Thesis
Yield functions for cemented soils using thermomechanics
Washington State University
Master of Science (MS), Washington State University
2012
Handle:
https://hdl.handle.net/2376/102667
Abstract
The yield behavior of bonded and cemented soils is different from laboratory reconstituted soils. Experimental results have shown that these soils generally have yield surfaces whose shape and shift in the stress space is dependent on the amount of bonding present. Several models based on an elastic-plastic framework incorporating ideas of critical state soil mechanics have been proposed to capture this behavior. In some cases such models have been found to violate the laws for thermodynamics. This study presents a thermomechanical formulation for developing yield functions suitable for cemented soils using thermomechanics. The formulation is based on the choice of a free energy function and a dissipation function from the beginning and ensures that no thermodynamic laws are violated. Different choices of the dissipation function are proposed to capture the characteristics of the yield surfaces of bonded soils. It is shown that the alpha-gamma model form of the dissipation function could capture the yield loci of published laboratory experimental data. It is found that the shape and shift of the yield surfaces are controlled by the model parameters which are functions of cementation. The anisotropic dissipation function proposed is shown to be better suited to model the yield behavior of natural soils. Parametric studies conducted show that the rotation of the yield surface is controlled by the anisotropy parameter.
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Details
- Title
- Yield functions for cemented soils using thermomechanics
- Creators
- Zeyad Katab
- Contributors
- Balasingam Muhunthan (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525294801842
- Language
- English
- Resource Type
- Thesis