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    Numerical behaviour of buried flexible pipes in geogrid-reinforced soil under cyclic loading

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    Publication date
    2020-06
    Author
    Elshesheny, Ahmed
    Mohamed, Mostafa H.A.
    Nagy, N.M.
    Sheehan, Therese
    Keyword
    Buried flexible pipe
    Cyclic loading
    Elasto-plastic constitutive behaviour
    Numerical modelling
    Slack effect
    Three-dimensional geogrid modelling
    Rights
    © 2020 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
    Peer-Reviewed
    Yes
    Open Access status
    Green
    
    Metadata
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    Abstract
    Three-dimensional finite element models were executed and validated to investigate the performance of buried flexible high-density Polyethylene (HDPE) pipes, in unreinforced and multi-geogrid-reinforced sand beds, while varying pipe burial depth, number of geogrid-layers, and magnitude of applied cyclic loading. Geogrid-layers were simulated considering their geometrical thickness and apertures, where an elasto-plastic constitutive model represented its behaviour. Soil-geogrid load transfer mechanisms due to interlocked soil in-between the apertures of the geogrid-layer were modelled. In unreinforced and reinforced cases, pipe burial depth increase contributed to decreasing deformations of the footing and pipe, and the crown pressure until reaching an optimum value of pipe burial depth. On the contrary, the geogrid-layers strain increased with increasing pipe burial depth. A flexible slab was formed due to the inclusion of two-geogrid-layers, leading to an increase in the strain in the lower geogrid-layer, despite its lower deformation. Inclusion of more than two geogrid-layers formed a heavily reinforced system of higher stiffness, and consequently, strain distribution in the geogrid-layers varied, where the upper layer experienced the maximum strain. In heavily reinforced systems, increasing the amplitude of cyclic loading resulted in a strain redistribution process in the reinforced zone, where the second layer experienced the maximum strain.
    URI
    http://hdl.handle.net/10454/18416
    Version
    Accepted manuscript
    Citation
    Elshesheny A, Mohamed M, Nagy NM et al (2020) Numerical behaviour of buried flexible pipes in geogrid-reinforced soil under cyclic loading. Computers and Geotechnics. 122: 103493.
    Link to publisher’s version
    https://doi.org/10.1016/j.compgeo.2020.103493
    Type
    Article
    Collections
    Engineering and Informatics Publications

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