Browsing School of Civil and Environmental Engineering Publications and Presentations by Issue Date
Now showing items 1-20 of 109
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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 ... -
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 ... -
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 ... -
θ-STOCK, a powerful tool of thermohydromechanical behaviour and damage modelling of unsaturated porous media
(Georgia Institute of Technology, 2008-09)A brief review of the basic points of a suction-based heat, moisture transfer and skeleton deformation equations for an unsaturated medium is presented. The main issues such as: two temperature-dependent state surfaces of ... -
On damage modelling in unsaturated clay rocks
(Georgia Institute of Technology, 2008-10)The aim of this paper is to present the main problems encountered in the modelling of damage in an unsaturated quasi-brittle rock mass. Micromechanical damage models are based on a physical definition of damage, related ... -
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 Multiphase Analysis for Environmental Impact Assessment with Theta-Stock Finite Element Program
(Georgia Institute of Technology, 2010-03)In the THM modeling of multiphase medium, the coupling effects of skeleton, suction, and temperature have been integrated via the concept of state surfaces of void ratio and degree of saturation. Based on proposed formulation, ... -
Numerical study of a thermo-hydro-mechanical damage model for unsaturated porous media
(Georgia Institute of Technology, 2010-05)The “THHMD” damage model presented in this article is dedicated to non-isothermal unsaturated porous media. The proposed frame is based on the use of independent state variables (net stress, suction and thermal stress). ... -
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 ... -
Numerical Study of Damage in Unsaturated Geological and Engineered Barriers
(Georgia Institute of Technology, 2011-04)The theoretical framework of a damage model dedicated to non-isothermal unsaturated porous media is presented. The damage variable is a second-order tensor, and the model is formulated in independent state variables. The ... -
Applications of Poromechanics to Energy Engineering
(Georgia Institute of Technology, 2012-01) -
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 ... -
Using a geo-mechanical damage model to assess permeability in cracked porous media: internal length parameter issues
(Georgia Institute of Technology, 2012-01)The THHMD model is a thermo-hydro-mechanical damage model dedicated to unsaturated rocks. The present article questions one of the postulates of the model's formulation, namely using the same Representative Elementary ... -
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 ... -
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. ... -
On The Definition Of Damage In Time-Dependent Healing Models For Salt Rock
(Georgia Institute of Technology, 2012-07)his research is motivated by the increasing need for geostorage facilities such as nuclear waste disposals, high-pressure gas reservoirs and carbon dioxide sequestration systems. Salt rock has favourable creep properties, ... -
Applications of Damage Poromechanics to Geostorage and Injection Problems
(Georgia Institute of Technology, 2012-07-12) -
Multi-Scale Fracture Creation and Network Generation During Hydraulic Fracturing
(Georgia Institute of Technology, 2013-06)Here we describe both a sequential, hierarchical multi-scale approach for designing scale-dependent constitutive models at different levels of refinement in the problem as well as an open-source, massively parallel software ... -
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 ... -
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. ...