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Influence of particle size and gradation on repose angle of coarse-grained soil
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摘要: 为了准确且方便地测量粗颗粒土的休止角，研制了一种基于旋转容器法的粗颗粒土休止角测定仪。利用此装置，对2种粗颗粒土分别进行了15种级配下的休止角试验，并研究了颗粒形状和级配对粗颗粒土休止角的影响。试验结果表明：对于级配相同、颗粒形状不同的粗颗粒土，颗粒呈棱角状砾石料的休止角大于颗粒圆滑的卵石料，不同最大粒径下砾石料的休止角平均值比卵石料高1.3°~2.0°；对于颗粒形状相同、级配不同的粗颗粒土，休止角随最大粒径的增加而增大，最大粒径为20~40 mm时，休止角平均值增长曲线平缓，最大粒径为40~60 mm时，休止角平均值增长速率明显变快；休止角随平均粒径的增大而减小，随不均匀系数的增加而增大。Abstract: In order to measure the repose angle of the coarse-grained soils accurately and easily, an apparatus based on rotatable-vessel method is described in this paper. 15 tests with different gradations were carried out on two kinds of coarse-grained soils with the proposed apparatus, respectively. The influences that the particle shape and gradation have on the repose angles of coarse-grained soils are investigated. The results show that for soils with the same gradation, the repose angles of gravel with angular particles are higher than those of the cobble with smooth particles, and the average repose angles of gravel are 1.3°~2.0°higher than those of cobble with different maximum grain sizes. For soils with the same shape, the angles of repose increase with the increase of the maximum particle size. When the maximum particle size equals 20~ 40 mm, the average repose angles increase slowly, while the increasing rate increases with the maximum particle size of 40~ 60 mm. The repose angles decrease with the increase of the mean particle size and increase with the increase of the non-uniform coefficient.
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Key words:
- coarse-grained soils /
- angle of repose /
- measuring apparatus /
- particle shape /
- gradation
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图 2 休止角测定仪示意
Figure 2. Schematic of the measuring apparatus for the angles of repose of coarse-grained soils
图 7 两种粗颗粒土休止角与d50关系
Figure 7. Relationship between the repose angles and d50 of two kinds of coarse-grained soils
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