Abstract: In order to explore the influence of gradation and particle size on repose angle of rockfill, we conducted accumulation model test of granular mixtures slope and analyzed the accumulation phenomenon. Then we measured the repose angle of rockfill material with different particle sizes and gradations by improved measuring method. The results show that repose angle increases gradually with the increase of particle size of homogeneous rockfill. The influence of average particle size on repose angle is weakened gradually with the increase of non-uniform coefficient, while the influence of non-uniform coefficient on the repose angle increases firstly and then keeps stable. Besides, the repose angle of granular mixtures becomes larger when the particle size distribution is more uneven.

Key words: rockfill material, repose angle, granular mixtures slope, non-uniform coefficient, accumulation phenomenon