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    Protection of buried rigid pipes using geogrid-reinforced soil systems subjected to cyclic loading

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    Publication date
    2020-08
    End of Embargo
    2021-06-05
    Author
    Elshesheny, Ahmed
    Mohamed, Mostafa H.A.
    Sheehan, Therese
    Keyword
    Buried rigid pipe
    Geosynthetics
    Incrementally cyclic loading
    Passive arching
    Pipe invert rebound
    Slack effect
    Peer-Reviewed
    Yes
    Open Access status
    Green
    
    Metadata
    Show full item record
    Abstract
    The performance of buried rigid pipes underneath geogrid-reinforced soil while applying incrementally increased cyclic loading was assessed using a fully instrumented laboratory rig. The influence of varying two parameters of practical importance was investigated; the pipe burial depth and the number of geogrid-layers. Measurements were taken for pipe deformation, footing settlement, strain in pipe and reinforcing layers, and pressure/soil stress on the pipe crown during various stages of cyclic loading. The research outcomes demonstrated a rapid increase in the rate of deformation of the pipe and the footing, and the rate of generated strain in the pipe and the geogrid-layers during the first 300 cycles. While applying further cycles, those rates were significantly decreased. Increasing the pipe burial depth and number of geogrid-layers resulted in reductions in the footing and the pipe deformations, the pressure on pipe crown, and the pipe strains. Redistribution of stresses, due to the inclusion of reinforcing layers, formed a confined zone surrounding the pipe providing it with additional lateral support. The pipe invert experienced a rebound, which was found to be dependent on pressure around the pipe and the degree of densification of the bedding layer. Data for strains measured in the geogrid-layers showed that despite the applied loading value and the pipe burial depth, the tensile strain in the lower geogrid-layer was usually higher than that measured in the upper layer.
    URI
    http://hdl.handle.net/10454/18408
    Version
    Accepted manuscript
    Citation
    Elshesheny A, Mohamed MHA and Sheehan T (2020) Protection of buried rigid pipes using geogrid-reinforced soil systems subjected to cyclic loading. Soil Dynamics and Earthquake Engineering. 135: 106210.
    Link to publisher’s version
    https://doi.org/10.1016/j.soildyn.2020.106210
    Type
    Article
    Notes
    The full-text of this article will be released for public view at the end of the publisher embargo on 5 Jun 2021.
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    Engineering and Informatics Publications

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