Prof. David Masin, I am posting the queries I have emailed you earlier which you have answered and therefore I am posting it here as per your request. I wish to bring to your attention on one of the input parameters which is the bulk modulus of water, Kw. According to the PLAXIS implementation of Hypoplasticity guide which comes with the UDSM dll file from PLAXIS, it was recommended that Kw = 0 for drained analysis, consolidation analysis and undrained analysis.

However, if I refer to your webpage , (refer to uploaded image) based on a sample of London Clay parameters under the parameters tab, the Kw is a large value adopting the Penalty approach instead of 0 as recommended by PLAXIS implementation on hypoplasticity guide. Appreciate if you could advise which is the correct input. Thank you.

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  1. David Mašín
    David Mašín 5 years ago

    Dear Joel,
    Thanks for posting the question here so that potentially the others may also benefit from it.
    You have basically two options:
    – Par 15=Kw & Drained material set in plaxis
    – Par 15=0 & Undrained material set in plaxis
    The reslults should be the identical.
    The reason for having Kw in the parameter table is just to Abaqus, which does not have the “undrained” option so setting Kw through the user defined soil model parameter table is the only option.
    Regards David

    • Sudipta Bhowmick
      Sudipta Bhowmick 3 years ago

      Dr. David

      I have one query about the bulk modulus of water, Kw. What value of bulk modulus of water, Kw should be appropriate for Undrained analysis ( for SANISAND) model. I am using ABAQUS to simulate the consolidated undrained test. In the documentation for the SANISAND model, the recommended value of Kw is 0 (zero), But for undrained analysis, I am not sure what value of Kw should be used. My confining pressure for the analysis is set 210kPa.

      Thank you.

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