李世恩,王学军,姚星

• 1:昆明理工大学机电工程学院

摘要(Abstract)：

为解决道砟数值模型形态还原度不足、破碎响应模拟与真实情况偏差较大，且道砟模型精度缺乏量化标准的问题，提出一种几何形态与破碎行为均贴合真实道砟的精细道砟建模方法。在PFC中建立由刚性子块体黏接而成的黏结块道砟模型，基于道砟宏观形态与棱角度特征，提出模型精度量化方法，通过分析建模参数对道砟模型精度的影响划定合理参数范围，确定建模核心参数，并借助单轴压缩离散元仿真验证模型。结果表明：所建立的黏结块道砟模型可以较好地还原真实道砟的包括棱角在内的几何形态；道砟模型精度量化考虑了道砟宏观形态精度、道砟二维轮廓面积重合度以及棱角度等指标，当子块体相对最小尺寸R_s为0.2、相对最大尺寸R_b为0.5且接触腐蚀因子η为0.02时，道砟模型精度基本能达到95%且可平衡道砟模型精度与计算效率；单轴压缩仿真中，道砟模型的力-位移曲线特征、破碎形式均与真实试验高度吻合，并从细观角度分析了道砟破碎的演化过程；相较于传统球簇道砟模型，黏结块道砟模型能更准确地还原道砟的单点接触、应力集中及裂纹扩展。为道砟的精细建模提供了新思路。

关键词(KeyWords)： 道砟建模;黏结块道砟模型;精度量化;棱角度;道砟破碎

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52665012;52165013,51565021)

作者(Author): 李世恩,王学军,姚星

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