不同粒径及级配对碎石料休止角影响的试验研究

Experimental Research on the Influence of Particle Size and Gradation on Repose Angle of Rockfill

为探究不同粒径及级配对碎石料休止角的影响,通过散粒体边坡堆积试验中改进的碎石料休止角测量方法,对不同粒径及级配碎石料休止角进行测量,并结合试验堆积现象进行观察分析。结果表明:随均质粒径碎石料粒径的增大,休止角逐渐增大;随不均匀系数的增加,平均粒径对休止角的影响逐渐变小;不均匀系数对休止角的影响呈先增大后趋于稳定;颗粒级配分布愈不均匀,散粒体边坡休止角越大。

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.