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Title: Development of a two-surface model in multilaminate framework for soil
Author: Lee, K.-H.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2005
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In this study, a constitutive model called MLTS (two-surface model in multilaminate framework) is presented. It is shown that the two-surface model when formulated in the multilaminate framework responds to the rotation of principal stress axes, which is important in the context of cyclic loading and liquefaction of loose sand layers under earthquake conditions. The following conclusions have been reached: (1) MLTS model employs a non-associated flow rule for the yield surface and bounding surface as well. The formulation of isotropic and kinematic hardening model which is based on this flow rule has been presented. The kinematic and isotropic hardening based phenomenological features on sampling planes are contributed and appropriately summed up, therefore, the solution of any complexities involved in random cyclic loading can be obtained and presented; and (2) The model has been first implemented in the form of a Driver fro one gauss point analysis and then plugged in the finite element code, PLAXIS as user-defined soil model. In the last two chapters, the features of MLTS model have been demonstrated by the simulation of specific stress paths. Two numerical experiments, cyclic loading test and rotation principal loading test, have been carried out. Consequently, such results are a step closer to real nonlinear behaviour of soils.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available