Loading...
Search for:
partially-saturated
0.006 seconds
3D modeling of cohesive crack growth in partially saturated porous media: A parametric study
, Article Engineering Fracture Mechanics ; Vol. 124-125, issue , 2014 , pp. 272-286 ; ISSN: 00137944 ; Khoei, A. R ; Sharif University of Technology
Abstract
In this paper, the 3D cohesive crack propagation is presented in partially saturated porous media. The double-nodded zero-thickness cohesive interface elements are employed to capture the mixed mode fracture behavior. In order to describe the behavior of fractured media, two balance equations are applied similar to those employed for the mixture of solid-fluid phase in semi-saturated media, including: the momentum balance of fractured media, and the balance of fluid mass within the fracture. Crack permeability is modified based on the data obtained from experimental results to consider the roughness of fracture walls effect
An extended finite element method for fluid flow in partially saturated porous media with weak discontinuities; The convergence analysis of local enrichment strategies
, Article Computational Mechanics ; Volume 51, Issue 3 , March , 2013 , Pages 327-345 ; 01787675 (ISSN) ; Khoei, A. R ; Sharif University of Technology
Abstract
In this paper, a numerical model is developed for the fully coupled analysis of deforming porous media containing weak discontinuities which interact with the flow of two immiscible, compressible wetting and non-wetting pore fluids. The governing equations involving the coupled solid skeleton deformation and two-phase fluid flow in partially saturated porous media are derived within the framework of the generalized Biot theory. The solid phase displacement, the wetting phase pressure and the capillary pressure are taken as the primary variables of the three-phase formulation. The other variables are incorporated into the model via the experimentally determined functions that specify the...
Hydro-mechanical modeling of cohesive crack propagation in multiphase porous media using the extended finite element method
, Article International Journal for Numerical and Analytical Methods in Geomechanics ; Volume 37, Issue 10 , July , 2013 , PP. 1247–1279 ; Khoei, A. R. (Amir Reza) ; Sharif University of Technology
Abstract
In this paper, a numerical model is developed for the fully coupled hydro-mechanical analysis of deformable, progressively fracturing porous media interacting with the flow of two immiscible, compressible wetting and non-wetting pore fluids, in which the coupling between various processes is taken into account. The governing equations involving the coupled solid skeleton deformation and two-phase fluid flow in partially saturated porous media including cohesive cracks are derived within the framework of the generalized Biot theory. The fluid flow within the crack is simulated using the Darcy law in which the permeability variation with porosity because of the cracking of the solid skeleton...
Modeling of cohesive crack growth in partially saturated porous media; A study on the permeability of cohesive fracture
, Article International Journal of Fracture ; Volume 167, Issue 1 , Jan , 2011 , Pages 15-31 ; 03769429 (ISSN) ; Khoei, A. R ; Mofid, M ; Sharif University of Technology
Abstract
Modeling the water flow in cohesive fracture is a fundamental issue in the crack growth simulation of cracked concrete gravity dams and hydraulic fracture problems. In this paper, a mathematical model is presented for the analysis of fracture propagation in the semi-saturated porous media. The solid behavior incorporates a discrete cohesive fracture model, coupled with the flow in porous media through the fracture network. The double-nodded zero-thickness cohesive interface element is employed for the mixed mode fracture behavior in tension and contact behavior in compression. The modified crack permeability is applied in fracture propagation based on the data obtained from experimental...
A semi-empirical shear strength model for infilled rock fractures with infills in an unsaturated state
, Article Geotechnical Frontiers 2017, 12 March 2017 through 15 March 2017 ; Issue GSP 280 , 2017 , Pages 529-538 ; 08950563 (ISSN) ; Mousavi, S ; Khosravi, M ; Brandon T. L ; Valentine R. J ; Geo-Institute (G-I) of the American Society of Civil Engineers; Industrial Fabrics Association International (IFAI) ; Sharif University of Technology
American Society of Civil Engineers (ASCE)
2017
Abstract
Based on the results of recent studies, comprehensive characterization of the behavior of infilled rock fractures under saturated and unsaturated conditions requires knowledge of morphological details of fracture surface, as well as state of stress of infill materials and their initial innate conditions (e.g., void ratio, water content, degree of saturation and dry density). This paper describes a semi-empirical equation to interpret the effects of wall-roughed nature of the fractures and presence of partially saturated fine materials within the fractures on the behavior of infilled rock fractures during shear. The proposed equation incorporates the soil-water retention curve parameters as...
EFG mesh-less method for coupled hydro-mechanical analysis of unsaturated porous media
, Article Unsaturated Soils: Research and Applications - Proceedings of the 6th International Conference on Unsaturated Soils, UNSAT 2014 ; Vol. 1, issue , July , 2014 , p. 581-587 ; 978-1-138-00150-3 ; Pak, A ; Sharif University of Technology
Abstract
Numerical modeling of the fully coupled phenomena of solid deformation-fluid flow in partially saturated porous media is of great interest in many branches of science and engineering. In this study, a new formulation based on one of the famous mesh-less methods, called Element-Free Galerkin (EFG), is developed to simulate the water and air movement through variably saturated soils. For this purpose, the governing partial differential equations including the equilibrium equation and mass conservation laws for each fluid phase are discretized in space using the same EFG shape functions. To enforce the essential boundary conditions, penalty method is employed. Temporal discretization is...
Hydro-mechanical modeling of cohesive crack propagation in multiphase porous media using the extended finite element method
, Article International Journal for Numerical and Analytical Methods in Geomechanics ; Volume 37, Issue 10 , 2013 , Pages 1247-1279 ; 03639061 (ISSN) ; Khoei, A. R ; Sharif University of Technology
2013
Abstract
SUMMARY: In this paper, a numerical model is developed for the fully coupled hydro-mechanical analysis of deformable, progressively fracturing porous media interacting with the flow of two immiscible, compressible wetting and non-wetting pore fluids, in which the coupling between various processes is taken into account. The governing equations involving the coupled solid skeleton deformation and two-phase fluid flow in partially saturated porous media including cohesive cracks are derived within the framework of the generalized Biot theory. The fluid flow within the crack is simulated using the Darcy law in which the permeability variation with porosity because of the cracking of the solid...
Hydro-mechanical modeling of two-phase fluid flow in deforming, partially saturated porous media with propagating cohesive cracks using the extended finite element method
, Article Computational Plasticity XI - Fundamentals and Applications, COMPLAS XI, 7 September 2011 through 9 September 2011 ; September , 2011 , Pages 1516-1527 ; 9788489925731 (ISBN) ; Khoei, A. R ; Sharif University of Technology
Abstract
In the present paper, a fully coupled numerical model is developed for the hydromechanical analysis of deforming, progressively fracturing porous media interacting with the flow of two immiscible, compressible wetting and non-wetting pore fluids. The governing equations involving the coupled two-phase fluid flow and deformation processes in partially saturated porous media containing cohesive cracks are derived within the framework of the generalized Biot theory. The displacement of the solid phase, the pressure of the wetting phase and the capillary pressure are taken as the primary unknowns of the three-phase formulation. A softening cohesive law is employed to describe the nonlinear...
Numerical modeling of multiphase fluid flow in deforming porous media: A comparison between two- and three-phase models for seismic analysis of earth and rockfill dams
, Article Computers and Geotechnics ; Volume 38, Issue 2 , March , 2011 , Pages 142-166 ; 0266352X (ISSN) ; Mohammadnejad, T ; Sharif University of Technology
Abstract
In this paper, a fully coupled numerical model is presented for the finite element analysis of the deforming porous medium interacting with the flow of two immiscible compressible wetting and non-wetting pore fluids. The governing equations involving coupled fluid flow and deformation processes in unsaturated soils are derived within the framework of the generalized Biot theory. The displacements of the solid phase, the pressure of the wetting phase and the capillary pressure are taken as the primary unknowns of the present formulation. The other variables are incorporated into the model using the experimentally determined functions that define the relationship between the hydraulic...
Analyzing transient heat and moisture transport surrounding a heat source in unsaturated porous media using the Green's function
, Article Geothermics ; Volume 81 , 2019 , Pages 224-234 ; 03756505 (ISSN) ; Ghasemi Fare, O ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
Generally, in most areas, groundwater level is deep and heat sources (e.g., energy piles)are embedded in unsaturated soil media. Therefore, in order to accurately analyze the soil response close to heat sources, both heat and moisture transport in unsaturated soil domain should be considered. Thermal loading changes the moisture content in the porous media. In this study, the energy conservation and mass fluid continuity equations derived from hydrothermal analysis of a partially saturated soil medium are considered in cylindrical coordinate system. To make the analytical solution possible, partial differential equations (PDEs)are turned into ordinary differential equations (ODEs), through...
Thermo-hydro-mechanical modeling of fracturing porous media with two-phase fluid flow using X-FEM technique
, Article International Journal for Numerical and Analytical Methods in Geomechanics ; Volume 44, Issue 18 , October , 2020 , Pages 2430-2472 ; Mortazavi, S. M. S ; Sharif University of Technology
John Wiley and Sons Ltd
2020
Abstract
In this paper, a fully coupled thermo-hydro-mechanical model is presented for two-phase fluid flow and heat transfer in fractured/fracturing porous media using the extended finite element method. In the fractured porous medium, the traction, heat, and mass transfer between the fracture space and the surrounding media are coupled. The wetting and nonwetting fluid phases are water and gas, which are assumed to be immiscible, and no phase-change is considered. The system of coupled equations consists of the linear momentum balance of solid phase, wetting and nonwetting fluid continuities, and thermal energy conservation. The main variables used to solve the system of equations are solid phase...