考虑脏污材质的有砟道床力学行为及变形机理

Translated title of the contribution: Mechanical behavior and deformation mechanism of ballast bed with various fouling materials

Zhi hai Zhang, Hong Xiao*, Meng Wang, Guang peng Liu, Hao yu Wang

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

In order to study the interaction between various fouling particles and ballast, a multi-layer and multi-scale discrete element model (DEM) including the sleeper, ballast bed and the surface layer of subgrade was developed. Two typical fouling particles, the hard particles (sand) and soft ones (coal fines), are considered. A support stiffness test of the ballast bed under various fouling conditions was conducted to calibrate the microscopic parameters of the contact model. With the model, the influence of fouling particles on the mechanical behavior and deformation of the ballast bed was analyzed from macro and micro perspectives. The results show that the increase in the strength of the fouling particles enlarges the stiffness of the ballast bed. Hard particles increase the uniformity coefficient of the contact force bond γ of ballast by 50.4%. Fouling particles increase the average stress in the subgrade, soft particles by 2 kPa and hard particles by 1 kPa. Hard particles can reduce the elasticity, plastic deformation and energy dissipation in the track structure. As the fouling particle changes from hard to soft, the proportion of the settlement in ballast bed increases to 40.5% and surface layer of swbgrade settlement decreases to 59.5%. Thus, the influence of fouling particles should be considered carefully in railway design and maintenance.
Translated title of the contributionMechanical behavior and deformation mechanism of ballast bed with various fouling materials
Original languageChinese (Traditional)
Pages (from-to)2857-2874
Number of pages18
JournalJournal of Central South University
Volume28
Issue number9
DOIs
Publication statusPublished - 2021

Keywords

  • ballasted track
  • contact force bond
  • discrete element method
  • elastic-plastic deformation
  • fouling material

Fingerprint

Dive into the research topics of 'Mechanical behavior and deformation mechanism of ballast bed with various fouling materials'. Together they form a unique fingerprint.

Cite this