Numerical Modelling of Thermal Regime of Railway Track - Structure With Thermal Insulation (Styrodur)

Ižvolt, Libor; Dobeš, Peter; Holešová, Michaela; Navikas, Deividas

doi:10.3846/jcem.2021.14903

Cited by 6 publications

(17 citation statements)

References 20 publications

(15 reference statements)

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“…The difference between the values determined by the experimental and numerical methods is 0.002 m, which is a negligible difference with respect to the methodology of design of the structural sub-ballast layers of the railway line [ 100 ]. Moreover, the obtained accuracy of recreating the measurement results in the numerical model is the same as for other railway track substructure–subsoil systems [ 7 ] and consistent with previous observations [ 109 ]. Therefore, the model can be considered validated.…”

Section: Resultssupporting

confidence: 85%

“…The obtained temperature for the greatest freezing depth of the structural layers of the railway line achieved (5 March 2018; TIME = 429 day) was lower than for railway substructure solution with XPS layer (28 January 2019; TIME = 393 day) [ 7 ], but this is because in this study, the daily temperatures were lower (in this study, it was −1.1 °C, while Ižvolt et al [ 7 ] assumed −0.4 °C). Another aspect is that, in this study, a high thermal conductivity coefficient was adopted for foam concrete compared to XPS [ 7 ], but it was caused by taking into account the actual ground conditions (moisture in the ground) and thus higher values of the thermal conductivity coefficient. The influence of humidity on the thermal conductivity coefficient of foam concrete is the subject of the present authors’ research.…”

Section: Resultsmentioning

confidence: 99%

“…The structural and geometrical arrangement of the experimental field as well as the material composition of the individual structural layers of the modified sub-ballast layers are evident from Figure 3 . The experimental field with its structural and geometric arrangement follows the experimental field characterized in [ 7 , 11 ], where extruded polystyrene with the trade mark Styrodur 2800C (BASF SE, Ludwigshafen, Germany) was applied in the structural composition of the sub-ballast layers. However, it has been shown that extruded polystyrene has a negligible effect on increasing the bearing capacity of the sub-ballast layers.…”

Section: Characteristics Of Tested Materials and Used Methodsmentioning

confidence: 99%

“…Ensuring reliable and safe tracks for railways (especially for high-speed railways) requires components of the railway superstructure and substructure with sufficiently high resistance to deformation [ 3 ], which can be caused by traffic load (static and dynamic load [ 4 , 5 , 6 ]) and non-traffic load (climate load—water, frost, snow, etc. [ 7 ]). At present, as thermal insulation or reinforcement materials in sub-ballast or sub-base layers can be used various polymer materials e.g., expanded polystyrene (EPS) [ 8 ], polyurethane [ 9 ], extruded polystyrene (styrodur) [ 10 , 11 , 12 ], artificial aggregates, liapor with foam glass [ 13 , 14 ], and geosynthetic materials (geogrids, geo-mattresses) [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…The layer of composite FC will be used to ensure sufficient bearing capacity and thermal resistance of the railway substructure, while the extruded polystyrene plates to ensure protection of the subgrade against freezing from track bench and from the slope side of the embankment. In the earlier research [ 7 , 11 ], authors determined that the application of extruded polystyrene railway sub-ballast layers increased the thermal resistance and had a negligible benefit for increasing the bearing capacity of sub-ballast layers. Thus, its combination with a layer of composite FC appears to be suitable and beneficial.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Verification of the Railway Track Substructure with Innovative Thermal Insulation Materials

et al. 2021

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The article aims to present the modified structural composition of the sub-ballast layers of the railway substructure, in which a part of the natural materials for the establishment of sub-ballast or protective layers of crushed aggregate is replaced by thermal insulation and reinforcing material (layer of composite foamed concrete and extruded polystyrene board). In this purpose, the experimental field test was constructed and the bearing capacity of the modified sub-ballast layers’ structure and temperature parameters were analyzed. A significant increase in the original static modulus of deformation on the surface of composite foamed concrete was obtained (3.5 times and 18 times for weaker and strengthen subsoil, respectively). Based on real temperature measurement, it was determined the high consistency of the results of numerical analyses and experimental test (0.002 m for the maximum freezing depth of the railway line layers and maximum ±0.5 °C for temperature in the railway track substructure–subsoil system). Based on results of numerical analyses, modified railway substructure with built-in thermal insulating extruded materials (foamed concrete and extruded polystyrene) were considered. A nomogram for the implementation of the design of thicknesses of individual structural layers of a modified railway sub-ballast layers dependent on climate load, and a mathematical model suitable for the design of thicknesses of structural sub-ballast layers of railway line were created.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Characteristics Of Tested Materials and Used Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental and Numerical Verification of the Railway Track Substructure with Innovative Thermal Insulation Materials

et al. 2021

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Kinematic running resistance of an urban rail vehicle undercarriage: a study of the impact of wheel design

Semenov

Mikhailov

Kovtanets

et al. 2023

Sci Rep

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Urban railway vehicles are important means of transport in towns and cities due to their high capacity, power source, and low running resistance, which make them efficient for operation. Although these properties are considered advantages, there is still room for improvement in their operational efficiency. The main objective of this article is to investigate the impact of railway wheel design on the level of kinematic running resistance, which is expressed as the amount of mechanical energy losses during the interaction of wheels with rails. This research focuses on simulation computations of two variants of wheel design schemes: the traditional design scheme (TKS) and a perspective design scheme (PKS) characterized by a rotating flange independently of the wheel tread surface. Two undercarriage multibody models have been created, one with TKS and one with PKS, and simulation computations have been performed for running speeds of 10 km/h, 20 km/h, 30 km/h, and 40 km/h on track models in curves with radii of 20, 50, 100, 150, 200, and 250 m. The evaluated indicators affecting the level of mechanical energy losses were creep forces, slip velocities, and average power. The most important findings of this study are that the PKS design scheme resulted in lower values of all assessed parameters.

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Experimental Verification of Modified Sub-Ballast Layers, Application of Foam Glass Boards

Dobeš

Ižvolt

Mečár

2022

Civil and Environmental Engineering

Self Cite

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Glass waste decomposition time in landfills or the countryside can exceed several millennia. Recycling and finding new uses for municipal waste, where glass accounts for approx. 10 % of the volume, is therefore essential to ensure the sustainable development of society. A novel method of reusing glass waste is to produce a thermal insulation material called foam glass in the form of boards. The manufacturer characterises the foam glass boards as having extreme compressive strength and being suitable for highly loaded building structures. The Department of Railway Engineering and Track Management (DRETM) has been long-term researching the possibility of applying various thermal insulation materials (composite foam concrete, Liapor concrete, extruded polystyrene boards) to the sub-ballast layers. For the above reasons, an experimental field was constructed to validation a modified design of the sub-ballast layers with embedded foam glass boards. The paper’s objective was to verify whether the modified composition of the sub-ballast layers affects the increase of its deformation resistance. The assessment of the deformation resistance of the sub-ballast layers of the modified and standard construction was performed by a series of static load tests in the particular structural layers.

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Numerical Modelling of Thermal Regime of Railway Track - Structure With Thermal Insulation (Styrodur)

Cited by 6 publications

References 20 publications

Experimental and Numerical Verification of the Railway Track Substructure with Innovative Thermal Insulation Materials

Experimental and Numerical Verification of the Railway Track Substructure with Innovative Thermal Insulation Materials

Kinematic running resistance of an urban rail vehicle undercarriage: a study of the impact of wheel design

Experimental Verification of Modified Sub-Ballast Layers, Application of Foam Glass Boards

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