东南大学学报（英文版）2016，Vol.32Issue(1)：85-92,8.DOI:10.3969/j.issn.1003-7985.2016.01.015
基于离散元的粗集料静压过程的迁移与演化规律
Discrete element modeling of migration and evolution rules of coarse aggregates in the static compaction process
摘要
Abstract
To investigate migration and evolution rules of coarse aggregates in the static compaction process an algorithm of generating digital coarse aggregates that can reflect real morphology such as shape size and fracture surface of aggregate particles is represented by polyhedral particles based on the discrete element method DEM .A digital specimen comprised of aggregates and air voids is developed.In addition a static compaction model consisting of a digital specimen and three plates is constructed and a series of evaluation indices such as mean contact force σMCF wall stress in direction of z-coordinate σWSZZ porosity and coordination numbers are presented to investigate the motion rules of coarse aggregates at different compaction displacements of 7.5 15 and 30 mm.The three-dimensional static compaction model is also verified with laboratory measurements. The results indicate that the compaction displacements are positively related to σMCF and σWSZZ which increase gradually with the increase in iterative steps.When the compaction proceeds the digital specimen porosity decreases but the coordination number increases. The variation ranges of these four indices are different at different compaction displacements.This study provides a method to analyze the compaction mechanism of particle materials such as asphalt mixture and graded broken stone.关键词
沥青混合料/粗集料/静止压实/离散元模型Key words
asphalt mixture/coarse aggregate/static compaction/discrete element model分类
建筑与水利引用本文复制引用
刘卫东,高英..基于离散元的粗集料静压过程的迁移与演化规律[J].东南大学学报（英文版）,2016,32(1):85-92,8.基金项目
The National Natural Science Foundation of China No．51108081． （）
