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Title: A finite element continuum model for consolidation due to pumpage
Author: Kang, J.-S.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2006
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The drain method is based on Terzaghi’s one-dimensional consolidation theory and Barron’s vertical drain. Even when using finite element simulation, numerical solution for consolidation problems involve averaging material properties such as elastic modulus, Poisson’s ratio, and coefficients of permeability. But the results are too unreliable to use practical purposes. Classical mechanics alone do not provide sufficient information on global motion equation of fluid in porous media. A new approach is presented in this paper to the problem of continuum modelling of vacuum-induced consolidation due to pumpage. This finite element continuum model uses the interior boundary condition instead of installed vacuum tube as a line, with changing pore pressures at the installed material being treated as boundary conditions of the interior part. An innovative linear equation solution method for separate fixed boundary conditions is presented. The efficacy of this model for field construction is shown by comparing with the results obtained to field measurements at the Jangyoo sewage plant. Because the properties of material are not exact in their natural states, the results of the calculated finite modelling are similar but not a mirror image of field measurements. Whereas conventional one-dimensional calculation uses only one point, the finite element continuum model shows displacements and pore pressures for a whole section. Once the exact material properties have been determined, the model can be applied effectively to field analyses predicting settlements due to pumpage and facilitating making about when pumpage should start and stop. The finite continuum model for consolidation due to pumpage can be applied to other soil improvement methods, such as prefabricated and pack vertical drain, with some modification.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available