Journal ArticleDOI
An upscaling method and a numerical analysis of swelling/shrinking processes in a compacted bentonite/sand mixture
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In this article, a constitutive approach for highly compacted bentonite/sand mixture is developed accordingly, which is based on the diffuse double layer theory and connects microstructural properties of the bentonite as well as chemical properties of pore fluid with swelling potential.Abstract:
This paper presents an upscaling concept of swelling/shrinking processes of a compacted bentonite/sand mixture, which also applies to swelling of porous media in general. A constitutive approach for highly compacted bentonite/sand mixture is developed accordingly. The concept is based on the diffuse double layer theory and connects microstructural properties of the bentonite as well as chemical properties of the pore fluid with swelling potential. Main factors influencing the swelling potential of bentonite, i.e. variation of water content, dry density, chemical composition of pore fluid, as well as the microstructures and the amount of swelling minerals are taken into account. According to the proposed model, porosity is divided into interparticle and interlayer porosity. Swelling is the potential of interlayer porosity increase, which reveals itself as volume change in the case of free expansion, or turns to be swelling pressure in the case of constrained swelling. The constitutive equations for swelling/shrinking are implemented in the software GeoSys/RockFlow as a new chemo-hydro-mechanical model, which is able to simulate isothermal multiphase flow in bentonite. Details of the mathematical and numerical multiphase flow formulations, as well as the code implementation are described. The proposed model is verified using experimental data of tests on a highly compacted bentonite/sand mixture. Comparison of the 1D modelling results with the experimental data evidences the capability of the proposed model to satisfactorily predict free swelling of the material under investigation. Copyright © 2004 John Wiley & Sons, Ltd.read more
Citations
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A parallel finite element scheme for thermo-hydro-mechanical (THM) coupled problems in porous media
TL;DR: A novel implementation of a parallel finite element method (FEM) for the numerical analysis of coupled thermo-hydro-mechanical problems in porous media using MPI for inter-processor communication is presented.
Journal ArticleDOI
Temperature effects on the swelling pressure and saturated hydraulic conductivity of the compacted GMZ01 bentonite
TL;DR: In this article, the authors used a newly developed apparatus to measure the swelling pressure and saturated hydraulic conductivity of a compacted Gao-Miao-Zi (GMZ01) bentonite with an initial dry density of 1.7 Mg/m3 at various temperatures.
Journal ArticleDOI
A method for predicting swelling pressure of compacted bentonites
TL;DR: In this paper, an approach for predicting swelling pressure of bentonites based on thermodynamic relationships between swelling pressure and suction is presented in order to predict buffer and sealing material for nuclear waste repository.
Journal ArticleDOI
Numerical simulation of reactive processes in an experiment with partially saturated bentonite.
TL;DR: Simulations show that the easily soluble minerals in bentonite determine the porewater chemistry, and changes of the effective porosity caused by bentonite swelling can be very large.
Journal Article
A coupled THMC model of a heating and hydration laboratory experiment in unsaturated compacted FEBEX bentonite
TL;DR: In this paper, a non-isothermal multiphase flow and multicomponent reactive solute transport model for a deformable medium of a heating and hydration experiment performed on a sample of compacted FEBEX bentonite is presented.
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