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Rail track degradation under mud pumping evaluated through site and laboratory investigations

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  • Thanh Trung Nguyen
  • Buddhima Indraratna

Abstract

This paper presents the results of field and laboratory studies of slurry tracks along the South Coast rail line in NSW, Australia. Site investigations on fouled tracks were followed by a series of laboratory tests to determine the properties of mud fines, and how they can reduce track performance. This study reveals two distinctly different ways of forming slurry tracks, i.e., non-subgrade and subgrade mud pumping, resulting in different characteristics of degraded tracks. More cohesive the fouling materials are, the greater the reduction in hydraulic conductivity (kb) and shear strength (Sb) of the contaminated ballast. When the fouling index FI > 30%, kb drops severely, causing insufficient drainage capacity of the track while the loss of Sb can exceed 22%. Different types of fouling index are also discussed with reference to the field and laboratory data, followed by proposed empirical equations to estimate the values of kb and Sb.

Suggested Citation

  • Thanh Trung Nguyen & Buddhima Indraratna, 2022. "Rail track degradation under mud pumping evaluated through site and laboratory investigations," International Journal of Rail Transportation, Taylor & Francis Journals, vol. 10(1), pages 44-71, January.
    • Handle: RePEc:taf:tjrtxx:v:10:y:2022:i:1:p:44-71
    DOI: 10.1080/23248378.2021.1878947
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    Cited by:

    1. Ammad Hassan Khan & Zia ur Rehman & Wasim Abbass & Zubair Masoud & Abdeliazim Mustafa Mohamed & Dina Mohamed Fathi & Mubashir Aziz & Safeer Abbas, 2022. "Prediction of Post-Yield Strain from Loading and Unloading Phases of Pressuremeter, Triaxial, and Consolidation Test Curves for Sustainable Embankment Design," Sustainability, MDPI, vol. 14(5), pages 1-27, February.

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