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为研究粗集料在静止压实过程中的迁移与演化规律,基于离散单元法用不规则的多面体颗粒表示真实集料的形态特征,建立了由粗集料、空隙构成的数字试件,同时,建立了由数字试件及3块板构成的静止压实模型.以平均接触力、轴向应力、空隙率及配位数为评价指标,模拟压实位移为7.5,15与30 mm时粗集料在压实过程中的运动规律,并通过室内试验验证了此模型的可靠性.结果表明:轴向应力、平均接触力随着加载的进行,数值逐渐增加,压实位移与轴向应力、平均接触力正相关;不同压实位移的空隙率随着压实的进行不断减小,而配位数逐渐增大;总体上轴向应力、平均接触力、空隙率和配位数等4个指标在不同压实位移情况下变化幅度不同.研究结果为深入分析颗粒材料如沥青混合料或级配碎石的压实机理提供了一种方法.
In order to study the migration and evolution of coarse aggregate during static compaction, discrete samples were used to represent the morphological characteristics of real aggregates by using irregular polyhedral particles. A digital specimen consisting of coarse aggregates and voids was established. At the same time, , A static compaction model composed of digital specimen and three plates was established.With the average contact force, axial stress, voidage and coordination number as the evaluation index, when the simulated compaction displacement was 7.5, 15 and 30 mm The results show that the axial stress and the average contact force increase with the loading, the value increases gradually, and the compaction displacement and axial stress , The average contact force is positive correlation; different compaction displacement porosity decreases with the compaction progressively, and the coordination number increases gradually; on the whole, the axial stress, the average contact force, the voidage and the coordination number 4 The results show that this method provides a method for in-depth analysis of the compaction mechanism of granular materials such as asphalt mixture or graded macadam.