Akademik Veri Yönetim Sistemi
2nd International Conference on Transportation Geotechnics, ICTG 2012, Sapporo, Japonya, 09 Eylül 2012, ss.186-191, (Tam Metin Bildiri)
In ballasted railroad track, repeated wheel loads transferred from crossties to the ballast layer cause abrasion and degradation of the aggregates over time. In majority of ballasted track used by freight trains in the US, such particle breakage and aggregate degradation primarily contributes to the fouled content in the ballast layer to alter the gradation and morphological particle shape, surface texture and angularity properties. These changes weaken the bearing capacity of the ballast layer and eventually cause track geometry problems. The common practice in the laboratory, as well as in computational models, is to analyze new, clean ballast aggregates, which usually have higher angularity, superb particle interlock, and therefore sufficient shear strength. This paper focuses on recent research efforts at the University of Illinois aimed at investigating ballast performance associated with degradation and fouling levels in the field by analyzing both clean and deteriorated ballast particle size distributions and morphological properties.