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Determination of fouling level change in the railway ballast layer during machine cleaning process by measuring changes of relative permittivity using GPR technology

Autoři: Borkovcová Anna | Borecký Vladislav | Artagan Salih | Ševčík Filip

Rok: 2019

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Determination of fouling level change in the railway ballast layer during machine cleaning process by measuring changes of relative permittivity using GPR technology	Railway, as one of the most used mode of transportation, requires high demands on its maintenance. Thismaintenance should be performed on the basis of comprehensive and accurate diagnostics. Current diagnosticmethods require high costs associated with their destructive nature as well as financial losses caused by trafficconstraints and related complications. Railway infrastructure managers aim at the reduction in the time ofdiagnosis and subsequent repairs, in order to minimize the financial costs associated with it. For these reasons,Ground Penetrating Radar (GPR) as a relatively new, non-destructive tool for diagnostics of the railway body,is being used recently. This technology is still not the most typical way to control the state of the railway body(ballast and sub-ballast layers), but it is gradually being applied because of its various advantages, such as thespeed of diagnostics, the possibility of continual measurement of large sections, non-destructive nature andachievable depths.Upon cyclic loading of trains and through weathering processes, railway track ballast deteriorates by time. Ballastfouling, i.e. contamination of ballast takes place when voids in the ballast are filled because of ballast breakdownand infiltration of other materials from the ballast surface or infiltration from the base of the ballast layer. Toremove debris and dirt from spent ballast, machines called ballast cleaners and/or undercutters are commonlyused. These devices perform continuous cleaning of the existing worn-out materials with the possible addition ofnew fresh ballast. This essential process, followed by tamping, is both costly and time-consuming, therefore it isnecessary to accurately determine at what stage of track ballast life cycle, and degree of pollution, this activity isneeded and most economically advantageous. To obtain this information, a long-term and repeated monitoring ofthe track ballast condition is necessary to carry out.In the present study, a series of i	GPR;railway ballast;relative permitivity;fouling

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