3D Analysis of Seepage under Hydraulic Structures with Intermediate Filters

A. Ahmed, S. McLoughlin, H. Johnston

    Research output: Contribution to journalArticle

    7 Citations (Scopus)
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    Abstract

    Seepage flow under hydraulic structures provided with intermediate filters has been investigated. The flow through the banks of the canal has been included in the model. Different combinations of intermediate filter and canal width were studied. Different lengths of the floor, differential heads, and depths of the sheet pile driven beneath the floor were also investigated. The introduction of an intermediate filter to the floor of hydraulic structures reduced the uplift force acting on the downstream floor by up to 72%. The maximum uplift reduction occurred when the ratio of the distance of filter location downstream from the cutoff to the differential head was 1. Introducing a second filter in the downstream side resulted in a further reduction in the exit hydraulic gradient and in the uplift force, which reached 90%. The optimum locations of the two filters occurred when the first filter was placed just downstream of the cutoff wall and the second filter was placed nearly at the middistance between the cutoff and the end toe of the floor. The results showed significant differences between the three-dimensional (3D) and the two-dimensional (2D) analyses.
    Original languageEnglish
    Pages (from-to)06014019-1 -06014019-6
    JournalJournal of Hydraulic Engineering
    Volume141
    Issue number1
    Early online date22 Sep 2014
    DOIs
    Publication statusPublished - Jan 2015

    Fingerprint

    Hydraulic structures
    hydraulic structure
    Seepage
    seepage
    filter
    Canals
    Bridge decks
    uplift
    Piles
    canal
    Hydraulics
    cutoff wall
    analysis
    pile
    hydraulics

    Cite this

    Ahmed, A. ; McLoughlin, S. ; Johnston, H. / 3D Analysis of Seepage under Hydraulic Structures with Intermediate Filters. In: Journal of Hydraulic Engineering. 2015 ; Vol. 141, No. 1. pp. 06014019-1 -06014019-6.
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    abstract = "Seepage flow under hydraulic structures provided with intermediate filters has been investigated. The flow through the banks of the canal has been included in the model. Different combinations of intermediate filter and canal width were studied. Different lengths of the floor, differential heads, and depths of the sheet pile driven beneath the floor were also investigated. The introduction of an intermediate filter to the floor of hydraulic structures reduced the uplift force acting on the downstream floor by up to 72{\%}. The maximum uplift reduction occurred when the ratio of the distance of filter location downstream from the cutoff to the differential head was 1. Introducing a second filter in the downstream side resulted in a further reduction in the exit hydraulic gradient and in the uplift force, which reached 90{\%}. The optimum locations of the two filters occurred when the first filter was placed just downstream of the cutoff wall and the second filter was placed nearly at the middistance between the cutoff and the end toe of the floor. The results showed significant differences between the three-dimensional (3D) and the two-dimensional (2D) analyses.",
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    3D Analysis of Seepage under Hydraulic Structures with Intermediate Filters. / Ahmed, A.; McLoughlin, S.; Johnston, H.

    In: Journal of Hydraulic Engineering, Vol. 141, No. 1, 01.2015, p. 06014019-1 -06014019-6.

    Research output: Contribution to journalArticle

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    AU - McLoughlin, S.

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    AB - Seepage flow under hydraulic structures provided with intermediate filters has been investigated. The flow through the banks of the canal has been included in the model. Different combinations of intermediate filter and canal width were studied. Different lengths of the floor, differential heads, and depths of the sheet pile driven beneath the floor were also investigated. The introduction of an intermediate filter to the floor of hydraulic structures reduced the uplift force acting on the downstream floor by up to 72%. The maximum uplift reduction occurred when the ratio of the distance of filter location downstream from the cutoff to the differential head was 1. Introducing a second filter in the downstream side resulted in a further reduction in the exit hydraulic gradient and in the uplift force, which reached 90%. The optimum locations of the two filters occurred when the first filter was placed just downstream of the cutoff wall and the second filter was placed nearly at the middistance between the cutoff and the end toe of the floor. The results showed significant differences between the three-dimensional (3D) and the two-dimensional (2D) analyses.

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