Abutments occupy an important position in a bridge system.The stability of a bridge station directly affects the seismic performance of a bridge.Vast amounts of seismic damage and bridge failure caused by abutment damage have occurred.This damage is often accompanied by large ground deformation induced by soil liquefaction.To study the landslide mechanism of abutment in liquefied sites,the fully coupled effective stress analysis method was used to simulate the characteristics of liquefied sand under a seismic load with a Paster-Zienkiewicz-modified Mark-III model.The effects of beam weight and liquefied layer position on abutment displacement were studied.The compaction effects on sandy soil liquefaction were also analyzed.Numerical simulation produced results consistent with those of the shaking table test suggests the ramming processing alone does not reduce the risk of sand liquefaction.