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Chemo-Hygro-Geomechanics of Enhanced Crack Propagation

dc.contributor.advisor Hueckel, Tomasz Hu, Manman 2015-05-12T20:47:01Z 2016-05-01T04:30:05Z 2015
dc.description.abstract <p>This dissertation studies the chemo-hygro-mechanical coupling involved in the process of crack propagation encountered both in natural and engineered context. Chemical processes are likely to affect the mechanical properties of geo-materials, resulting in possible weakening effect. The deformation and micro-cracking induced by material weakening in turn enhances the overall mass removal. In this study, several models within both elasticity and plasticity domain are developed for a better understanding of the enhanced crack propagation. A deformational plasticity model based on experimental observations is addressed. Rigid-plasticity models are applied to various boundary conditions. In the chemo-elasticity model, chemical dissolution is assumed to be a function of a comprehensive strain invariant. One-way coupling and two-way coupling models are discussed. In the two-way coupling model, volumetric strain coupling and deviatoric strain coupling are compared. A variety of loading modes are adopted to investigate the chemical enhancement of propagation of a single crack. The behavior of the material is either rigid-plastic, or elastic with the variable of mass removal enters the constitutive equation as a chemical strain. Comparison between the results from two models is presented and discussed.</p>
dc.subject Civil engineering
dc.subject Environmental geology
dc.subject Geological engineering
dc.subject chemo-elasticity
dc.subject chemo-placticity
dc.subject crack propagation
dc.subject fracture in rocks
dc.subject mass removal
dc.subject mineral dissolution
dc.title Chemo-Hygro-Geomechanics of Enhanced Crack Propagation
dc.type Dissertation
dc.department Civil and Environmental Engineering
duke.embargo.months 11

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