吉林大学学报(工学版) ›› 2021, Vol. 51 ›› Issue (3): 956-964.doi: 10.13229/j.cnki.jdxbgxb20200154
Yong PENG1(),Han-duo YANG1,Xue-yuan LU2,Yan-wei LI3,4
摘要:
基于图像技术和三维离散元法,建立了具有真实空隙大小和分布以及随机空隙大小和分布的沥青混合料剪切疲劳微观力学模型,通过模拟不同集料粒径、用油量以及温度下的沥青混合料剪切疲劳寿命,研究了空隙分布特征对沥青混合料虚拟剪切疲劳寿命的影响,并将部分模拟结果与试验结果进行对比。结果表明:基于三维离散元法可以模拟沥青混合料剪切疲劳寿命,空隙特征对沥青混合料虚拟剪切疲劳寿命有较大影响。在相同模型参数条件下,具有真实空隙大小和分布的沥青混合料剪切疲劳寿命小于具有随机空隙大小和分布的沥青混合料剪切疲劳寿命,但与试验结果更为接近。此外,集料粒径和用油量也对沥青混合料剪切疲劳寿命有着显著影响。沥青混合料剪切疲劳寿命随集料粒径的增大而提高;在相同集料级配和试验温度时,在最佳用油量条件下的沥青混合料剪切疲劳寿命最大;在相同的集料级配和用油量时,沥青混合料剪切疲劳寿命随温度的升高而降低。
中图分类号:
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