Lateral spreading due to liquefaction of sandy soils is a significant cause of damage to the important engineering facilities and buildings in earthquakes. FLIP ROSE is a two-dimensional finite element analysis program for seismic liquefaction problems. A strain space multiple mechanism model (cocktail glass model) is implemented in the program for analysis of the granular material. A two dimensional finite element model is proposed to predict and analyze liquefaction-induced lateral spreading in gently sloping ground under the seismic loading. This numerical simulation model is verified using the excess pore water pressure

the lateral acceleration

the arias intensity and the lateral displacement time histories recorded in three sets of free-field lateral spreading centrifuge tests. The computed response shows good agreement with the centrifuge test measurements. The final lateral displacements in the gently sloping ground with the different gradients are predicted by this simulation model after sandy liquefaction. It shows that the gradient of gently sloping ground plays a more and more important role in the liquefaction-induced lateral spreading as the depth increases.