Dynamic analysis of subgrade soil in flood area considering seismic liquefaction

The saturated silt ground in this area which was exerted by seismic loads was simulated numerically by using FLAC-3D. Liquefaction in surface of powder foundation occurred less likely and with the increasing depth of foundation it occurred more likely. The density of soil in upper layer increased because of the role of dynamic compaction. And as density increased, the dynamic strength of soil in this region improved, thus improving the soil liquefaction resistance. The paper had some guidance significance for the liquefaction of foundation under the effect of seismic and dynamic load in in the Yellow River flood areas in China and scientific forecast of transmutation, possessed engineering practice importance for road foundation treatment, and was provided with promotion effect for the study of foundation soil changes under the effect of dynamic load.