Coupled Hydro-Mechanical Analysis of Excavation Damaged Zones around an Underground Opening in Sedimentary Rock
H. Abdi, E. Evgin, M. Fall, T.S. Nguyen, and G. Su
University of Ottawa, Ottawa, ON, Canada
Canadian Nuclear Safety Commission, Ottawa, ON, Canada
A large amount of research work has been carried out in many countries to determine the viability of radioactive waste disposal in deep geological repositories. It is well known that excavation can cause damage around underground openings. On the other hand, the mechanical damage can influence the stability of the opening and the flow characteristics of the rock mass. In addition, all physical ...
Thermal Performance of a Deviated Deep Borehole Heat Exchanger: Insights from a Synthetic Heat and Flow Model
M. Le Lous , F. Larroque , A. Dupuy , A. Moignard 
 ENSEGID, Bordeaux, France
 Fonroche Géothermie, Pau, France
Earth heat exchangers are drawing increasing attention and popularity due to their efficiency, sustainability and universality. In addition, DBHE can offer higher temperatures and more return on investment than conventional system. DBHE is also an alternative to geothermal power generation or to direct use applications in an extreme engineered (or enhanced) geothermal systems (EGS). However, the ...
J. Burrow , A. Bond ,
 Quintessa Ltd, United Kingdom
The UK Advanced Gas-cooled Reactor fleet, operated by EDF Energy, utilize a graphite core consisting of a lattice of around 3000 annular bricks. Due to irradiation, oxidation and thermal effects, the bricks deform and loose mass as they age. Of key concern is the late-life behavior of the bricks, in particular the predicted time at which brick shrinkage reverses into expansion, generating large ...
D. Sampietro , E. Abarca , H. von Schenck , J. Molinero 
 Amphos 21 Consulting S.L., Barcelona, Spain
 Swedish Nuclear Fuel and Waste Management Co., Stockholm, Sweden
Radioactive waste repositories include barriers that work to contain the waste, thereby protecting human health and the environment. In deep geological disposal systems, barriers include the natural geological barrier and the engineered barrier system (EBS). The ability of the EBS to limit groundwater flow is important and optimized design solutions are often sought by means of numerical ...
A. Schwen, G. Bodner, A. Schnepf, D. Leitner, G. Kammerer, and W. Loiskandl
Institute of Hydraulics and Rural Water Management, Univ. Natural Resour. Appl. Life Sci., BOKU, Wien, Austria
Institute of Agronomy and Plant Breeding, Univ. Natural Resour. Appl. Life Sci., BOKU, Wien, Austria
Institute of Soil Science, Univ. Natural Resour. Appl. Life Sci., BOKU, Wien, Austria
Modeling soil water dynamics requires an accurate description of soil hydraulic properties, i.e. the retention and hydraulic conductivity functions. Generally, these functions are assumed to be unchanged over time in most simulation studies. In this paper, we implemented temporal changes in the soil hydraulic properties in a Richards’ equation simulation of soil water dynamics. Based on ...
E. Evgin, J. Infante Sedano, and Z. Fu
University of Ottawa
This paper is a part of a study on energy piles for heating and cooling of buildings. Energy piles are used for two reasons: (1) to transfer structural loads to foundation soils, and (2) to transfer heat from foundation soils to the building for space heating in winter time and for cooling purposes in summer time by transferring heat from the building to the foundation soils. The efficiency of ...
Computation of the Longitudinal Dispersion Coefficient in an Adsorbing Porous Medium Using Homogenization
A. Rijnks, M. Darwish, and H. Bruining
StatoilHydro ASA, Bergen, Norway
Shell Exploration & Production International Centre, Rijswijk,
Section of Geoengineering, Faculty of Civil Engineering and Geosciences, TU Delft, Delft, The Netherlands
The method to derive upscaled expressions for the dispersion coefficients for reactive flow in a porous medium uses a periodic unit cell (PUC), which consists for instance of a spherical grain in a cube, but nothing prohibits defining more complex PUC's. Homogenization leads to a coupled system of equations where the flow is described by Stokes equation and the concentration fluctuation is ...
S. Hoyer, M. Bottig, F. Zekiri, G. Götzl, A.K. Brüstle, G. Schubert, A. Nador
Geological survey of Austria, Vienna, Austria
Geological Institute of Hungary, Budapest, Hungary
Temperature measurements of the subsurface are available due to hydrocarbon exploration in the project area, where the average drilling depth is about 2-4 km and the deepest well reaches about 8.5 km. Since the data is heavily uneven distributed, standard interpolation techniques did not deliver satisfying results. This is why numerical modeling was applied to assess the thermal regime of the ...
E. Zanchini, and T. Terlizzese
Dipartimento di Ingegneria Energetica, Nucleare e del Controllo Ambientale, Università di Bologna, Bologna, Italy
The results of two thermal response tests recently performed on two vertical borehole heat exchangers (BHEs) are presented. The BHEs have the same cross section and a depth of 100 m and 120 m respectively. The evaluation of the thermal properties of the ground and grout are performed by a finite-element simulation method, developed through the software package COMSOL Multiphysics 3.4.
Effect of Groundwater Flow on the Subsurface Temperature within Crystalline Rocks of Southern Norway
Y. P. Maystrenko , O. Olesen ,
 Geological Survey of Norway (NGU), Trondheim, Norway
The subsurface thermal regime has been investigated in boreholes from southern Norway. During the purely conductive 2D thermal modeling, the COMSOL Heat Transfer for Solids interface has been used to simulate heat transfer by heat conduction. COMSOL physics interfaces Heat Transfer in Porous Media and Porous Media and Subsurface Flow/Darcy's Law have been used to carry out a fully coupled ...