级配对粗颗粒土休止角影响试验研究

Experimental research on the influence of gradation on angle of repose of coarse-grained soils

为探究级配对粗颗粒土休止角的影响,人工设计了不同级配土料,计算出级配参数最大粒径dmax、不均匀系数cu和曲率系数cc,并由试验测定各个级配土料对应的休止角,研究了级配参数对休止角的影响。结果表明:随着最大粒径dmax、不均匀系数cu、曲率系数cc的增大,休止角整体有增大的趋势,其中最大粒径dmax对休止角的影响更为显著。在此基础上,提出了一种将休止角与级配之间归一化的方法,拟合了休止角与级配参数dmax、cu和cc之间的关系公式,并通过室内试验验证了公式的合理性。

In order to explore the effect of gradation on the angle of repose of coarse grain soil,gradationparameters dmax,cu and cc are calculated for different graded soils,the angle of repose of each gradationsoil material is tested by experiment,the influence of gradation parameters on the angle of repose isstudied.The results show:with the increase of dmax,cu and cc,the angle of repose increases.On the basisof this,a method of normalizing the angle of repose and gradation is proposed,the relationship betweenthe angle of repose and the gradation parameters dmax,cu and cc is found.The rationality of the formula isverifi ed by laboratory experiments.