caa a22 4500 463162919 CHVBK 20180406164753.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s11242-006-9083-2 doi (NATIONALLICENCE)springer-10.1007/s11242-006-9083-2 Chemo-hydro-mechanical coupled consolidation for a poroelastic clay buffer in a radioactive waste repository [Elektronische Daten] [Guangjing Chen, Domenico Gallipoli, Alberto Ledesma] Salt rock or rock with salty ground water are often encountered as host media for the underground disposal of radioactive waste. The nuclear waste, contained in a metallic canister, is usually placed inside a tunnel or a shaft excavated in the rock deposit together with a buffer of compacted bentonite inserted between the host rock and the canister to provide hydro-mechanical sealing. Due to the very low permeability and rich clay content, the bentonite acts as an osmotic semi-permeable membrane under a gradient of concentration of salt dissolved in the ground water. In addition, chemically induced expansion or shrinkage of the bentonite is generated by changes in the concentration of dissolved salt. By including such important chemical aspects, the hydro-mechanical governing equations are derived for this particular boundary value problem within the framework of a linear Biot-like isotropic poroelastic consolidation. The equations are solved analytically and a parametric study is undertaken to highlight the influence of chemical osmosis and chemical deformation on the flow and mechanical response of the bentonite buffer. Springer Science+Business Media, Inc., 2007 Chemical osmosis nationallicence Chemical consolidation nationallicence Radioactive waste repository nationallicence Poroelastic nationallicence Chemical concentration nationallicence Latin symbols nationallicence $${c_{{\rm b}\ast}}$$ : Boundary chemical concentration nationallicence $${c_{\ast}}$$ : Chemical concentration nationallicence $${c_{0\ast}}$$ : Initial chemical concentration nationallicence D * : Effective coefficient of diffusion of solute in pore fluid nationallicence J * : Non-advective flux of solute nationallicence $${{k^\prime}_{{\rm h}\ast}}$$ : Coefficient of hydraulic permeability nationallicence $${{k^\prime}_{\pi \ast }}$$ : Coefficient of osmotic permeability nationallicence M s : Solute molar mass nationallicence m v : Coefficient of compressibility associated to a change of effective mean stress nationallicence m π : Coefficient of compressibility associated to a change of osmotic pressure nationallicence n : Porosity nationallicence n 0 : Initial porosity nationallicence $${p_{{\rm b}\ast } }$$ : Boundary pore fluid pressure nationallicence p * : Pore fluid pressure nationallicence R : Universal gas constant equal to 8.314J/(Kmol) nationallicence r * : Radial coordinate nationallicence R − A : Electrostatic repulsive minus attractive stress nationallicence T : Absolute temperature nationallicence u * : Radial displacement nationallicence $${v_{\ast}^{\rm s}}$$ : Flux of solid phase nationallicence v * : Flux of pore fluid nationallicence $${v_{{\rm h}\ast}}$$ : Flux of pore fluid - component due to hydraulic pressure gradient nationallicence $${v_{\pi \ast}}$$ : Flux of pore fluid - component due to osmotic pressure gradient nationallicence $${v_{{\rm c}\ast} }$$ : Flux of solute nationallicence Greek symbols nationallicence $${\alpha _\ast }$$ : Coefficient of linear strain associated to a change of chemical concentration nationallicence $${\varepsilon _{v} }$$ : Volumetric strain nationallicence γ l : Unit weight of pore fluid nationallicence $${\xi _\ast }$$ : Relative change of pore fluid density associated to a change of chemical concentration nationallicence μ : Shear modulus nationallicence ν : Poisson's ratio nationallicence π : Osmotic pressure nationallicence ρ : Density of the pore fluid nationallicence $${\sigma _{{\rm r}\ast } }$$ : Total radial stress nationallicence $${\sigma _{\theta \ast } }$$ : Total tangential stress nationallicence $${\sigma _\ast }$$ : Total mean stress nationallicence σ : Osmotic efficiency nationallicence Chen Guangjing Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia, Barcelona, Spain aut Gallipoli Domenico School of Engineering, Durham University, Durham, UK aut Ledesma Alberto Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia, Barcelona, Spain aut Transport in Porous Media Kluwer Academic Publishers 69/2(2007-09-01), 189-213 0169-3913 69:2<189 2007 69 11242 https://doi.org/10.1007/s11242-006-9083-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11242-006-9083-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen Guangjing Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia, Barcelona, Spain aut NATIONALLICENCE 700 1- Gallipoli Domenico School of Engineering, Durham University, Durham, UK aut NATIONALLICENCE 700 1- Ledesma Alberto Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia, Barcelona, Spain aut NATIONALLICENCE 773 0- Transport in Porous Media Kluwer Academic Publishers 69/2(2007-09-01), 189-213 0169-3913 69:2<189 2007 69 11242 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer