基于DEM和3D重构技术的超薄抗滑封层混凝土细观压实仿真  

Micro-compaction simulation of ultra-thin and anti-slip sealing layer based on DEM and 3D reconstruction

作　　者：宗海 朱文白 汪昊 何嘉明 赵永利[2] 谢一畅 ZONG Hai;ZHU Wenbai;WANG Hao;HE Jiaming;ZHAO Yongli;XIE Yichang(Nanjing Highway Development(Group)Co.,Ltd.,Nanjing 210000,China;School of Transportation,Southeast University,Nanjing 211189,China)

机构地区：[1]南京公路发展(集团)有限公司,江苏南京210000 [2]东南大学交通学院,江苏南京211189

出　　处：《混凝土》2024年第7期69-72,77,共5页Concrete

基　　金：国家自然科学基金(52078132);公路集团路面超薄抗滑层预防养护关键技术研究及工程示范应用项目。

摘　　要：为了研究超薄抗滑封层混凝土的压实机理与碎石分布,通过CT扫描和3D重构技术对真实的碎石颗粒进行轮廓扫描和三维重建。在此基础上利用EDEM离散元软件建立凸多面体颗粒和压实模型,从颗粒接触动力学角度分析压实过程中颗粒排布、接触力以及配位数的变化。结果表明:由三维重构模型得到的碎石洒布空隙率与实际一致。压实前、后颗粒接触拓扑图的颜色、粗细程度的演化反映出颗粒碰撞的程度。同时在压实荷载作用下,颗粒的平均接触力和配位数逐渐增加并趋于稳定。因此碎石颗粒能够形成稳固的嵌挤结构,从而保障路面的抗滑性能和抗剥落性能。In order to study the compaction mechanism of ultra-thin anti-slip sliding sealing layer and gravel distribution,the contour scanning and 3D reconstruction of real gravel particles were carried out by CT scanning and 3D reconstruction technology.On this basis,EDEM discrete element software was used to establish the model of convex polyhedron particle and compaction,and the changes of parti-cle topology,contact force and coordination number during compaction were analyzed by particle contact dynamics.Results show that the airvoid of three-dimensional reconstruction models is consistent with the actual situation.The topology evolution is connected with the col-or and thickness of contact vectors during compaction.Moreover,the average contact force and coordination number of particles keep in-creasing and stabilizing with loading.Therefore,gravel particles can form solid embedded structure and ensure the anti-sliding performance and spalling resistance of pavement.

关 键 词：沥青路面 超薄抗滑封层混凝土 压实仿真 DEM 3D重构 

分 类 号：TU528.01[建筑科学—建筑技术科学]