Scholarlink

<p>This study investigates the impact of freezing on the dynamic characteristics of ballast track through a standard-compliant discrete element modeling (DEM). The vibration response of ballast at different positions under cyclic loading is analyzed. And the mechanism behind the increased stiffness of the ballast track under freezing conditions is explained by calculating the ballast’s rotational and translational kinetic energy. The research results indicate that freezing alters the vibration response amplitude of ballast particles, with the vertical vibration displacement amplitude of the sleeper decreasing by 50%. Under freezing conditions, the plastic deformation of the ballast track under vehicle load is relatively small, approximately 1/15 of that in the unfrozen state. Unlike the trapezoidal attenuation of displacement amplitude in the unfroze ballast track, the influence of the frozen ballast spread downward in a rectangular pattern. Under the vehicle load, the vertical compressive stress in the frozen ballast bed increases by up to 10.96&#xa0;kPa, approximately half of that in the unfrozen ballast bed. Therefore, the ballast’s ability to distribute the train load is reduced under the frozen condition. The frozen ballast track restricts the relative movement of ballast particles, with both translational and rotational kinetic energies of the ballast in the frozen ballast track being lower than in unfrozen conditions, thus exhibiting characteristics of increased stiffness and reduced elasticity.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Dynamic Analysis of Freezing Railway Ballast Using the Discrete Element Method

  • 期刊论文

  • 发表日期：

    2025年1月3日

查看全文
  • Wenrui Bian,
  • Yundong Ma,
  • Zhongchang Wang

摘要

This study investigates the impact of freezing on the dynamic characteristics of ballast track through a standard-compliant discrete element modeling (DEM). The vibration response of ballast at different positions under cyclic loading is analyzed. And the mechanism behind the increased stiffness of the ballast track under freezing conditions is explained by calculating the ballast’s rotational and translational kinetic energy. The research results indicate that freezing alters the vibration response amplitude of ballast particles, with the vertical vibration displacement amplitude of the sleeper decreasing by 50%. Under freezing conditions, the plastic deformation of the ballast track under vehicle load is relatively small, approximately 1/15 of that in the unfrozen state. Unlike the trapezoidal attenuation of displacement amplitude in the unfroze ballast track, the influence of the frozen ballast spread downward in a rectangular pattern. Under the vehicle load, the vertical compressive stress in the frozen ballast bed increases by up to 10.96 kPa, approximately half of that in the unfrozen ballast bed. Therefore, the ballast’s ability to distribute the train load is reduced under the frozen condition. The frozen ballast track restricts the relative movement of ballast particles, with both translational and rotational kinetic energies of the ballast in the frozen ballast track being lower than in unfrozen conditions, thus exhibiting characteristics of increased stiffness and reduced elasticity.