Pooneh Maghoul

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Dr. Pooneh Maghoul is an Assistant Professor in the Department of Civil Engineering at the University of Manitoba. She received her M.Sc. in Soil and Rock Mechanics (2007) and her Ph.D. in Geotechnical Engineering (2010) at Ecole des Ponts Paris Tech (Paris Institute of Technology) in France. She received postdoctoral fellowships from NSERC-Hydro-Quebec Industrial Research Chair at Laval University (2010-2012) in Canada. Before joining the University of Manitoba, Dr. Maghoul worked as a project manager in Geotechnical Engineering (2013-2014) in Montreal. She also worked as a sessional lecturer at Polytechnique of Montreal and Ecole de Technologie Superieure (Engineering school of the University of Quebec in Montreal).

Dr. Maghoul's main scientific research interests are in analytical and numerical modeling of the multiphase porous media under thermal, quasi-static and dynamic loadings, using a coupled FEM/BEM technique. A few of the vast set of applications in this regard include multiphase transfer of heat, moisture (water and vapor) and air in porous media, cold regions engineering, CO2 sequestration modeling, study of the combined effects of topography and sediments on the amplification of seismic movements etc. She has published several research papers in leading journals and international conference proceedings.

Dr. Maghoul was nominated for several best Ph.D. awards in France. She is a registered professional engineer (P. Eng.) in the province of Quebec and served as the secretary (2013-2014) and the program director (2014-2015) at the Canadian Geotechnical Society - Western Quebec Section.

Civil Engineering
Geotechnical engineering
Numerical Modeling, Computational Mathematics, Geomechanics, Multiphase Porous Mechanics, Unsaturated Soils, Programming, Soil Dynamics
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Embankment Deformations by Using a Thermo-Elastic-Viscoplastic Soil Model

Period: Sept. 2015 - research is on-going!
Laboratory: University of Manitoba, Department of Civil Engineering
Funding: New Faculty Start-up Fund, University of Manitoba

THHM and HHM Models for Saturated and Unsaturated Soils under Thermal, Transient and Dynamic (Wave Propagation) Laodings

Period: Oct. 2007 - Sept. 2010, new research is on-going!
Laboratory: Navier Laboratory , Ecole des Ponts ParisTech (France).
Supervisors: Dr. Behrouz Gatmiri & Dr. Denis Duhamel.
Funding: Research Ph.D. Fellowship, École des Ponts ParisTech
Thermo-hydro-mechanical (THHM) and hydro-mechanical (HHM) models are presented based on the experimental observations and with respect to the poromechanics theory within the framework of the suction-based mathematical model presented by Gatmiri (1997) and Gatmiri et al. (1998). In these models, the effect of deformations on the suction distribution as well as the temperature in the soil skeleton and the inverse effects are included in the formulation via a suction-temperature-dependent formulation of state surfaces of void ratio and degree of saturation. The linear constitutive law is assumed. The mechanical and hydraulic properties of porous media are assumed to be dependent on suction and temperature. In this formulation, the solid skeleton displacements ui, water pressure pw and air pressure pa are presumed to be independent variables.

Numerical Methods: FEM/BEM Coupling Method in Multiphase Porous Media

Period: Oct. 2007 - Sept. 2010, new research is on-going!
Laboratory: Navier Laboratory , Ecole des Ponts ParisTech (France).
Supervisors: Dr. Behrouz Gatmiri & Dr. Denis Duhamel.
Funding: Research Ph.D. Fellowship, École des Ponts ParisTech
In order to model multiphase porous media behavior, first the governing partial differential equations should be derived and solved. Because of the complexity of the governing partial differential equations, with the exception of some simple cases, their closed-form solutions are not available. Therefore the numerical methods, such as the Finite Element Method (FEM) and the Boundary Element Method (BEM) , should be used for such partial differential equations. The FEM, the most popular method, regarding its vast ability in geomechanics as well as many other areas, has been used in many codes that have been developed for both saturated and unsaturated cases. The BEM, on the other hand, is a very effective numerical tool for dynamic analysis of linear elastic bounded and unbounded media. The method is very attractive for wave propagation problems, because the discretization is done only on the boundary, yielding smaller meshes and systems of equations. Another advantage is that this method represents efficiently the outgoing waves through infinite domains, which is very useful when dealing with waves scattered by topographical structures. When this method is applied to problems with semi-infinite domains, there is no need to model the far field. to take advantage of the benefits of the FEM and BEM, the combination of these techniques seems quintessential. This combination which results in a hybrid method, offer advantages not provided by a single method on its own.

During this project, the boundary element formulations (BEM) based on the convolution quadrature method (CQM) regarding the saturated and unsaturated porous media subjected to isothermal quasi-static and dynamic loadings are implemented via the computer code « HYBRID ». Having integrated the BEM formulations for the wave propagation, as well as the consolidation problems in the saturated and unsaturated porous media, it seems that now the first boundary element code is obtained that can model the various problems in dry, saturated and unsaturated soils.

The FEM/BEM coupling method used in « HYBRID » allows us to model the more complicated constitutive laws in the near field by using the FEM while large parts of the finite/infinite linear elastic domain in far field are treated using the BEM.

Closed-Form Solutions in Porous Media: Fundamental Solutions

Period: Oct. 2007 - Sept. 2010.
Laboratory: Navier Laboratory , Ecole des Ponts ParisTech (France).
Supervisors: Dr. Behrouz Gatmiri & Dr. Denis Duhamel.
Funding: Research Ph.D. Fellowship, École des Ponts ParisTech
In the BEM, during the formulation of boundary integral equations, the fundamental solutions for the governing partial differential equations should be derived first. Indeed, attempting to solve numerically the boundary value problems for unsaturated soils using BEM leads one to search for the associated fundamental solutions. In this project, for the first time, one establishes the boundary integral equations (BIE) and the associated fundamental solutions for the unsaturated porous media subjected to quasi-static loading for both isothermal (2D in the Laplace transform domain) and non-isothermal (2D and 3D in Laplace transform and time domains) cases. Also, the boundary integral equations as well as the fundamental solutions (2D and 3D in the Laplace transform domain) are obtained for the fully coupled dynamic model of unsaturated soils.

Seismic Site Effects

Period: Oct. 2006 - Sept. 2010., new research is on-going!
Laboratory: Navier Laboratory , Ecole des Ponts ParisTech (France).
Supervisors: Dr. Behrouz Gatmiri & Dr. Chloé Arson (2006-2007)
Funding: Research Ph.D. Fellowship, École des Ponts ParisTech
Once the computer code « HYBRID » is verified and validated, parametric studies on seismic site effects are carried out. The aim is to achieve a simple criterion directly usable by engineers, combining the topographical and geological characteristics of the soil, to predict the amplification of acceleration response spectra in fully-filled and semi-filled sedimentary as well as hollow valleys. The main results of this study are:

In an empty valley, the spectral acceleration responses are classified according to a unique geometrical criterion: the "surface/angle" ratio.
In an alluvial valley, fully- or partially-filled with sediments, from the contact point between sediments and bedrock up to the edge and outside of valleys, topographical effects prevail upon geological effects.
At the central point of the valley, the evolution of the site period Ts with the parameter S1/β√β (in which S1 is the surface of the section filled with sediments and β is the impedance contrast) has a linear tendency. This parameter combines the soil properties and the geometrical characteristics of the valley.
At the centre of the valley we can estimate the spectral ratio SR from the curve representing the evolution of (SR - 1) S1 as a function of S1/ β√β.

Foundation's Energy Efficiency in Cold Region

Period: Oct. 2006 - Sept. 2010., new research is on-going!
Laboratory: NSERC-Hydro-Québec Industrial Research Chair, Université Laval.
Supervisor: Dr. Jean Côté
Funding: NSERC-Hydro-Quebec Postdoctoral Fellowship

This project involved developing a numerical tool to model the coupled transfer of heat (conduction, convection, inter-particular radiation) and water in saturated and unsaturated soils by taking into account the effects of frost and snow cover through the global energy balance at the surface (radiation, convection, evaporation, etc.). This was performed by applying a mathematical and phenomenological model in which the soil freezing characteristic curve and therefore the ice content are obtained by combining a generalised form of the Clapeyron equation with the soil water retention curve (SWRC) and the thermodynamical equilibrium. The mass conservation was derived by considering the phase change and the water flux due to infiltration. Also, the heat conservation was derived considering phase change, conduction and convection of heat. This resulted in a system of coupled and highly non-linear differential equations. The numerical method used to solve the system of partial differential equations is based on a Galerkin Finite Element Method (FEM) with adaptive mesh refinement and dynamic time step control. The developed solution is validated by comparison with experimental data obtained from literature. Then, the impact of the insulator and the material used on the distributions of temperature and ice water content as well as the thermal performance of residential building foundations were studied.

Journal Papers

Maghoul P., Cote J., Pinel P., Fournier M., Modelling heat transfer between foundation and soil for a house built in a cold environment, Building and Environment, in preparation.
Maghoul P., Gatmiri B., Duhamel D., A Boundary Element Formulation based on the Convolution Quadrature Method for the Dynamic Behaviour Analysis of the Unsaturated Soils, Journal of Multiscale Modeling, in preparation.
Maghoul P., Gatmiri B., Duhamel D., 2011. Boundary integral formulation and two-dimensional fundamental solution for dynamic behaviour analysis of unsaturated soils, Soil Dynamics and Earthquake Engineering, vol.31(11), pp.1480-1495. [Link]
Maghoul P., Gatmiri B., Duhamel D., 2011. Wave propagation in unsaturated poroelastic media: boundary integral formulation and three-dimensional fundamental Solution, Computer Modelling in Engineering and Sciences, vol.78(1), pp.51-76. [Link]
Gatmiri B., Le Pense S., Maghoul P., 2011. A multi-scale seismic response of two-dimensional sedimentary valleys due to the combined effects of topography and geology, Journal of Multiscale Modeling, vol.3(3), pp. 133-149. [Link]
Maghoul P., Gatmiri B., Duhamel D., 2010. Three dimensional transient thermo-hydro-mechanical fundamental solutions of unsaturated soils, International Journal for Numerical and Analytical Methods in Geomechanics, vol.34, pp.297-329. [Link]
Gatmiri B., Maghoul P., Duhamel D., 2010. Two-dimensional transient fundamental solutions of multiphase porous media in frequency and time domains, International Journal of Solids and Structures, vol.47, pp.595-610. [Link]
Gatmiri B., Maghoul P., Arson C., 2009. Site-specific spectral response of seismic movement due to geometrical and geotechnical characteristics of sites, Soil Dynamics and Earthquake Engineering, vol.29, pp.51-70. [Link]

Conference Papers

Maghoul P., Gatmiri B., Le Pense S., Amini-Baneh D., Foroutan T., 2015. A Review of Seismic Site Amplification by Considering Geometrical and Geotechnical Characteristics of Sites, 68th Canadian Geotechnical Conference (GéoQuébec 2015), Quebec City, QC, Canada, September 20-23.
Maghoul P., 2013. Seismic site effect by considering geometrical and geotechnical characteristics of sites, 4th Canadian Young Geotechnical Engineers and Geoscientists Conference, Mont-Tremblant, QC, Canada, October 3-6.
Maghoul P., Gatmiri B., Fredlund M., Duhamel D., 2013. A Boundary Element Formulation for the Wave Propagation in the Unsaturated Soils, 5th Biot Conference on Poromechanics, Vienna, Austria, July 10-12. [Link]
Maghoul P., Cote J., Fournier M., 2012. Numerical Analysis for Transient Two-Dimensional Coupled Heat and Mass Transfer in Soils by Considering the Effect of Seasonal Frost, 15th International Conference on Cold Regions Engineering, Quebec, Canada, August 19-22. [Link]
Maghoul P., Cote J., Fournier M., 2012. Modelling the Two-Dimensional Coupled Heat and Mass Transfer in Soils beneath the Basements in Residential Buildings, The Canadian Conference on Building Simulation (eSim), Halifax, Canada, May 1-4.
Maghoul P., Gatmiri B., Duhamel D., 2011. Three-Dimensional Fundamental Solution for Unsaturated Poroelastic Media under Dynamic Loadings, 12th International Conference on Boundary Element and Meshless Techniques, Brasilia, Brazil, July 13-15. [Link]
Le Pense S., Gatmiri B., Maghoul P., 2011. Influence of soil properties and geometrical characteristics of sediment-filled valleys on earthquake response spectra, 8th International Conference on Structural Dynamics, Leuven, Belgium, July 4-6. [Link]
Maghoul P., Gatmiri B., Duhamel D., 2010. A Boundary Element Formulation based on the Convolution Quadrature Method for the Dynamic Behaviour Analysis of the Unsaturated Soils, 1st international conference on Multiscale, Paris, France, September 1-3.
Maghoul P., Gatmiri B., Duhamel D., 2010. A Boundary Element Formulation based on the Convolution Quadrature Method for the Quasi-static Behaviour Analysis of the Unsaturated Soils, 11th International Conference on Boundary Element and Meshless Techniques, Berlin, Germany, July 12-14. [Link]
Maghoul P., Gatmiri B., Duhamel D., 2010. Three-Dimensional Fundamental Solution for the Dynamic Behaviour Analysis of Multiphasic Porous Media, 4th European Conference on Computational Mechanics, Paris, France, May 16-21.
Maghoul P., Gatmiri B., Duhamel D., 2010. Two-Dimensional Fundamental Solution for the Dynamic Behaviour Analysis of Multiphasic Porous Media, 5th International Conference on Unsaturated soils, Barcelona, Spain, September 6-8.
Maghoul P., Gatmiri B., Duhamel D., 2009. Boundary Integral Equations in Frequency Domain for the Dynamic Behaviour Analysis of the Unsaturated Soils, 10th International Conference on Boundary Element and Meshless Techniques, Athens, Greece, July 22-24. [Link]
Maghoul P., Gatmiri B., Duhamel D., 2009. 3D Transient fundamental solution of multiphase porous media under heating, 4th Biot Conference on Poromechanics, New York, USA, June 8-10.
Maghoul P., Gatmiri B., Duhamel D., 2009. Transient Boundary Integral Equations of Unsaturated Poroelastic Media under Heating, 1st International Symposium on Computational Geomechanics (ComGeo I), Juan-les-Pins, France, April 29- May 1. [Link]
Maghoul P., Gatmiri B., Duhamel D., 2008. Two-dimensional Thermo-Poro- mechanic fundamental solution for unsaturated soils, 9th International Conference on Boundary Element and Meshless Techniques, Seville, Spain, July 9-11. [Link]

Technical Reports

Maghoul P., 2012. Vol 3 : Applications and Results, Hydro-Quebec's Research Institute (IREQ).
Maghoul P., 2012. Vol 2 : FlexPDE and definition of parameter for each subroutines, Hydro-Quebec's Research Institute (IREQ).
Maghoul P., 2012. Vol 1 : A multiphase constitutive modeling framework for unsaturated soils behavior under thermal loading, Hydro-Quebec's Research Institute (IREQ).

Dissertations

Maghoul P., 2010. Fundamental Solutions in Multiphase Geo-Poro-Mechanics for the Analysis of Seismic Site Effects, Ph.D. Dissertation, Ecole des Ponts ParisTech, Paris, France. [Link]
Maghoul P., 2007. Numerical study (BEM/FEM coupling model) of the combined effects of topography and geology on the seismic response of sedimentary valleys (2D Site Effects), Thesis for Master's degree, Ecole des Ponts ParisTech, Paris, France.

Invited Lectures

Maghoul P., 2014. Seismic Site Effects in NBCC (2005), Department of Civil Engineering, University of Manitoba Winnipeg, MA, November.
Maghoul P., 2014. Fundamental Solutions in Multiphase Geo-Poro-Mechanics for the Analysis of Seismic Site Effects, Department of Civil Engineering, University of Manitoba Winnipeg, MA, November.
Gatmiri B., Maghoul P., 2011. Three-dimensional Transient Thermo-Hydro-Mechanical Fundamental Solutions of Unsaturated Soils, International Workshop on Characterisation of Materials with inherent Micro structure: towards modeling of hydro-mechanical behavior, Ruhr-Universität Bochum, Germany, Mars.
Maghoul P., 2009. Fundamental Solutions in Multiphase Geomaterials for the Dynamic Soil-Structure Interaction Analyses, Internal seminar, ENPC ParisTech, Paris, France, January.

Current Students