Modelling of railway ballast and sub-ballast layers structure and properties

Modelling of railway ballast and sub-ballast layers structure and properties considering ambient air factors and train traffic load

Deividas Navikas

Doctoral dissertation

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The relevance of the dissertation relates to the improvement of the existing numerical models and design norms of the “car–track” system. Comprehensive analysis of physical and mechanical properties of mineral materials used to install railway track construction was carried out in the course of the thesis, also performing a quantitative assessment of the impact of technological processes on the change of these properties. Properties of different railway track construction layers exposed to the maximum rolling stock axle load, different ambient air temperatures and moisture were determined. Analysis of scientific works, numerical modelling and experimental research were carried out for this purpose.

The dissertation consists of the introduction, three chapters, general conclusions, references, a list of publications by the author on the topic of the dissertation, summary in English and 7 annexes.

The introduction presents the research problem, the relevance of the thesis and the object of the research. The objective and tasks of the thesis are formulated, describing the research methodology, the scientific novelty of the thesis, the practical significance of the results of the thesis and the defence statements. Author publications on the topic of the dissertation are listed at the end of the introduction.

The first chapter analyses research works related with the properties and technologies used to instal the railway track construction and their influence on the performance indicators of the construction. The “car–track” system models and the impact of destructive factors on the performance indicators of the railway track construction are analysed. The methods and means used to maintain and restore the performance indicators of the railway track construction are discussed.

The second chapter presents the identification of the ambient air factors and their assessment. Numerical models for determining the hydrothermal mode of the railway track construction and rolling stock loads affecting the railway track construction are compiled.

The third chapter presents result of the experimental research carried out to investigate the physical and mechanical properties of materials used to install the railway track construction. This chapter presents the results of physical processes that occur in the railway track constructions and its deformation results. The created numerical models and the results received in application there of allow improving the existing numerical models and revising design methodologies including increasingly more destructive factors.

4 articles were published on the topic of the dissertation: one – in the scientific journal included in the Thomson Reuters Web of Science database with a citation index, two – in scientific journals refereed in publications of other international databases and one – in international conference journal assessed by Thomson Reuters database Proceedings.

Read electronic version of the book:

DOI: https://doi.org/10.20334/2018-020-M

Book details

Data sheet

Year:
2018
ISBN:
978-609-476-107-2
Imprint No:
2018-020-M
Dimensions:
145×205 mm
Pages:
160 p.
Cover:
Softcover
Language:
Lithuanian
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