Verification of boundary conditions of numerical modeling of the track substructure thermal regime – influence of the snow cover

• Autorzy: Ižvolt L. , Dobeš P. , Pieš J.

Identyfikatory

DOI

10.5604/01.3001.0012.8365

• Języki publikacji: EN

Abstrakty

EN

The initial part of the paper briefly characterizes a long-term experimental activity at the Department of Railway Engineering and Track Management (DRETM). The research of the DRETM focuses, besides other research activities and specific problems in the field of railway engineering (application of new structures and construction materials in conventional and modernized railway tracks, modernisation and rehabilitation of existing railway tracks for higher speeds, track diagnostics, influence of track operation on noise emissions and design of structural measures, possibility of application of recycled ballast bed material in the track substructure, ballast recycling technologies, ecological assessment of recycled material of the track substructure), on various factors affecting track substructure freezing. In 2012-2017, in the campus of the University of Žilina (UNIZA), an Experimental stand DRETM was built for the research purposes. The experimental stand DRETM consists of 6 types of track substructure placed in an embankment or a cut, in the 1:1 scale. Besides conventional building materials (crushed aggregate), these structures also include various thermal insulation materials (Liapor concrete, Styrodur, foam concrete). A significant part of the paper deals with numerical modeling of the freezing process of track substructure (an embankment with the embedded protective layer of crushed aggregate, fr. 0/31.5 mm) for various boundary conditions (air frost index, average annual air temperature), using SoilVision software. The aim of this research is to identify the thermal insulation effects of different thicknesses of snow cover on the depth of penetration of the zero isotherm into the track substructure (railway track). The paper conclusion specifies the influence of different snow cover thicknesses, or nf factor (factor expressing the dependency between the mean daily air temperature and the temperature on the ballast bed surface) and various climatic conditions (frost indexes and average annual air temperatures), affecting the railway infrastructure, on the resulting depth of freezing of the track substructure (railway track). These outputs will be in the further research used for the design of nomogram for determining the thickness of the protective layer of the frost-susceptible subgrade surface of the track substructure.

Słowa kluczowe

EN

railway track substructure; track substructure freezing; frost index; snow cover thickne

PL

tory kolejowe; podtorze; zamrożenie podtorza; grubość pokrywy śnieżnej

• Wydawca: Warsaw University of Technology, Faculty of Transport
• Czasopismo: Archives of Transport
• Rocznik: 2018
• Tom: Vol. 48, iss. 4
• Strony: 51--60
• Opis fizyczny: Bibliogr. 22 poz., rys., tab., wykr.

Twórcy

autor

Ižvolt L.

• University of Žilina, Faculty of Civil Engineering, Department of Railway Engineering and Track Management, Žilina, Slovakia

autor

Dobeš P.

• University of Žilina, Faculty of Civil Engineering, Department of Railway Engineering and Track Management, Žilina, Slovakia

autor

Pieš J.

• University of Žilina, Faculty of Civil Engineering, Department of Railway Engineering and Track Management, Žilina, Slovakia

Bibliografia

• [1] AKROUCH, G. A., BRIAUD, J. L., SANCHEZ, M. & YILMAZ, R., 2016. Thermal Cone Test to Determine Soil Thermal Properties. Journal of Geotechnical and Geoenvironmental Engineering. 142 (3).
• [2] FARBROT, H., ISAKSEN, K., ETZELMÜLLER, B. & GISNÅS, K., 2013. Ground Thermal Regime and Permafrost Distribution under a Changing Climate in Northern Norway. Permafrost and Periglacial Processes. 24 (1), 20-38.
• [3] FREDLUND, M., 2011. SoilVision. A knowledge-based soils database. Canada: SoilVision Systems Ltd.
• [4] HANSSON, K., SIMUNEK, J., MIZOGUCHI, M., et al, 2004. Water flow and heat transfer in frozen soils. Numerical solution and freeze-thaw applications. In Vadose Zone Journal. 3. 693-704.
• [5] IŽVOLT, L., 2008. Railway substructure – stress, diagnostics, design and implementation of body construction layers of railway subgrade. University of Žilina. Slovakia .
• [6] IŽVOLT, L., KUPČULIAK, P. & PULTZNEROVÁ, A., 2013. Monitoring of the temperature regime and thermotechnical properties of railway subgrade materials. In Scientific Journal of Silesian University of Technology. Series Transport, 80, 41-52.
• [7] IŽVOLT, L. & DOBEŠ, P., 2014. Test procedure impact for the values of specific heat capacity and thermal conductivity coefficient. In 23th Russian - Polish - Slovak seminar. Theoretical Foundation of Civil Engineering, Wroclaw, Poland. 91. 453-458.
• [8] IŽVOLT, L., DOBEŠ, P. & PITOŇÁK, M., 2014. Some experience and preliminary conclusions from the experimental monitoring of the temperature regime of subgrade structure. In 14th International Conference on Railway Engineering Design & Operation, Rome, Italy. 135. 267-278.
• [9] IŽVOLT, L. & DOBEŠ, P., 2015. Experimental monitoring of moisture changes in railway track structure. In TRANSCOM 2015. In 11th international scientific conference of young scientists and Ph.D. students. Universtity of Žilina, Žilina, Slovakia. 46-51.
• [10] IŽVOLT, L., DOBEŠ, P. & PULTZNEROVÁ, A., 2016. Monitoring of moisture changes in the construction layers of the railway substructure body and its subgrade. In Procedia Engineering. 161. 1049-1056.
• [11] IŽVOLT, L., DOBEŠ, P. & PIEŠ, J., 2018. Updating the design map of frost indexes as a prerequisite for relevant assessment of track substructure for non-traffic load. Civil and environmental engineering. 14 (2) (in press).
• [12] IŽVOLT, L., DOBEŠ, P. & PIEŠ, J., 2018. Contribution to the modification of input data of subgrade structure dimensioning for non-traffic load according to the ŽSR methodology. In 16th International Conference on Railway Engineering Design & Operation, Lisabon, Portugal (in press).
• [13] NASSAR, I. N., HORTON, R. & FLERCHINGER, G. N., 2000. Simultaneous Heat and Mass Transfer in Soil Columns Exposed to Freezing/Thawing Conditions. Soil Science. 165 (3). 208-216.
• [14] NEWMAN, G. P., 1995. Heat and mass transfer in unsaturated soils during freezing. M. Sc Thesis, University of Saskatchewan, Canada.
• [15] OTTAVIANI, M., VAN DIEDENHOVEN, B. & CAIRNS, B., 2015. Photopolarimetric retrievals of snow properties. The Criosphere. 9. 1933-1942.
• [16] PANTELEEV, I., KOSTINA, A., ZHELNIN, M., PLEKHOV, A. & LEVIN, L., 2017. Intellectual monitoring of artificial ground freezing in the fluid-saturated rock mass. Procedia Structural Integrity. 5. 492-499.
• [17] PENTLAND, J. S., 2000. Use of a general partial differential equation solver for solution of heat and mass transfer problems in soils. University of Saskatchewan, Canada.
• [18] SUSSMANN, T. R. & HYSLIP, J. P., 2010. Track Substructure Design Methodology and Data. In Proceedings of the ASME Joint Rail Conference, Illinois, USA.
• [19] TANG, L., WANG, K., JIN, L., YANG, G., JIA, H. & TAOUM, A., 2018. A resistivity model for testing unfrozen water content of frozen soil. Cold Regions Science and Technology. 153. 55-63.
• [20] VANAPALLI, S. & OH, W., 2010. Mechanics of unsaturated soils for the design of foundation structures. In Proceedings of the 3rd WSEAS international conference on Engineering mechanics, structures, engineering geology. 363-377.
• [21] WANG, A., XIE, Z., FENG, X. et al, 2014. A soil water and heat transfer model including changes in soil frost and thaw fronts. Science China Earth Sciences. 57 (6). 1325-1339.
• [22] WATANABE, K. & WAKE, T., 2009. Measurement of unfrozen water content and relative permittivity of frozen unsaturated soil using NMR and TDR. Cold Regions Science and Technology. 59 (1). 34-41.

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).