Creep deformation is an important feature of high rockfill dams. Excessive settlement may endanger the stability of the dam or impair its normal operation. 3D FEM analysis based on power function creep constitutive model was used to predict the long term deformation of a 300 m high rockfill dam named Shuangjiangkou. Furthermore, a preliminary attempt was made to study the impact of scale effect on the long-term deformation of high rockfill dam. It was demonstrated that the deformation of Shuangjiangkou core rockfill dam becomes stable 3 years after full-filling, and under control. The scale effect research indicated that the specimens for laboratory testing have smaller long-term deformation than the real rockfill, which will influence the precision of numerical simulation.
