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GeoStudio | PLAXIS Wiki SHANSEP NGI-ADP model - PLAXIS UDSM
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    SHANSEP NGI-ADP model - PLAXIS UDSM

    Application PLAXIS 2D
    PLAXIS 3D
    Version PLAXIS 2D CONNECT Edition V20 Update 1
    PLAXIS 3D CONNECT Edition V20 Update 1
    Date created 17 January 2020
    Date modified 17 January 2020

    The SHANSEP NGI-ADP model is an advanced constitutive model developed to enable the analysis of dikes and embankments according to the new design requirements (based upon undrained Critical State calculations) within a FEM environment. It overcomes limitations of the traditional NGI-ADP model with respect to the varying undrained shear strength of soils due to load history. Three additional input parameters are needed for this model, namely α, m and sAu,min. They are used to calculate (update) the undrained shear strength sAu dependent on the effective stress history by using the SHANSEP concept. The effect of parameters α and m was investigated and the results show that the effect of α is more dominant. However, the range of variation of these two parameters is short.

    UDSM - Shansep NGI ADP model
    Undrained behaviour of real soft soil (a) and SHANSEP NGI-ADP model (b)

    The SHANSEP NGI-ADP model in combination with other constitutive models

    Apart from using the SHANSEP NGI-ADP model merely as an NGI-ADP model and then switching to the SHANSEP concept as described in the attached document, it is possible to use it as an 'extension' of any other constitutive model implemented in PLAXIS.
    The process to switch from another soil model to the SHANSEP NGI-ADP model is described in the document as well, by using the Special option parameter to activate the SHANSEP concept and by changing the material of the soil cluster to the SHANSEP NGI-ADP model.


    With the release of PLAXIS 2D/3D CONNECT Edition V20 Update 1 (January 2020), the PLAXIS User Defined Soil models are delivered with the PLAXIS installation. When enabling the Geotechnical SELECT Entitlement [GSE] when starting the PLAXIS application, this model becomes available in the Parameters tab when selecting "User defined" for the Material model.

    Downloads

    • PLAXIS-UDSM-ShansepNGIADPModel_(2018).pdf

    See also

    UDSM - SHANSEP MC model    [Models]


    Hoek-Brown material model    [Verifcations]


    Plaxis User Defined Soil Models  [Models]

    • PLAXIS 3D
    • UDSM
    • shansep
    • PLAXIS
    • undrained behaviour
    • NGI-ADP
    • plx-udsm
    • PLAXIS 2D
    • User defined soil model
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    • Micha van der Sloot Created by Bentley Colleague Micha van der Sloot
    • When: Fri, Jan 17 2020 10:06 AM
    • Felipe Fonseca Last revision by Bentley Colleague Felipe Fonseca
    • When: Thu, Oct 13 2022 5:14 AM
    • Revisions: 4
    • Comments: 0
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