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  • Numerical testing on wave-induced seabed liquefaction with a poro-elastoplastic model

    Author(s)
    Ye, Guan-lin
    Leng, Jian
    Jeng, Dong-sheng
    Griffith University Author(s)
    Jeng, Dong-Sheng
    Year published
    2018
    Metadata
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    Abstract
    Dynamic seabed response under wave loading is one of key factors for the design and construction of offshore structures. Most previous studies were based on poroelastic seabed model. In this paper, based on a unified elasto-plastic constitutive model that can describe the liquefaction of sand and two-phase u-p theory for saturated soils, numerical tests are conducted to analyze the dynamic responses of a sandy seabed subjected to cyclic wave loads. The development of liquefaction zone, the change of excess pore water pressure (EPWP), the effective stress path, and the displacement vector are investigated. Numerical tests ...
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    Dynamic seabed response under wave loading is one of key factors for the design and construction of offshore structures. Most previous studies were based on poroelastic seabed model. In this paper, based on a unified elasto-plastic constitutive model that can describe the liquefaction of sand and two-phase u-p theory for saturated soils, numerical tests are conducted to analyze the dynamic responses of a sandy seabed subjected to cyclic wave loads. The development of liquefaction zone, the change of excess pore water pressure (EPWP), the effective stress path, and the displacement vector are investigated. Numerical tests show that the proposed method is able to capture the mechanical behaviors of wave induced liquefaction of a sandy seabed. The calculated effective stress path and change of EPWP are similar to those of earthquake-induced liquefaction. In other words, the mechanism of wave-induced and earthquake-induced liquefaction are similar, despite of the loading forms. The liquefaction depth increases with the number of wave cycles. Meanwhile, a phase lag is observed between the liquefied seabed and wave motion. A comparison between the dynamic response of elastic and elasto-plastic seabed is presented to underline the importance of considering the plastic deformation of seabed.
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    Journal Title
    Soil Dynamics and Earthquake Engineering
    Volume
    105
    DOI
    https://doi.org/10.1016/j.soildyn.2017.11.026
    Subject
    Geophysics
    Geophysics not elsewhere classified
    Civil engineering
    Publication URI
    http://hdl.handle.net/10072/381543
    Collection
    • Journal articles

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