Abstract：Based on the principle of pseudo static loading and centrifugal model tests，the dynamical characteristics of landslips of loose slope under seismic loading are analyzed by means of the landslips of sand-pile models with one slope，which are used as simplification pattern of loose slopes. Firstly，three centrifugal model tests of uniform sand with size distribution of 0.5–1 mm and 8–10 mm and non-uniform sand with a heterogeneous coefficient f = 3.10，are designed. In these centrifugal model tests，the dynamical characteristics of landslips of loose slopes are simulated under seismic loadings with three magnitudes，i.e. V，VI and VII. The test results show：(1) landslips of uniform sand with size 0.5–1 mm obey quasi-cyclical distribution under seismic loadings with magnitudes V，VI and VII；(2) landslips of uniform sand with size 8–10 mm and nonuniform sand with f = 3.10 obey negative power distribution law under seismic loading with magnitude V，displaying self-organized criticality(SOC)；and (3) landslips of uniform sand with size 8–10 mm and nonuniform sand with f = 3.10 show normal distribution under seismic loading with magnitudes VI and VII. As for the three dynamical characteristics，it is indicated that the landslips of uniform sand with size 0.5–1 mm under seismic loading with magnitudes V，VI and VII are predicted；but the landslips of uniform sand with size 8–10 mm and nonuniform sand with f = 3.10 under the three earthquake magnitudes can not be accurately forecasted. The research conclusions can offer some favorable references to aseismic design of loose slopes.
