集料CBR颗粒流模拟与强嵌挤粗集料骨架级配设计  

CBR particle flow simulation of aggregate and design of coarse aggregate skeleton gradation with strong interlocked force

作　　者：戴学臻[1] 蒋应军[1] 任皎龙[1] 董国军 孙廷选 刘根昌 

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 [2]濮阳市公路管理局,河南濮阳457000 [3]许昌市公路管理局,河南许昌461000

出　　处：《交通运输工程学报》2011年第3期10-15,共6页Journal of Traffic and Transportation Engineering

基　　金：中央高校基本科研业务费专项资金项目(CHD2009JC108);教育部新世纪优秀人才支持计划项目(NCET-08-0749)

摘　　要：应用PFC2D模拟了集料加州承载比（CBR）试验,分析了单规格粗集料、合成粗集料与粗细混合集料的CBR变化规律,提出了强嵌挤粗集料骨架级配,并对其力学性能进行了室内试验验证。研究结果表明：19-31.5 mm集料构成了具有强嵌挤力的主骨架结构,最佳质量分数为50%-70%;9.5-19 mm和4.75-9.5 mm集料具有填充主骨架空隙或干涉主骨架结构形成的作用,4.75-9.5 mm集料最佳质量分数为10%;粗细集料最佳比例为65∶35,此时粗细混合集料CBR值最大,大于540%;由强嵌挤粗集料骨架级配组成的混合料的CBR和抗压强度分别为规范级配的1.19倍和1.10倍以上,证明了粗集料级配具有良好的力学性能。California bearing ratio（CBR） test was simulated by using PFC2D,CBR changing laws of single coarse aggregate,synthetic coarse aggregate and coarse-fine combined aggregate were analyzed,a coarse aggregate skeleton gradation with high interlocked force was put forward,and its performances were verified through laboratory test.Test result shows that the main skeleton structure composed of the aggregate with diameter 19-31.5 mm has high interlocked force,and the optimal mass fraction is 50%-70%.The aggregates with diameter 9.5-19 mm and 4.75-9.5 mm have the effects of filling the void of main skeleton structure and interfering its composing,and the optimal mass fraction of the aggregate with diameter 4.75-9.5 mm is 10%.When the optimum proportion of coarse aggregate to fine aggregate is 65∶35,the CBR value of coarse-fine combined aggregate reaches the highest point,and is more than 540%.The CBR value and compressive strength of the mixture composed of the coarse gradation are over 1.19 times and 1.10 times than that of standard gradation respectively,so the coarse gradation has better mechanical properties.7 tabs,6 figs,14 refs.

关 键 词：路面工程 粗集料骨架级配 颗粒流模拟 单规格粗集料 合成粗集料 粗细混合集料 加州承载比 

分 类 号：U414[交通运输工程—道路与铁道工程]