高速公路胶粉沥青混合料疲劳损伤细观力学分析及试验研究
Micro Mechanical Analysis and Experiment on Fatigue Damage of Rubber Powder Asphalt Mixture of Expressway
李南鹏 1王国清 2王志斌 2张霞 3司春棣1
作者信息
- 1. 石家庄铁道大学 交通工程结构力学行为与系统安全国家重点实验室,河北 石家庄 050043
- 2. 河北雄安京德高速公路有限公司,河北 雄安 071000
- 3. 石家庄铁路职业技术学院 轨道交通系,河北 石家庄 050062
- 折叠
摘要
为探究重载车辆作用下高速公路胶粉沥青混合料(ARHM-20)面层的疲劳损伤机理及细观力学行为,该文基于离散元方法,构建混合料的三维细观结构模型,研究从集料运动到形成宏观永久变形的损伤机理.采用Burger's本构模型表征沥青砂浆的黏弹属性,通过沥青蠕变试验获取不同温度下Burger's模型的宏观力学参数,基于宏观与细观的转换公式得到细观建模参数;利用Solidworks软件制作不规则粗集料,使得模型更接近实际工况.该文采用分布加载方式,先让轮胎在地面滚动并提取与地面的接触力,随后将接触力施加在模型上.依据实际公路工程级配,制备车辙试验试件并进行室内车辙试验,验证三维细观结构模型的有效性和正确性.研究结果表明:离散元方法可用于研究沥青混合料的细观运动力学行为,车辙演化宏观行为主要是由沥青混合料内部粗集料的细观受力分布及运动演化产生,与未添加胶粉的沥青混合料相比,ARHM-20沥青混合料具有更好的高温抗疲劳能力.
Abstract
To explore the fatigue damage mechanism and micro-mechanical behavior of the pavement of rubber powder asphalt mixture(ARHM-20)of expressway influenced by heavy vehicles,a three-dimensional microstructural model of the mixture was built based on the discrete element method,and research on the damage mechanism from aggregate motion to macroscopic permanent deformation were conducted.The Burger's constitutive model was used to characterize the viscoelastic properties of asphalt mortar.The macro mechanical parameters of Burger's model at different temperatures were obtained through asphalt creep tests,and the micro modeling parameters were obtained based on the macro and micro conversion formulas.The irregular coarse aggregate was made by Solidworks software to make the model closer to the actual working conditions.In this paper,under the distributed loading method,the contact force was extracted after rolling the tire on the ground,and then the force was applied to the model.Based on the actual highway engineering gradation,the rutting test specimen was prepared and the laboratory rutting test was carried out to verify the validity and correctness of the three-dimensional microstructure model.The research results show that the discrete element method can be used to study the micro motion-mechanical behavior of asphalt mixture.The macro behavior of rutting evolution is mainly generated by the micro stress distribution and motion evolution of the coarse aggregate in the asphalt mixture.Compared with the asphalt mixture without rubber powder,the ARHM-20 asphalt mixture has better high-temperature fatigue resistance.
关键词
胶粉沥青混合料/离散元方法/细观力学行为/损伤演化机理Key words
rubber powder asphalt mixture/discrete element method/micromechanical behavior/damage evolution mechanism引用本文复制引用
基金项目
国家自然科学基金(12072205)
河北省交通厅科技项目(JD-202006)
河北省交通厅科技项目(JD-202007)
出版年
2024
国家科技期刊平台
NSTL
万方数据