Browsing School of Civil and Environmental Engineering Publications and Presentations by Title
Now showing items 26-45 of 108
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Fabric evolution and crack propagation in salt during consolidation and cyclic compression tests
(2020)It is of great interest to describe and quantify the evolution of microstructure for a better understanding of rock deformation processes. In this study, 2D microstructure images of salt rock are analyzed at several stages ... -
Fabric-based modeling of thermo-mechanical damage and healing around salt caverns
(Georgia Institute of Technology, 2015-05)Geotechnical reservoirs and repositories in salt such as nuclear waste disposals, geothermal systems, and compressed air energy storage (CAES) are usually subject to complex thermo-mechanical conditions, leading to crack ... -
Fabric-enriched Modeling of Anisotropic Healing induced by Diffusion in Granular Salt
(Georgia Institute of Technology, 2015-07)This study aims to model anisotropic damage (i.e. increase of porosity and loss of stiffness) and healing (i.e. recovery of stiffness) in salt rock subject to microcrack initiation, propagation, and rebonding. We introduce ... -
Finite Element Simulation of Anisotropic Damage Around Pressurized Boreholes in Prefractured Shale
(Georgia Institute of Technology, 2015-05)Optimizing hydraulic fracture injection parameters in order to maximize hydrocarbon extraction and to avoid extensive borehole spalling is still an open issue. In this paper, the Differential Stress Induced Damage (DSID) ... -
Fluid driven transition from damage to fracture in anisotropic porous media - a multiscale XFEM approach
(2019)In this paper, a numerical method is proposed to simulate multiscale fracture propagation driven by fluid injection in transversely isotropic porous media. Intrinsic anisotropy is accounted for at the continuum scale, by ... -
Fracture-Induced Anisotropy of the Stress-Strain Response of Shale at Multiple Scales
(Georgia Institute of Technology, 2016)This paper investigates deformation and stiffness anisotropy induced by damage propagation in rock brittle deformation regime. Specifically, a Finite Element-based Continuum Damage Mechanics model is used to capture sample ... -
A fully coupled damage-plasticity model for unsaturated geomaterials accounting for the ductile-brittle transition in drying clayey rocks
(Georgia Institute of Technology, 2016-04)This paper presents a hydro-mechanical constitutive model for clays accounting for damage-plasticity couplings. Specific features of unsaturated clays such as confining pressure and suction effects on elastic domain and ... -
A generalized equation for rheology of emulsions and suspensions of deformable particles subjected to simple shear at low Reynolds number
(Georgia Institute of Technology, 2014-11)We present analyses to provide a generalized rheological equation for suspensions and emulsions of non-Brownian particles. These multiparticle systems are subjected to a steady straining flow at low Reynolds number. We ... -
Generalized Stress Variables in Continuum Damage Mechanics
(Georgia Institute of Technology, 2014-07)“Damage” in Continuum Mechanics is an internal variable used at the scale of a Representative Elementary Volume (REV) to model the decrease of stiffness due to the nucleation and propagation of crack tips in the bulk. ... -
Heat Damaged Cement Paste Characterization Using Nonlinear Acoustic Waves
(Georgia Institute of Technology, 2013-07)This paper focuses on the experimental characterization of the elastic properties of sound and heat-damaged cement paste for different water cement ratio. The method of the nonlinear acoustic is based on the Higher Harmonic ... -
Homogenization of Cemented Soil Stiffness and Application to the Study of Arching Effects between Jet-Grouted Columns
(Georgia Institute of Technology, 2014-06)This paper presents a study of the effect of jet-grouting on soil stiffness. Several homogenization techniques are tested at the scale of a Representative Elementary Volume to determine the stiffness of a mixture made of ... -
Homogenization of dentin elastic properties based on microstructure characterization, statistical back-analysis and FEM simulation
(Georgia Institute of Technology, 2017-07)The dentinal tissue is made of tubules surrounded by peri-tubular dentin (PTD), embedded in a matrix of inter-tubular dentin (ITD). Hashin and Rosen found exact stiffness bounds for hexagonal patterns of hollow fibers. But ... -
Horizontal directional drilling (HDD) alignment optimization using ant colony optimization
(2020)Horizontal Directional Drilling (HDD) is a trenchless method that consists in drilling an inclined and curved bore from an entry point to an exit point. In practice, HDD is designed iteratively by trial and error, to ... -
Image processing of fabric evolution in granular salt subject to diffusive mass transfer
(Georgia Institute of Technology, 2015-05)Because of its favorable creep properties and low gas permeability, salt rock is viewed as an attractive host medium for nuclear waste disposals and natural resources storage. Under high stress and temperature conditions, ... -
Influence of Damage on Pore Size Distribution and Permeability of Rocks
(Georgia Institute of Technology, 2012-01)The model proposed in this article relates permeability to porosity measurements that can easily be performed in the laboratory. The pore size distribution (PSD) curve is updated with strains and damage. The updated ... -
Integrated Decision Support Tool (iDST) Life Cycle Costing Module for Distributed Stormwater Control Measures (SCMs)
(Georgia Institute of Technology, 2020-05-18)The life cycle costing (LCC) module for distributed stormwater control measures (SCMs) for the integrated decision support tool (i-DST) supporting analysis of green, grey, and hybrid stormwater infrastructure deployment ... -
An Investigation of Methods for Imputing Attitudes from One Sample to Another
(2017-06)Often in practice, researchers have a (“target”) dataset that is desirable in many ways, but is missing some key variables, or “knowledge”, that would greatly enrich the value of the data for investigating questions of ... -
An Isotropic Self-Consistent Homogenization Scheme For Chemo-Mechanical Healing Driven By Pressure Solution In Halite
(Georgia Institute of TechnologyElsevier, 2018)Mechanical healing is the process by which a damaged material recovers mechanical stiffness and strength. Pressure solution is a very effective healing mechanism, common in crystalline media. Chemical reactions initiate ... -
Mechanical Behavior and Microstructure Development in Consolidation of Nominally Dry Granular Salt
(Georgia Institute of Technology, 2016-06)Uniaxial consolidation of granular salt is carried out to study the mechanical behavior and fabric development in a material that deforms by microscopic brittle and intracrystalline-plastic processes. Dry granular salt is ...