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Behavior of geogrid-reinforced ballast under various levels of fouling

Journal Article


Abstract


  • This paper presents a study of how the interface between ballast and geogrid copes with fouling by coal

    fines. The stress-displacement behavior of fresh and fouled ballast, and geogrid reinforced ballast was

    investigated through a series of large-scale direct shear tests where the levels of fouling ranged from 0%

    to 95% Void Contamination Index (VCI), at relatively low normal stresses varying from 15 kPa to 75 kPa.

    The results indicated that geogrid increases the shear strength and apparent angle of shearing resistance,

    while only slightly reducing the vertical displacement of the composite geogrid-ballast system. However,

    when ballast was fouled by coal fines, the benefits of geogrid reinforcement decreased in proportion to

    the increasing level of fouling. A conceptual normalized shear strength model was proposed to predict

    this decrease in peak shear stress and peak angle of shearing resistance caused by coal fines at a given

    normal stress.

Publication Date


  • 2011

Citation


  • Indraratna, B., Ngo, N. Trung. & Rujikiatkamjorn, C. (2011). Behavior of geogrid-reinforced ballast under various levels of fouling. Geotextiles and Geomembranes, 29 (3), 313-322.

Scopus Eid


  • 2-s2.0-79954845023

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/902

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 313

End Page


  • 322

Volume


  • 29

Issue


  • 3

Abstract


  • This paper presents a study of how the interface between ballast and geogrid copes with fouling by coal

    fines. The stress-displacement behavior of fresh and fouled ballast, and geogrid reinforced ballast was

    investigated through a series of large-scale direct shear tests where the levels of fouling ranged from 0%

    to 95% Void Contamination Index (VCI), at relatively low normal stresses varying from 15 kPa to 75 kPa.

    The results indicated that geogrid increases the shear strength and apparent angle of shearing resistance,

    while only slightly reducing the vertical displacement of the composite geogrid-ballast system. However,

    when ballast was fouled by coal fines, the benefits of geogrid reinforcement decreased in proportion to

    the increasing level of fouling. A conceptual normalized shear strength model was proposed to predict

    this decrease in peak shear stress and peak angle of shearing resistance caused by coal fines at a given

    normal stress.

Publication Date


  • 2011

Citation


  • Indraratna, B., Ngo, N. Trung. & Rujikiatkamjorn, C. (2011). Behavior of geogrid-reinforced ballast under various levels of fouling. Geotextiles and Geomembranes, 29 (3), 313-322.

Scopus Eid


  • 2-s2.0-79954845023

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/902

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 313

End Page


  • 322

Volume


  • 29

Issue


  • 3