2018, Vol. 5, No. 2. - go to content...

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DOI: 10.15862/15SATS218 (https://doi.org/10.15862/15SATS218)

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Makarov A.S., Kraev A.N. Justification of the geometric and time scale of the motor road model on permafrost soils under laboratory conditions. Russian Journal of Transport Engineering. 2018; 5(2). Available at: https://t-s.today/PDF/15SATS218.pdf (in Russian). DOI: 10.15862/15SATS218

Justification of the geometric and time scale of the motor road model on permafrost soils under laboratory conditions

Makarov Aleksei Sergeevich
Industrial university of Tyumen, Tyumen, Russia
E-mail: Mak351218@mail.ru

Kraev Alexey Nikolaevich
Industrial university of Tyumen, Tyumen, Russia
E-mail: kraev_aln@mail.ru

Abstract. In the article, the authors proposed small-scale experiments with the aim of repeating the temperature and humidity operating conditions of the objects under study, taking into account temporal and geometric scale factors. In order to verify the correctness of the chosen time to geometric scale correlation, numerical simulations of simple objects with identical thermophysical characteristics were performed. Numerical simulations were carried out using a bilayered explicit difference scheme, including the balance method with the enthalpy formulation of the problem. Objects in the geometric scale MG 1:1 and a time scale MT 1:1 were simulated in the QFrost program complex. Objects in the geometric scale MG 1:30 and time scale MT 1:900 were simulated using the Microsoft Office Excel program. Comparison of the numerical simulation data in the QFrost and Microsoft Office Excel software is presented. The possible estimation of applying a time scale depending on the geometric scale is given. A mathematical simulation of plane-parallel freezing of the highway footing in the geometric scale MG 1:1 and a time scale MT 1:1 in the QFrost software complex is performed. Taking into account the chosen dependence of the time scale on the geometric scale, a comparison of the results of mathematical modeling and a small-scale laboratory experiment, that was performed at the geometric scale of MG 1:30 to dimensions of the modeled object, is made. The most probable causes of the discrepancy between the results of experimental and numerical modeling are revealed. The main conclusions on the conducted researches are formulated.

Keywords: highway; permafrost; experimental studies; numerical simulation; temperature; soil freezing; scale factor

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