实形粗集料三维离散元马歇尔仿真试件的构建与应用  

Construction and application of solid coarse aggregate three-dimensional discrete element Marshall simulation specimen

作　　者：邬金麒 纪伦[1] 郭宏斌 程郅策 刘济玮 谭忆秋[1] WU Jinqi;JI Lun;GUO Hongbin;CHENG Zhice;LIU Jiwei;TAN Yiqiu(School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China;Jilin Road and Bridge Engineering(Group)Co.,Ltd.,Changchun 130062,China;China MCC5 Group Corp.Ltd.,Chengdu 610011,China)

机构地区：[1]哈尔滨工业大学交通科学与工程学院,哈尔滨150090 [2]吉林省路桥工程(集团)有限公司,长春130062 [3]中国五冶集团有限公司,成都610011

出　　处：《哈尔滨工业大学学报》2025年第3期1-13,共13页Journal of Harbin Institute of Technology

基　　金：黑龙江省自然科学基金研究团队项目(TD2022E001);国家自然科学基金(U20A20315);国家重点研发计划(2016YFE0202400)。

摘　　要：为提高沥青铺面工程的质量控制技术能力,采用CT扫描获取粗集料形状,生成实形粗集料颗粒模型群组,再使用离散元软件生成具有粗集料形状和级配组成特征的沥青混合料仿真试件,探讨数字仿真试验,继而实现沥青混合料质量的数字化管控。通过4种不同接触行为:粗集料本体、砂浆-砂浆、集料-砂浆、集料-集料,与骨架结构复合构建生成马歇尔仿真试件;采用间接拉伸劈裂试验验证了模型试件的准确性,并结合质量控制典型状况进行了应用和分析。以沥青混合料低温性能为例,进行配合比优化的等体积、等质量替换性能比较的仿真试件应用分析。研究结果表明:采用三维离散元构建的马歇尔试件可有效模拟间接拉伸力学行为,并可区分质量控制过程中的典型状况;从劈裂强度和断裂能角度分析发现,等体积替换方式较等质量替换方式更接近原级配的劈裂试验性能;较大粒径范围的粗集料形貌与混合料结构联系更加紧密。实形粗集料三维离散元马歇尔仿真试件可以应用于沥青混合料的质量控制中,具有显著效果,能够使工程管控工作的开展更加方便快捷。In order to improve the quality control technology capability of asphalt pavement engineering,CT scanning is used to obtain the shape of coarse aggregate,generate a group of solid coarse aggregate particle models,and then use discrete element software to generate asphalt mixture simulation specimens with coarse aggregate shape and gradation composition characteristics.Digital simulation experiments are explored to achieve digital control of asphalt mixture quality.Marshall simulation specimens were generated by combining four different contact behaviors:coarse aggregate body,mortar mortar,aggregate mortar,and aggregate aggregate with the skeleton structure;The accuracy of the model specimen was verified by indirect tensile splitting test,and applied and analyzed in combination with typical quality control conditions.Taking the low-temperature performance of asphalt mixture as an example,the application analysis of simulation specimens for comparing the replacement performance of equal volume and equal mass with optimized mix proportion is carried out.The research results indicate that Marshall specimens constructed using three-dimensional discrete element method can effectively simulate indirect tensile mechanical behavior and distinguish typical conditions in the quality control process;From the perspective of splitting strength and fracture energy,it is found that the equal volume replacement method is closer to the splitting test performance of the original grade than the equal mass replacement method;The morphology of coarse aggregates with a larger particle size range is more closely related to the structure of the mixture.The solid coarse aggregate three-dimensional discrete element Marshall simulation specimen can be applied to the quality control of asphalt mixture,which has remarkable effect and can make the project management and control work more convenient and faster.

关 键 词：粗集料 离散元 仿真试件 接触行为 质量控制 

分 类 号：U415[交通运输工程—道路与铁道工程]