Nonlinear numerical analysis of piles-soil interaction in lateral spreading of liquefied ground

Lateral spreading of liquefied ground due to strong earthquakes frequently causes serious damages to multi-piles foundations. The relative displacement of flowing liquefied soil to piles effects the lateral force on piles and the failure of piles. In this study, a 4-piles model in liquefiable soil with two kinds of local slopes is simulated numerically by the 3-D dynamics FE-FD coupled method, in which an fluidal elasto-plastic constitutive model is adopted to describe the saturated soil; the analysis is taken onto the pore water pressure changing of soil, the displacement of soil around piles and the reaction of front and back piles in laterally spreading, also the relationship between the relative displacement of flowing liquefied soil is discussed.