Geo-grid reinforced retaining wall is a flexible retaining structure.It will undergo large deformation during earthquake.Deformation is a key problem for geo-structure safety.To study the seismic deformation of geo-grid reinforced retaining wall

non-linear finite difference method is applied to analyze the effect of seismic deformation and geo-grid force under different geo-grid length and earthquake excitation level.The calculation results show that the deformation of segmental geo-grid reinforced retaining wall has a tilting deformation mode and seismic residual deformation at top of the wall is the greatest.The geo-grid has a critical effective reinforced length and the value between 0.7 and 1.0 of wall height is the best.The geo-grid force gradually increases and then decreases from the top to the bottom of the wall and the greatest force exists in the lower part of wall.The distribution feature is similar to the distribution of earth pressure acting on the flexible retaining structure.