| 引用本文: | 刘卫东,高英,黄晓明,田波.沥青路面现场压实细观特性分析[J].哈尔滨工业大学学报,2019,51(3):99.DOI:10.11918/j.issn.0367-6234.201708022 |
| LIU Weidong,GAO Ying,HUANG Xiaoming,TIAN Bo.Mesoscopic characteristics of asphalt pavement during field compaction[J].Journal of Harbin Institute of Technology,2019,51(3):99.DOI:10.11918/j.issn.0367-6234.201708022 |
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| 摘要: |
| 为研究沥青路面现场压实细观特性,基于离散元PFC3D（particle flow code in 3-dimensions）根据均布荷载-时间等效原则建立了考虑集料形态特征和温度影响的三维沥青路面压实模型,通过动态模量试验利用时间-温度等效原理确定了热态沥青混合料的细观参数,分析压实过程中路面厚度、集料运动、接触力及能量演化机制等. 结果表明:沥青路面位移表现出非连续和不对称性,集料的运动位移、应力与压实荷位及其方向有关；压实区域与非压实区域集料的运动规律不同,在压实区域与非压实区域的过渡带集料运动方向形成了类似“涡流”状结构；压实区域材料内部以接触压力为主；外力做功和应变能在压实初期增加速率较大,后期逐渐变小；动能在初始阶段因压实应力未稳定导致集料运动速度较大发生异常,当进入稳定阶段后,动能减小. 该研究结果与前期成果基本一致,表明采用离散元法建立的路面压实模型分析沥青路面压实过程的细观行为是合理可行的,离散元法是研究沥青路面细观特征的重要工具. |
| 关键词: 离散元 路面压实 细观特性 集料运动 沥青混合料 |
| DOI：10.11918/j.issn.0367-6234.201708022 |
| 分类号:U416.2 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(8,2)； 广西高校中青年教师基础能力提升项目(2018KY0206) |
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| Mesoscopic characteristics of asphalt pavement during field compaction |
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LIU Weidong1,GAO Ying2,HUANG Xiaoming2,TIAN Bo3
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(1. School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China; 2. School of Transportation, Southeast University,Nanjing 210096, China; 3. Research Institute of Highway Ministry of Transport, Beijing 100088, China)
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| Abstract: |
| To analyze the micromechanical response of asphalt mixture during field compaction, a 3D compaction model was developed based on particle flow code in 3-dimensions (PFC3D) by considering the asphalt pavement properties and compaction temperature. The Burger’s model parameters were obtained by dynamic modulus test with time-temperature superposition (TTS) principle, and were used to describe the contact behavior between aggregate and asphalt. Micromechanical characteristics, such as aggregate migration and motion, evolution of contact force and energy were investigated during field compaction. Results showed that asphalt pavement displacement displayed non-continuity and asymmetry. Meanwhile, aggregate motion and stress were concerned with the load position and orientation of compaction load. The laws of aggregate motion in compacted areas were different from the non-compacted areas, and the analogous whirlpool condition was formed in the transitional zone of the compacted and non-compacted areas. Additionally, the compacted areas were mainly dominated by contact pressure. The work of external force and strain energy increased quickly at the initial stage of compaction, and gradually decreased at the later stage. Due to the unstabilized compaction stress that resulted in a faster speed, the kinetic energy developed abnormally. However, once the compaction model entered a stable stage, the kinetic energy decreased. These results agree with those of preliminary research. It is reasonable to conduct a survey of the microscopic behavior of asphalt mixture with discrete element method (DEM). The DEM can be employed to investigate micromechanical characteristics of asphalt mixture during filed compaction. |
| Key words: discrete element method pavement compaction mesoscopic characteristic aggregate motion asphalt mixture |
