Abstract: Based on many dynamic test results about rockfill materials of domestic earth-rock dams, the dynamic residual deformation characteristics of the rockfill materials are studied. During the process of collecting test data, the primary residual deformation model presented by Shen Zhu-jiang is modified along with considering the affect of consolidation ratio and fitting the test data well. Through dynamic residual deformation analysis and calculation of ideal concrete faced rockfill dam (CFRD), the similarities and differences between the primary residual deformation models presented by Shen Zhu-jiang, Kong Xian-jing, Ling Hua and this paper are given. Then, the rationality of this improved model is elaborated. In addition, based on the statistic analysis of test results, the average, upper and lower envelopes of the curves of - and - are proposed to calculate the seismic residual deformation of the rockfill materials. With the application of the above, the deformation behaviors of ideal CFRD are numerically analyzed. The results show that the parameters of c4 and c5 have great impact on the residual deformation of the dam; but the parameters of c1 and c2 have almost no effect. It’s significant to apply the mean curve parameters in seismic design of medium and small earth-rock dams and the result has certain reference value.

Key words: earth-rock dam, residual deformation, rockfill materials, sensibility analysis