Browsing School of Civil and Environmental Engineering Publications and Presentations by Title
Now showing items 44-63 of 109
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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 ... -
Mechanistic Analysis of Rock Damage Anisotropy and Rotation Around Circular Cavities
(Georgia Institute of Technology, 2015-01)We used the differential stress-induced damage (DSID) model to predict anisotropic crack propagation under tensile and shear stress. The damage variable is similar to a crack density tensor. The damage function and the ... -
A Method to Estimate the Energy Distribution During the Confined Comminution of Granular Materials
(Georgia Institute of Technology, 2017-06)During the confined comminution of granular materials, the work input is transformed into elastic energy stored in the grains, breakage energy used to generate new surfaces, energy dissipated by friction between grains ... -
Micro-macro analysis and phenomenological modeling of salt viscous damage and application to salt caverns
(Georgia Institute of Technology, 2015)This paper aims to gain fundamental understanding of the microscopic mechanisms that control the transition between secondary and tertiary creep around salt caverns in typical geological storage conditions. We ... -
Micro-Macro Approach of Salt Viscous Fatigue under Cyclic Loading
(Georgia Institute of Technology, 2015)The objective of this work is to explain the origin of fatigue observed in salt rock subject to cyclic loading. We used a self-consistent homogenization scheme to upscale the viscoplastic and damage behavior of halite ... -
Micro-Macro Modeling Approach for the Triggering of Viscous Fatigue Damage in Halite Polycrystals under Cyclic Loading
(Georgia Institute of Technology, 2014-06)Underground cavities in salt rock formations used for Compressed Air Energy Storage (CAES) undergo cyclic loads and are subject to a fatigue phenomenon that induces a decrease of rock’s strength and stiffness. A ... -
Micro-macro Modeling of Particle Crushing Based on Branch Lengths
(Georgia Institute of Technology, 2014-02)A micro-macro model of particle crushing is proposed. Microstructure changes are tracked with the density and size distribution of branch lengths. At the scale of a representative elementary volume (REV), the free energy ... -
Micro-mechanical analysis of salt creep tests with a joint-enriched Finite Element model
(Georgia Institute of Technology, 2016-06)In this study, micro-mechanisms that govern the viscous and damage behavior of salt polycrystal during creep processes are investigated. A Finite Element model is designed with POROFIS, in which surface elements represent ... -
Micro-mechanical Modeling for Rate-Dependent Behavior of Salt Rock under Cyclic Loading
(Georgia Institute of Technology, 2020)The dependence of rock behavior on the deformation rate is still not well understood. In salt rock, the fundamental mechanisms that drive the accumulation of irreversible deformation, the reduction of stiffness and the ... -
Microcrack Network Development in Salt-Rock During Cyclic Loading at Low Confining Pressure
(Georgia Institute of Technology, 2017-06)Triaxial compression tests of synthetic salt-rock are conducted to investigate microfracture development in a semibrittle polycrystalline aggregate. The salt-rock is produced from uniaxial consolidation of granular halite ... -
Micromechanics based discrete damage model with multiple non-smooth yield surfaces: theoretical formulation, numerical implementation and engineering applications
(2017-03)The discrete damage model presented in this paper accounts for 42 non-interacting crack microplanes directions. At the scale of the Representative Volume Element (RVE), the free enthalpy is the sum of the elastic energy ... -
Mineral weathering and bedrock weakening: Modeling microscale bedrock damage under biotite weathering
(2019)Bedrock weakening is of wide interest because it influences landscape evolution, chemical weathering, and subsurface hydrology. A longstanding hypothesis states that bedrock weakening is driven by chemical weathering of ... -
A mixed damage model for unsaturated porous media
(Georgia Institute of Technology, 2009-04)The aim of this study is to present a framework for the modeling of damage in continuous unsaturated porous geomaterials. The damage variable is a second-order tensor. The model is formulated in net stress and suction ... -
A model of damage and healing coupling halite thermo-mechanical behavior to microstructure evolution
(Georgia Institute of Technology, 2014-07)Creep processes in halite (salt rock) include glide, cross-slip, diffusion and dynamic recrystallization. Diffusive Mass Transfer (DMT) can result in crack rebonding, and mechanical stiffness recovery. Crack rebonding ... -
Modeling Damage Induced by Deviatoric Stress in Rock: Theoretical Framework
(Georgia Institute of Technology, 2013-07)This work focuses on the development of a new anisotropic damage model for porous rocks. This damage model is formulated within the framework of thermodynamic irreversible processes. Flow rules are expressed with the energy ... -
Modeling of Tensile and Compressive Damage in Layered Sedimentary Rock: A Direction Dependent Non-Local Model
(Georgia Institute of Technology, 2017-06)This paper presents the theoretical formulation and numerical implementation of an anisotropic damage model for materials with intrinsic transverse isotropy, e.g. sedimentary rocks with a bedding plane. The direction ... -
Modeling root system growth around obstacles
(Georgia Institute of Technology, 2020)State-of-the-Art models of Root System Architecture (RSA) do not allow simulating root growth around rigid obstacles. Yet, the presence of obstacles can be highly disruptive to the root system. We grew wheat seedlings in ... -
Modeling Stiffness Anisotropy Induced by Crack Opening in Rocks Subjected to Thermal versus Mechanical Stress Gradients
(Georgia Institute of Technology, 2013-06)A thermodynamic framework is proposed to model the coupled effects of mechanical and thermal stresses in rocks. The model is based on Continuum Damage Mechanics with damage defined as the second-order crack density tensor. ... -
Modeling the Anisotropic Damaged Zone Around Hydraulic Fractures: Thermodynamic Framework and Simulation of Mechanical Tests
(Georgia Institute of Technology, 2013-06)We model crack propagation and damage induced by deviatoric stress around the crack tip. A new damage model is proposed to describe the damaged zone near fractures, in order to predict the mesoscale geomechanical behavior ...
