Browsing School of Civil and Environmental Engineering Publications and Presentations by Title
Now showing items 84-103 of 108
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Seismic site effects by an optimized 2D BE/FE method I. Theory, numerical optimization and application to topographical irregularities
(Georgia Institute of Technology, 2007-10)This paper deals with the evaluation of seismic site effects due to the local topographical and geotechnical characteristics. The amplification of surface motions is calculated by a numerical method combining finite elements ... -
Seismic site effects by an optimized 2D BE/FE method. II. Quantification of site effects in two-dimensional sedimentary valleys
(Georgia Institute of Technology, 2007-10)This paper deals with the evaluation of seismic site effects due to the local topographical and geotechnical characteristics. The amplification of surface motions is calculated by a numerical method combining finite elements ... -
Self-consistent micromechanical approach for damage accommodation in rock-like polycrystalline materials
(Georgia Institute of Technology, 2017)In quasi-brittle polycrystalline materials, damage by cracking or cleavage dominates plastic and viscous deformation. This paper proposes a micromechanical model for rock-like materials, incorporating the elastic-damage ... -
Simulation of mode II unconstrained fracture path formation coupled with continuum anisotropic damage propagation in shale
(Georgia Institute of Technology, 2016-06)The objective of this work is to simulate mode II multi-scale fracture propagation in shale by coupling a continuum anisotropic damage model with a Cohesive Zone Model (CZM). The Continuum Damage Mechanics – based ... -
Simulation of salt cavity healing based on a micro-macro model of pressure-solution
(Geological Society, United Kingdom, 2019-01)CO₂ storage in salt rock is simulated with the Finite Element Method (FEM), assuming constant gas pressure. The initial state is determined by simulating cavity excavation with a Continuum Damage Mechanics (CDM) model. A ... -
Simulation of the Unsaturated Excavation Damage Zone Around a Tunnel Using A Fully Coupled Damage-Plasticity Model
(Georgia Institute of Technology, 2013-07)During tunnel excavation, stress redistribution produces plastic deformation and damage around the opening. Moreover, the surrounding soil can be either saturated or unsaturated. Suction has a significant influence on the ... -
Site-specific Spectral Response of Seismic Movement due to Geometrical and Geotechnical Characteristics of Sites
(Georgia Institute of Technology, 2008-04)It is well-known that the response of a site to a seismic solicitation depends on local topographical and geotechnical characteristics. Many aspects of seismic site effect still need to be studied in more detail and they ... -
Stiffness and Deformation of Rock Subjected to Anisotropic Damage and Temperature-Dependent Healing
(Georgia Institute of Technology, 2012-06)This research is motivated by the increasing need for geostorage facilities, mainly: nuclear waste disposals, high-pressure gas reservoirs and carbon dioxide sequestration systems. A new constitutive model is formulated ... -
Structure and mechanical behavior of dentin-inspired nanoporous copper
(2019)Dentin possesses a hierarchical porous structure with varying cross-scale morphology and characteristic lengths ranging from nanometers to micrometers. NP Copper is fabricated with nano-sized and micron-sized features that ... -
Substrate composition directs slime molds behavior
(2019)Physarum polycephalum, also called slime mold, is a giant single-celled organism that can grow to cover several square meters, forming search fronts that are connected to a system of intersecting veins. An original ... -
Tensile strength of calcite/HMWM and silica/HMWM interfaces: A Molecular Dynamics analysis
(Georgia Institute of Technology, 2020-03)The mechanical behavior of interfaces between high molecular weight methacrylate (HMWM) and concrete minerals (calcite and silica) is investigated from a Molecular Dynamics (MD) perspective. MD simulations of pullout tests ... -
Theoretical Bases of A Thermo-Mechanical Damage and DMT-Healing Model for Rock
(Georgia Institute of Technology, 2014-02)A theoretical framework is proposed to model thermo-mechanical (TM) crack opening, closure, and healing in rock. The model is based on Continuum Damage Mechanics and thermodynamics. The postulated free energy is a polynomial ... -
Theoretical study of damage accommodation in salt subject to viscous fatigue
(Georgia Institute of Technology, 2015-05)Underground salt cavities used for compressed air energy storage undergo cyclic loads and are subject to a fatigue phenomenon that reduces rock strength and stiffness. Understanding such behaviors and developing relevant ... -
Thermo-Hydro-Mechanical Modeling of Damage in Unsaturated Porous Media: Theoretical Framework and Numerical Study of the EDZ
(Georgia Institute of Technology, 2011-01)The damage model presented in this article (named ‘THHMD’ model) is dedicated to non-isothermal unsaturated porous media. It is formulated by means of three independent strain state variables, which are the thermodynamic ... -
A Thermo-Mechanical Damage Model for Rock Stiffness during Anisotropic Crack Opening and Closure
(Georgia Institute of Technology, 2013-11)A thermodynamic framework is proposed to couple the effect of mechanical stress and temperature on crack opening and closure in rocks. The model is based on continuum damage mechanics, with damage defined as the second-order ... -
Thermo-mechanical radial expansion of heat exchanger piles and possible effects on contact pressures at pile-soil interface
(Georgia Institute of Technology, 2014)This letter shows that the increase of heat exchanger pile capacity in response to heating, observed in several small-scale laboratory studies, cannot be directly attributed to the increase of contact pressure at the ... -
A thermodynamically consistent framework for saturated viscoplastic rock-materials subject to damage
(Georgia Institute of Technology, 2012-07)The aim of this study is to build a thermodynamically consistent theoretical framework to model viscoplasticity and damage in saturated geomaterials. The induced anisotropic damage is represented by a second-order tensor. ... -
Three Considerations for Modeling Natural Gas System Methane Emissions in Life Cycle Assessment
(Elsevier, 2019-03-13)Natural gas is a fossil fuel accounting for about 30% of US primary energy consumption. Climate change is one of the primary environmental issues associated with natural gas use: natural gas combustion releases carbon ... -
Towards a Thermodynamic Framework to Model Particle Crushing and Sieving
(Georgia Institute of Technology, 2013-06)Crushing implies the division of particles into smaller parts, and may involve a change in shape. Continuum-Based models of crushing give an average representation of elastic weakening, often in the form of a visco-plastic ... -
Transportation networks inspired by leaf venation algorithms
(2020)Biological systems have adapted to environmental constraints and limited resource availability. In the present study, we evaluate the algorithm underlying leaf venation (LV) deployment using graph theory. We compare the ...