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    Buried flexible pipes behaviour in unreinforced and reinforced soils under cyclic loading

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    Publication date
    201-04
    Author
    Elshesheny, Ahmed
    Mohamed, Mostafa H.A.
    Sheehan, Therese
    Keyword
    Geosynthetics
    Buried flexible pipe
    Geogrid-reinforced soil
    Incrementally cyclic loading
    Large-scale laboratory tests
    Strain gauge
    Unreinforced soil
    Rights
    © 2019 Thomas Telford (ICE Publishing). Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    Because of the recent worldwide construction expansion, new roads and buildings may be constructed over already existing buried infrastructures e.g. buried utility pipes, leading to excessive loads threatening their stability and longevity. Limited research studies are available to assess the effect of geogrid reinforcing layers inclusion on mitigating the additional stresses on buried structures due to cyclic loadings. In this research, large-scale fully instrumented laboratory tests were conducted to investigate the behaviour of flexible High-Density Polyethylene pipes (HDPE), in unreinforced and geogrid-reinforced sand, subjected to incrementally increasing cyclic loading, e.g. due to different vehicles capacities or load increase with passing time. Results illustrated that deformation rate in pipe and footing, strain generation rate in pipe and reinforcing layers are rapidly increased in the initial loading cycles, in particular during the first 300 cycles, and then the rate of change decreases significantly, as more cycles are applied. In the unreinforced case, increasing the pipe burial depth significantly reduced the generated deformation and strain in the pipe; however, it has a situational effect on the footing settlement, where it increased after pipe burial depth to its diameter ratio (H/D) of 2.5. In reinforced cases, deformation and strain significantly reduced with the increase in pipe burial depth and number of reinforcing layers. Measurement of strain illustrated that strain generated in the lower reinforcing layer is always higher than that recorded in the upper one, regardless pipe burial depth and value of applied load.
    URI
    http://hdl.handle.net/10454/16672
    Version
    Accepted Manuscript
    Citation
    Elshesheny A, Mohamed M and Sheehan T (2019) Buried flexible pipes behaviour in unreinforced and reinforced soils under cyclic loading. Geosynthetics International. 26(2): 184-205.
    Link to publisher’s version
    https://doi.org/10.1680/jgein.18.00046
    Type
    Article
    Collections
    Engineering and Informatics Publications

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