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    Geobag Performance as Scour Countermeasure for Bridge Abutments

    Source: Journal of Hydraulic Engineering:;2007:;Volume ( 133 ):;issue: 004
    Author:
    Recep Korkut
    ,
    Emilio J. Martinez
    ,
    Reinaldo Morales
    ,
    Robert Ettema
    ,
    Brian Barkdoll
    DOI: 10.1061/(ASCE)0733-9429(2007)133:4(431)
    Publisher: American Society of Civil Engineers
    Abstract: This paper presents observations and data from a sequence of laboratory experiments conducted to evaluate geobags as a countermeasure to protect bridge-abutment foundations from failure attributable to scour of the alluvial-river channel in which they are placed. Geobags comprise geotextile cloth bags filled with local sediment or concrete. The experiments focused on the performance of geobags placed as an apron around pile-supported wing-wall abutments retaining erodible embankments, and subject to live-bed and clear-water flow conditions. Though an apron of geobags is shown to substantially reduce or eliminate scour immediately at the abutment, the apron must be formed flexibly of linked geobags. Moreover, a performance concern is that the apron may shift scour to a location flanking or downstream of the apron, and in so doing imperil a nearby pier or riverbank. The experiments indicate the importance of protecting the embankment region beneath and immediately behind the abutment’s pile cap. Live-bed conditions proved to be the more critical for abutment protection, owing to the capacity of dunes to destabilize geobags around the edges of the apron. Design guidelines are given and include using current riprap configurations for sizing and placing geobags.
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      Geobag Performance as Scour Countermeasure for Bridge Abutments

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    contributor authorRecep Korkut
    contributor authorEmilio J. Martinez
    contributor authorReinaldo Morales
    contributor authorRobert Ettema
    contributor authorBrian Barkdoll
    date accessioned2017-05-08T20:45:47Z
    date available2017-05-08T20:45:47Z
    date copyrightApril 2007
    date issued2007
    identifier other%28asce%290733-9429%282007%29133%3A4%28431%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/26283
    description abstractThis paper presents observations and data from a sequence of laboratory experiments conducted to evaluate geobags as a countermeasure to protect bridge-abutment foundations from failure attributable to scour of the alluvial-river channel in which they are placed. Geobags comprise geotextile cloth bags filled with local sediment or concrete. The experiments focused on the performance of geobags placed as an apron around pile-supported wing-wall abutments retaining erodible embankments, and subject to live-bed and clear-water flow conditions. Though an apron of geobags is shown to substantially reduce or eliminate scour immediately at the abutment, the apron must be formed flexibly of linked geobags. Moreover, a performance concern is that the apron may shift scour to a location flanking or downstream of the apron, and in so doing imperil a nearby pier or riverbank. The experiments indicate the importance of protecting the embankment region beneath and immediately behind the abutment’s pile cap. Live-bed conditions proved to be the more critical for abutment protection, owing to the capacity of dunes to destabilize geobags around the edges of the apron. Design guidelines are given and include using current riprap configurations for sizing and placing geobags.
    publisherAmerican Society of Civil Engineers
    titleGeobag Performance as Scour Countermeasure for Bridge Abutments
    typeJournal Paper
    journal volume133
    journal issue4
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/(ASCE)0733-9429(2007)133:4(431)
    treeJournal of Hydraulic Engineering:;2007:;Volume ( 133 ):;issue: 004
    contenttypeFulltext
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