矿料强嵌挤骨架密实级配的PFC^(2D)数值试验研究  

Investigation into Close-Grained Gradation of Aggregates Skeleton Under Strong Interlocked Force via PFC^(2D) Numerical Test

作　　者：蒋应军[1] 任皎龙[1] 李頔[1] 徐寅善[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《华南理工大学学报（自然科学版）》2012年第2期92-98,103,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：中央高校基本科研业务费专项资金(CHD2009JC108);教育部新世纪优秀人才支持计划项目(NCET-08-0749);长安大学基础研究支持计划专项基金(CHD2011ZY007)

摘　　要：为了充分优化矿料级配,应用PFC2D构建了矿料密实度和加州承载比(CBR)的数值试验方法,在可靠性验证的基础上,分析了合成粗集料、合成细集料、粗细混合集料的密实度和CBR变化规律,提出了矿料强嵌挤骨架密实级配,并对其力学性能进行了室内试验验证.结果表明:19～31.5mm集料、9.5～19mm集料和4.75～9.5mm集料3种规格粗集料的最佳质量比分别为70∶20∶10、60∶30∶10、60∶20∶20和50∶30∶20,2.36～4.75mm集料、0.6～2.36mm集料和0.6mm以下集料3种规格细集料的最佳质量比为38.5∶16.5∶45、33∶22∶45、36∶24∶40和30∶30∶40,粗细混合集料的最佳比例为65∶35;由矿料强嵌挤骨架密实级配组成的级配碎石的CBR值和抗压强度分别为规范级配的1.16倍和1.12倍以上,证明该级配具有良好的力学性能.In order to well optimize the mineral gradation, a method to numerically test the compactness and the California bearing ratio （CBR） of aggregates via PFC^2D was proposed. Then, based on the reliability analysis, the variation laws of the compactness and the CBR were analyzed respectively for synthetic coarse aggregates, synthetic fine aggregates and coarse-fine combined aggregates, and a close-grained gradation of aggregates skeleton under strong interlocked force was proposed. Moreover, the mechanical performances of the aggregates skeleton were veri- fied through laboratory tests. The results show that the optimal mass ratios of the coarse aggregates with the diame- ters of 19 -31.5mm, 9.5 - 19mm and 4.75 -9.5mm are respectively 0：20 ： 10, 60：30 ： 10, 60：20：20 and 50：30：20, while those of the fine aggregates with the diameters of 2.36 -4.75mm, 0.6 -2.36mm and less than 0.6mm are respectively 38.5 ： 16.5 ： 45,33 ： 22 ： 45, 36 ： 24 ： 40 and 30 ： 30 ： 40, and that the optimal mass ratio of coarse-fine combined aggregates is 65 ： 35. It is also found that the graded broken stone composed of the aggregates skeleton with close-grained gradation under strong interlocked force is of excellent mechanical properties because its CBR and compressive strength are respectively 1.16 and 1.12 times those of the standard gradation.

关 键 词：道路工程 矿料骨架 级配 颗粒流 数值试验 加州承载比 密实度 

分 类 号：U417.11[交通运输工程—道路与铁道工程]