Morphological reconstruction method of irregular shaped ballast particles and application in numerical simulation of ballasted track

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00356788" target="_blank" >RIV/68407700:21110/20:00356788 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.trgeo.2020.100374" target="_blank" >https://doi.org/10.1016/j.trgeo.2020.100374</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.trgeo.2020.100374" target="_blank" >10.1016/j.trgeo.2020.100374</a>

Result language

angličtina

Original language name

Morphological reconstruction method of irregular shaped ballast particles and application in numerical simulation of ballasted track

Original language description

To quantitatively investigate the morphological features of railway ballast, a new statistical index, Curvature Index (CI), was presented. With a set of 584 digitized railway ballast particles obtained through 3D scanning, the statistical distribution functions of CI and existing global shape indices (i.e., long axis, middle axis, short axis and sphericity index) were obtained. Then, based on Proper Orthogonal Decomposition (POD) and Radial Basis Function (RBF) Neural Network, a new shape reconstruction method was proposed to generate an arbitrary number of ballast particles that met the desired probability density distribution of morphological indices. And based on local curvature distribution on particle surface, a new simplification algorithm was implemented to reduce the number of contour points of each particle to no more than 31 on the premise of preserving global and local morphological features, which improved the efficiency of numerical simulations. These methods were used to reconstruct and simplify the arbitrary shapes of gravel ballast particles. Then, a DEM-FEM coupling model of ballasted track-subgrade was established by applying the regenerated ballast particles to analyze the contact stress at the ballast-soil interface. The numerical simulations can effectively reflect the contact stress distributions resulted from laboratory tests, which further confirmed that the reconstruction of the ballast particles reflected the morphological characteristics of real ballast.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20104 - Transport engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Transportation geotechnics

ISSN

2214-3912

e-ISSN

2214-3912

Volume of the periodical

24

Issue of the periodical within the volume

September

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

12

Pages from-to

1-12

UT code for WoS article

000559177200006

EID of the result in the Scopus database

2-s2.0-85085755974