Loess

Damage to soil structure caused by strong earthquakes is one of the main reasons for post-earthquake geohazard development. To investigate nonlinear dynamic behaviors loess, a pre-shock reconsolidation test was designed simulate process loess undergoing earthquake and in natural state. Furthermore, triaxial tests specimens before after action consolidation stabilization with different over-consolidation ratios (OCR) were conducted variety modulus damping ratio saturated loess. The influence on determined. Moreover, mechanism changes discussed combining microstructure results samples reconsolidation. suggest that kinetic stiffness decreases significantly under same conditions. growth ratio-dynamic strain curve increases, deformation potential has remarkable growth. With an increase OCR, elastic increases continuously; however, significantly. weakens leads weakening interparticle cementation, pore penetration, structural reorganization local area, causes connecting macropores, produces microfractures soil, which makes significant decrease shear leading enhancement nonlinearity attenuation strength. compaction effect friction heals some microfractures, stiffness. This maximum stress amplitude post-cyclic perform at level compared without shock when OCR equals three. However, are close two.