Assessment of tamping-based specimen preparation methods on static liquefaction of loose silty sand

Dry and moist tamping methods are widely used for the investigation of sandy soil liquefaction. However, effect these two tamping-based reconstitution on composite liquefaction behavior have been rarely assessed. In this study, dry were assessed using loose silica sand matrix (HN31) containing various amounts non-plastic silt particles (C500), by performing a series undrained triaxial compression tests. Microstructural observations high-resolution optical microscope also performed silty specimens that had similar initial states to those Triaxial results show prepared method, global dilatant was observed shear strength decreased as fraction increased. By contrast, total reversed phenomenon method: all showed more or less limited mitigated contractive tendency, which provided beneficial contribution strength. in overall structure formed host regularly deposited, promoting stable strain-hardening response. Moreover, some found be located near sand-sand contact points, significantly loosening matrix. On contrary, uniformly covered bulked particles, aggregated metastable structure, facilitating occurrence static with increase fines fraction, weakened, characterized filling large inter-sand voids, leading Thus, critical value FcTot equalling 21% determined, theoretically verified insignificant specimen preparation case, method expected disappear response changed from dominance fines.