基于离散元的行车荷载作用下沥青砂浆迁移规律研究  

Research on Asphalt Mortar Migration Law Under Driving Load Based on Discrete Element Method

作　　者：李奕佳 岳宗豪 Li Yijia;Yue Zonghao(Research Institute of PetroChina Fuel Oil Co.,Ltd.,Beijing 100195,China)

机构地区：[1]中石油燃料油有限责任公司研究院,北京100195

出　　处：《市政技术》2022年第1期48-53,共6页Journal of Municipal Technology

基　　金：国家自然科学基金资助项目(U20A20315);中石油燃料油有限责任公司科研项目(RLY-2020Y-06)。

摘　　要：为研究行车荷载作用下沥青砂浆的迁移规律,借助离散元软件PFC2D建立了沥青混合料二维离散元模型,通过改变沥青砂浆Burgers模型的宏观参数,模拟了40、50和60℃温度下的沥青混合料黏弹状态,并利用时温等效原理,进行虚拟汉堡车辙试验,分析了沥青砂浆的迁移规律和温度对沥青砂浆迁移的影响。研究结果表明:在行车荷载作用下,随着试件深度的增加,沥青砂浆迁移量逐渐减小,但4 cm深度以下的沥青砂浆迁移量可忽略不计;温度越高,沥青砂浆Burgers模型宏观参数越小,沥青砂浆流动性越大,位移量越大。In order to study the migration law of asphalt mortar under driving load, a two-dimensional discrete element model of asphalt mixture is established by discrete element software PFC2 D. By changing the macro parameters of asphalt mortar Burgers model, the viscoelastic state of asphalt mixture at 40 ℃、50 ℃ and 60 ℃ are simulated. The virtual Hamburg rutting test is carried out by the principle of time-temperature equivalence. The migration law of asphalt mortar and the influence of temperature on the migration of asphalt mortar are analyzed. The results show that under the action of driving load, the migration amount of asphalt mortar decreases gradually with the increase of specimen depth. But the migration amount of asphalt mortar below 4 cm depth can be ignored;The higher the temperature is, the smaller the macro parameters of asphalt mortar Burgers model is, the greater the fluidity of asphalt mortar is and the greater the displacement is.

关 键 词：沥青混合料 离散元 沥青砂浆 迁移规律 

分 类 号：U414.1[交通运输工程—道路与铁道工程]