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对某原型级配粗粒料,按规范要求采用剔除法、等量替代法、相似级配法、混合法等4种缩尺方法,获得15条模拟级配,相应的最大颗粒粒径分别为60、40、20 mm。在相同振动功能条件下,对模拟级配进行了最大干密度试验,研究同一原型级配经不同级配缩尺方法后其最大干密度值的变化规律。分析认为,最大干密度与缩尺后级配的不均匀系数、曲率系数、最大颗粒粒径、小于5 mm粒组含量等参量相关,提出了修正级配参数方法,即将最大干密度与级配相关参量归一化。最后进行了试样尺寸直径为1 m的原型级配粗粒料的击实试验,验证了归一化公式的合理性。
For a prototype gradation coarse aggregate, according to the specifications, four scale methods such as culling method, equivalent substitution method, similar gradation method and mixing method were used to obtain 15 simulated gradations. The corresponding maximum particle sizes were 60,40,20 mm. Under the same vibration function, the maximum dry density test was carried out on the simulated gradation, and the variation of the maximum dry density of the same prototype gradation after different scales were measured. The analysis shows that the maximum dry density is related to the non-uniform coefficient, the curvature coefficient, the maximum particle size and the content of the particles less than 5 mm after the scale scale. Correlation grading parameter method is proposed, that is, the maximum dry density and gradation Related parameters normalized. Finally, the compaction test of the prototype graded coarse aggregate with the sample size of 1 m in diameter was carried out to verify the rationality of the normalized formula.