DEM Simulation of Triaxial Tests of Railway Ballast Fouled with Desert Sand

Jiménez, Pablo and Estaire, José and Zamorano Martín, Clara and Benito, Alejandro de and Gonzalez Tejada, Ignacio (2019). DEM Simulation of Triaxial Tests of Railway Ballast Fouled with Desert Sand. In: "VI International Conference on Particle-Based Methods. Fundamentals and Applications PARTICLES 2019", 28-30 October, 2019, Barcelona, Spain. ISBN 978-84-121101-1-1. pp. 250-259.

Description

Title: DEM Simulation of Triaxial Tests of Railway Ballast Fouled with Desert Sand
Author/s:
  • Jiménez, Pablo
  • Estaire, José
  • Zamorano Martín, Clara
  • Benito, Alejandro de
  • Gonzalez Tejada, Ignacio
Item Type: Presentation at Congress or Conference (Other)
Event Title: VI International Conference on Particle-Based Methods. Fundamentals and Applications PARTICLES 2019
Event Dates: 28-30 October, 2019
Event Location: Barcelona, Spain
Title of Book: Proceedings of the VI International Conference on Particle-Based Methods. Fundamentals and Applications PARTICLES 2019
Date: October 2019
ISBN: 978-84-121101-1-1
Subjects:
Freetext Keywords: Railway Ballast, DEM
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería y Morfología del Terreno
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Some high-speed rail lines go through desert zones where sand particles transported by winds may foul track ballast layers. This fouling can be troublesome since it increases the stiffness of the layer and reduces its capacity to absorb vibrations from the rolling stock. We are studying this phenomenon through both laboratory and numerical experiments. In the laboratory, we performed two kinds of experiments: 9 inches triaxial tests and physical modelling in the CEDEX Track Box testing facility. The latter is a unique 1:1 model of railway track section (of dimensions 21 m ×5 m ×4 m) that has been built to model high-speed rail lines (with passenger and freight trains passing at velocities of up to 400 km/h). The laboratory experiments allowed us to measure the change of stiffness with the fouling level (represented through the void contaminant index, VCI). Numerical simulations are being performed with the Discrete Element Method, reproducing drained triaxial test conditions. Due to the considerable different size of railway ballast and sand grains, we are using idealized packings of spherical particles to study this phenomenon. We are paying particular attention to the sample size effects and are registering the evolution of the stiffness with the fouling level up to high values of VCI. The results obtained from these idealized systems will be contrasted to the laboratory experiments carried out with real railway ballast and sand.

More information

Item ID: 67863
DC Identifier: https://oa.upm.es/67863/
OAI Identifier: oai:oa.upm.es:67863
Official URL: https://congress.cimne.com/particles2019/frontal/doc/Ebook_Particles_2019.pdf
Deposited by: Memoria Investigacion
Deposited on: 21 Sep 2021 14:41
Last Modified: 21 Sep 2021 14:41
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