Utilizing a pressure paper for the determination of contact parameters between aggregate and a railway sleeper

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F19%3A00332934" target="_blank" >RIV/68407700:21110/19:00332934 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sgem.org" target="_blank" >https://www.sgem.org</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5593/sgem2019/1.2/S02.072" target="_blank" >10.5593/sgem2019/1.2/S02.072</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Utilizing a pressure paper for the determination of contact parameters between aggregate and a railway sleeper

Popis výsledku v původním jazyce

This paper focuses on the transmission of loads imposed by passing trains to railway aggregates utilizing a pressure paper method, which enables the quantification of contact parameters on the interface between the railway sleeper bottom and railway ballast. The contact parameters between the sleeper soffit and crushed stone influence the lateral track stability and the ballast wear and thus the aggregates service life. The main parameters are the indentation of grains on the sleeper surface and the contact area and the pressure between the sleeper and the grains. The load distribution transmitted to the ballast bed relies on the sleeper bending stiffness depending on the sleeper structure and applied material. Utilizing pre-stressed concrete, impregnated wood or polymers representing the state of the art among the materials used in the production of railway sleepers, the sleeper stiffness varies as well as the sleeper surface hardness. In this research, ultrathin polyester-based pressure paper with microcapsules developing a red colour agent when applying specific pressure was used between the sleeper soffit and the ballast bed to determine the contact parameters. The laboratory test focused on the most loaded part of the sleeper, the sleeper rail seat. The test was conducted on samples prepared as sleeper sections. The static force reflecting the traffic resembling the load acting on the sleeper samples was calculated using typical linear formulas. A standardized geometric ballast plate made of steel was used for modelling the track bed aggregates at the rail seat. A wide selection of samples prepared from sleepers of a different material and structural basis showed different performances from the perspective of contact parameters on the sleepers soffit. The performed test provided enough data for developing a follow-up, full-scale laboratory test with the whole sleeper body in a laboratory ballast box filled with aggregates.

Název v anglickém jazyce

Utilizing a pressure paper for the determination of contact parameters between aggregate and a railway sleeper

Popis výsledku anglicky

This paper focuses on the transmission of loads imposed by passing trains to railway aggregates utilizing a pressure paper method, which enables the quantification of contact parameters on the interface between the railway sleeper bottom and railway ballast. The contact parameters between the sleeper soffit and crushed stone influence the lateral track stability and the ballast wear and thus the aggregates service life. The main parameters are the indentation of grains on the sleeper surface and the contact area and the pressure between the sleeper and the grains. The load distribution transmitted to the ballast bed relies on the sleeper bending stiffness depending on the sleeper structure and applied material. Utilizing pre-stressed concrete, impregnated wood or polymers representing the state of the art among the materials used in the production of railway sleepers, the sleeper stiffness varies as well as the sleeper surface hardness. In this research, ultrathin polyester-based pressure paper with microcapsules developing a red colour agent when applying specific pressure was used between the sleeper soffit and the ballast bed to determine the contact parameters. The laboratory test focused on the most loaded part of the sleeper, the sleeper rail seat. The test was conducted on samples prepared as sleeper sections. The static force reflecting the traffic resembling the load acting on the sleeper samples was calculated using typical linear formulas. A standardized geometric ballast plate made of steel was used for modelling the track bed aggregates at the rail seat. A wide selection of samples prepared from sleepers of a different material and structural basis showed different performances from the perspective of contact parameters on the sleepers soffit. The performed test provided enough data for developing a follow-up, full-scale laboratory test with the whole sleeper body in a laboratory ballast box filled with aggregates.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

19th International Multidisciplinary Scientific Geoconference SGEM 2019

ISBN

978-619-7408-77-5

ISSN

1314-2704

e-ISSN

—

Počet stran výsledku

7

Strana od-do

565-571

Název nakladatele

STEF92 Technology Ltd.

Místo vydání

Sofia

Místo konání akce

Albena

Datum konání akce

30. 6. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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