Discrete element modelling of railway ballast under monotonic and cyclic triaxial loading

Géotechnique ◽  
2010 ◽  
Vol 60 (6) ◽  
pp. 459-467 ◽  
Author(s):  
M. LU ◽  
G.R. McDOWELL
Keyword(s):  
Discrete Element ◽  
Discrete Element Modelling ◽  
Railway Ballast ◽  
Cyclic Triaxial ◽  
Triaxial Loading ◽  
Element Modelling

Discrete element modelling of railway ballast

2005 ◽  
Vol 7 (1) ◽  
pp. 19-29 ◽  
Author(s):  
W. L. Lim ◽  
G. R. McDowell
Keyword(s):  
Discrete Element ◽  
Discrete Element Modelling ◽  
Railway Ballast ◽  
Element Modelling

Calibration for discrete element modelling of railway ballast: A review

2020 ◽  
Vol 23 ◽  
pp. 100341 ◽  
Author(s):  
Yunlong Guo ◽  
Chunfa Zhao ◽  
Valeri Markine ◽  
Guoqing Jing ◽  
Wanming Zhai
Keyword(s):  
Discrete Element ◽  
Discrete Element Modelling ◽  
Railway Ballast ◽  
Element Modelling

scholarly journals Tutorial on the fragmentation of the railway ballast particles and calibration methods in discrete element modelling

2021 ◽  
Author(s):  
Erika Juhász ◽  
Szabolcs Fischer
Keyword(s):  
Model Building ◽  
Computer Software ◽  
Discrete Element ◽  
Discrete Element Modelling ◽  
Railway Ballast ◽  
Element Modelling ◽  
Current State ◽  
Calibration Methods ◽  
The Subject ◽  
Insight Into

This paper presents a short literature review related to the fragmentation of the railway crushed ballast particles. With the help of the processed articles with the main topic of discrete element modelling (DEM) we aim to provide some insight into the international achievements and forward progress of the subject. Rock materials as granular elements can be investigated from several perspectives. The elements can be examined in laboratory conditions purely from the quarry, or even by obtaining already fragmented particles from the real railway tracks. In addition, DEM models can be created by using computer software. This article tackles only a small segment of the literature. Though each DEM topic was unique, they all involved examination of degradation of particles in some way. This review focuses on model building, including particle construction and calibration. The selected publications do not cover the current state of the entire DEM research related to ballast degradation.

scholarly journals A new time-delayed periodic boundary condition for discrete element modelling of railway track under moving wheel loads

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Huiqi Li ◽  
Glenn McDowell ◽  
John de Bono
Keyword(s):  
Boundary Condition ◽  
Periodic Boundary Condition ◽  
Periodic Boundary ◽  
Discrete Element ◽  
Contact Forces ◽  
Railway Track ◽  
Discrete Element Modelling ◽  
Fixed Boundary ◽  
Element Modelling ◽  
New Time

Abstract A new time-delayed periodic boundary condition (PBC) has been proposed for discrete element modelling (DEM) of periodic structures subject to moving loads such as railway track based on a box test which is normally used as an element testing model. The new proposed time-delayed PBC is approached by predicting forces acting on ghost particles with the consideration of different loading phases for adjacent sleepers whereas a normal PBC simply gives the ghost particles the same contact forces as the original particles. By comparing the sleeper in a single sleeper test with a fixed boundary, a normal periodic boundary and the newly proposed time-delayed PBC (TDPBC), the new TDPBC was found to produce the closest settlement to that of the middle sleeper in a three-sleeper test which was assumed to be free of boundary effects. It appears that the new TDPBC can eliminate the boundary effect more effectively than either a fixed boundary or a normal periodic cell. Graphic abstract

Discrete element modelling of track ballast capturing the true shape of ballast stones

2021 ◽  
Vol 386 ◽  
pp. 144-153
Author(s):  
Jacob Mortensen ◽  
Joachim Faldt Faurholt ◽  
Emil Hovad ◽  
Jens Honoré Walther
Keyword(s):  
Discrete Element ◽  
Discrete Element Modelling ◽  
Element Modelling ◽  
True Shape
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