Effects of cyclic loading history on liquefaction resistance for saturated sand

抄録

Recently, numerous geological hazards induced by soil liquefaction have been reported in areas not traditionally considered alert zones. The multiple shocks resulting from a significant earthquake, specifically the dynamic shear history, influence the behavior of liquefaction resistance—a key factor in understanding these occurrences. Despite its significance, there is currently a lack of research aimed at determining the liquefaction behaviors subjected to dynamic shear history. This study conducted a series of cyclic triaxial tests using fine silica sand and explored the behaviors encountered during the dynamic shear history of the cyclic loading-reconsolidation progress. The results reveal that, with the maximum excess pore water pressure (EPWP) occurring during cyclic loading, liquefaction resistance undergoes two phases: an initial increase followed by a subsequent decrease compared to virgin liquefaction. The increasing phase occurs within the EPWP ratio range of 0–0.8. Notably, the maximum EPWP, rather than residual strain, governs the accumulated anisotropy and reliquefaction behaviors.