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Sekiguchi-Ohta viscid _Input parameter

Ahmad Jazzar
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Hi there,

I have a question on how to determine the coefficient of secondary compression and the intital volumetric strain rate as part of the input parameters of the Sekiguchi-Ohta viscid model. The Material Models Manual suggests using a secondary compression index as an alternative to the above mentioned input parameters without any further information on how to specifiy it. Unfortunately I haven't found a lot in the literature about this subject. The second question is wether it is possible or not to derive the input parameters of the Sekugichi-Ohro viscid model out of the input data set of the soft soil creep model using the soil test tool by excuting back calculations?

Thank you all in advace.

Greetings

 

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  • +1 Offline

    Dear Ahmed,

    Apologies for the late reaction. It slipped my attention.

    I have the following comments from our research team:

    The secondary compression index in Sekiguchi-Ohta Viscid (SOV) model is the same as the creep index for secondary compression in the Soft Soil Creep (SSC) model, therefore it is equal to 2.3(1+e)alpha*
    where alpha* (or mu*) is related to lambda*, therefore I suppose a triaxial compression creep test is needed.
    There is a 1:1 match between SOV and SSC in terms of indices. The strength, however, is different by definition, with SOV having something similar to Cam-Clay (with a friction ratio M required explicitly), whereas SSC has double yielding with a Mohr-Coulomb failure criterion (therefore we have c, phi, psi) with the addition of a cap of Mod. Cam-Clay type (with M here automatically calculated from the rest of the parameters).
    So, it seems that there is no need to back-calculate through soil tests for the indices. The strength definition is different between the two models, therefore it cannot be related.
    I hope that this helps (even late).

    Answer Verified By: Ahmad Jazzar 

Reply
  • +1 Offline

    Dear Ahmed,

    Apologies for the late reaction. It slipped my attention.

    I have the following comments from our research team:

    The secondary compression index in Sekiguchi-Ohta Viscid (SOV) model is the same as the creep index for secondary compression in the Soft Soil Creep (SSC) model, therefore it is equal to 2.3(1+e)alpha*
    where alpha* (or mu*) is related to lambda*, therefore I suppose a triaxial compression creep test is needed.
    There is a 1:1 match between SOV and SSC in terms of indices. The strength, however, is different by definition, with SOV having something similar to Cam-Clay (with a friction ratio M required explicitly), whereas SSC has double yielding with a Mohr-Coulomb failure criterion (therefore we have c, phi, psi) with the addition of a cap of Mod. Cam-Clay type (with M here automatically calculated from the rest of the parameters).
    So, it seems that there is no need to back-calculate through soil tests for the indices. The strength definition is different between the two models, therefore it cannot be related.
    I hope that this helps (even late).

    Answer Verified By: Ahmad Jazzar 

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