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    Investigation into Some Design Aspects of Ballasted Railway Track Substructure

    Access Status
    Fulltext not available
    Authors
    Shahin, Mohamed
    Date
    2008
    Type
    Conference Paper
    
    Metadata
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    Citation
    Shahin, M. 2008. Investigation into Some Design Aspects of Ballasted Railway Track Substructure, in No Listed (ed), Conference on Railway Engineering - CORE 2008, Sep 7-8 2008, pp. 617-623. Perth, Western Australia: Railway Technical Society of Austalasia (RSTA).
    Source Title
    Conference Proceedings on Rail - The Core of Intergrated Transport
    Source Conference
    Conference on Railway Engineering - CORE 2008
    ISBN
    0858257831
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/30339
    Collection
    • Curtin Research Publications
    Abstract

    Due to the daily congestion of highways, railways have become the most popular means of public transportation, which increased the demand for heavier and faster trains while keeping the cost of track maintenance at its minimum level. This requires an investigation into the effect of various design factors on the overall track performance. Such an investigation is very important for railway geotechnical engineers to arrive at optimum track design and maintenance. Ballasted railway track substructure consists of graded layers of granular media of ballast and sub-ballast (capping) placed above compacted subgrade. Conventional methods for design of ballasted railway track substructure are based on simple theoretical or empirical solutions that assume a homogeneous half-space for all track layers and neglect the individual properties of each layer. This results in overestimation of the vertical pressure distribution with depth, leading to incorrect estimation of track thickness (i.e. ballast and sub-ballast). In addition, most available methods assume linear elastic behaviour for substructure materials. In order to conduct more realistic multilayer simulations including material elastoplasticity, the more complex numerical solutions using the finite element method can be used. In this paper, two-dimensional versus three-dimensional finite element analyses using PLAXIS are carried out to investigate the validity of the simpler two-dimensional solutions. Furthermore, an elastoplastic constitutive model that represents more actual characteristics of track substructure materials is used and compared with the simpler elastic model. Detailed modelling of the track components including rail, sleepers, ballast, sub-ballast and subgrade is presented and the results are discussed.

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