Numerical modelling of thermal regime of railway track - structure with thermal insulation (Styrodur)

Journal of Civil Engineering and Management

Deividas Navikas¹  Peter Dobeš²  Libor Ižvolt²  Michaela Holešová³ 

[1] Department of Mobile Machinery and Railway Transport, Vilnius Gediminas Technical University, Vilnius, Lithuania;Department of Railway Engineering and Track Management, Univesity of Žilina, Žilina, Slovakia;Department of Structural Mechanics and Applied Mathematics, Univesity of Žilina, Žilina, Slovakia;

关键词: railway track;    non-traffic railway track loading;    freezing of the railway track structure;    sub-ballast layer dimensioning;    thermal insulation layer;    extruded polystyrene;    thickness of protective layer;   

DOI  :  10.3846/jcem.2021.14903

来源: DOAJ

【 摘 要 】

This paper presents the results of numerical modelling of the influence of various factors (geometrical layout of the structural layers of the railway track, climatic factors and ballast fouling) on the freezing of railway track structure with a built-in thermal insulation layer of extruded polystyrene (Styrodur). At the same time, the suitability and expediency of incorporating the thermal insulation layer at the sub-ballast upper surface level (i.e. below the rail ballast construction layer), or at the level of subgrade surface are discussed. Numerical modelling results in the main factors that should be taken into account in the dimensioning of the sub-ballast layers with a built-in thermal insulation layer. Based on the data on the depth of freezing of the railway track structure obtained from numerical modelling, a design nomogram for dimensioning was created and subsequently the influence of the changes of climatic characteristics on the freezing of the railway track structure was then mathematically expressed.

【 授权许可】

Unknown