Feasibility evaluation of using the crushed mineral stone for the railway ballast

Vaidas Ramūnas

Doctoral dissertation

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The quality of crushed stone is one of the most important factors, which determine the properties of ballast prism and durability of the entire superstructure of railway. Lifespan and costs of maintenance of the railway ballast are mostly dependent on mechanical properties of crushed stone. These properties become most impartant when aiming to select the most appropriate crushed stone for ballast prism, taking the intensity of expected traffic loads into account.

The aim of the dissertation is to provide a scientifically based crushed stone ballast selection methodology, where the physical and mechanical properties of the material, as well as the potential train traffic loads are evaluated.

Dissertation consists of introduction, three chapters, general conclusions, recommendations, the list of references, the list of author’s publications on the topic of the dissertation, summary in English and 6 annexes. Introduction describes the studied problem, topicality of the work and the object of research, the formulated aim and tasks, research methodology, scientific novelty, practical value of results, the defended propositions and the scope of the scientific work.

Chapter 1 contains a review of research works, describes functions and requirements of the railway line ballast. The chapter gives the analysis of causes and effects of ballast degradation, as well as currently used worldwide practices for crushed stone ballast selection. Condition of ballast on Lithuanian railway lines is evaluated.

Chapter 2 describes the creation of the methodology for selecting crushed stone ballast, which takes into account the physical and mechanical properties of the material. It also describes the creation of scientifically based methodology for calculating the lifespan of ballast. Physical and mechanical properties of crushed stone is examined. A program of standardized experimental research, its stages, object and results are provided.

Chapter 3 provides the evaluation of ballast properties when comparing their numeric values with the requirements found in standardized documents. Evaluation of ballast lifespan calculation method is performed and the classification for Los Angeles indicator and micro-Deval indicator is composed. Practical realization of ballast lifespan calculation methodology is provided. Analysis of costs and benefits of classification of indicators of the mechanical properties is performed.

Seven scientific articles were published on the topic of the dissertation: one – in scientific journal included in the Thomson Reuters Web of Knowledge (ISI Web of Science), three – in ISI Proceedings, three – in scientific journals, refereed in other international databases. On the topic of the dissertation, three presentations were made in three scientific conferences.

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DOI: https://doi.org/10.20334/2390-M

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Imprint No:
145×205 mm
128 p.
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