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Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:铁道学报

Affiliation of Author(s):物理学院

Issue:11

Page Number:89-95

ISSN No.:1001-8360

Abstract:Based on the Minkowski Sum method,this paper introduced dilated polyhedral element to describe the irregular geometry of ballast particles and conducted discrete element analysis on the dynamic characteris-tics of ballast material under cyclic loading to study the evolution of the settlement and deformation stiffness of ballast material.The results showed that the accumulative settlement of ballast material under cyclic loading increased significantly at the early stage of deformation and then tended to be stable with the increase of the fre-quency of cyclic loading.Meanwhile,the effective stiffness during the accumulative deformation process of bal-last material also increased continuously and eventually became stable.Thus,this dilated polyhedral element can model the mechanic behaviors of ballast material effectively and reveal its dynamic characteristics under cy-clic loading of train.

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