Some experience and preliminary conclusions from the experimental monitoring of the temperature regime of a subgrade structure

Abstract

In addition to other topics on railway engineering, the Department of Railway Engineering and Track Management is permanently paying attention to the issue of the non-traffic load of railway track (track load of climatic impacts) for the purpose of verification and possible adjustments of the existing methodology of the railway subgrade structure design to the adverse effects of frost used on the Slovak railways. For this purpose, the model of a railway track structure was built -Experimental Stand DRETM I -with an inbuilt thermometer in its individual structural layers and their interfaces, connected to recording equipment. This paper presents the characterized results of individual winter periods observed since 2003, its partial analysis is made and it states some fundamental knowledge necessary to be taken into account in the design and assessment of the railway track structure to the adverse effects of frost. Based on the evaluation of experimental measurements and knowledge obtained so far, a draft design nomogram for the design of the structure of a railway track on a non-traffic load was made, which greatly simplifies this whole process of design and assessment, compared with the current methodology in TNŽ 73 6312 "The design of structural layers of subgrade structure".

Preliminary results and conclusions from mathematical modelling of thermal regime of railway track structure

“…The SoilVision software enables mathematical modelling of various combinations of material compositions of railway track structure after entering all the relevant input data. In this way, conditions for drawing up the relevant design nomograms for various types of subgrade structure or railway body types [1,[4][5][6] are created.…”

Comparison of the Dimensions Design Methodologies of the Railway Track Bed Structure According to Frost Effect in Slovakia and Lithuania

“…Deividas Navikas and in order maximally utilize available conditions for his scientific work on the doctoral dissertation thesis it has also been decided to confront the newfound information with foreign resources, whereas for the purpose of the particular comparison of the structure dimensions design methodology of TB methodology used at Lithuanian has been applied here. (Ižvolt, Dobeš, & Pitoňák, 2014)…”

Modelling of Railway Track Temperature Regime with Real Heat-Technical Values for Different Climatic Characteristics

“…The models are based on the built-in railway formation of the track in the "in-situ" DRETM laboratory [7] using SV-HEAT SoilVision [2]. The subbalast layers of the railway formation were modelled as the TYPE 2 of the railway subgrade with a protective gravel-sand layer under the track bed (the reason for its building-in is to increase its resistance to low freezing temperatures and also to improve the water regime of the layers).…”