Article (Scientific journals)
Influence of evaporation and seepage on the convergence of a ventilated cavity
Gerard, Pierre; Charlier, Robert; Chambon, René et al.
2008In Water Resources Research, 44
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Keywords :
Hydro-mechanical coupling; Nuclear waste disposal; seepage condition
Abstract :
[en] In the design of nuclear waste disposals, an important topic concerns the development of an excavated damage zone, where permeability increases. A correct numerical prediction of the coupled processes occurring during excavation is therefore needed. In this paper, a nonclassical hydraulic boundary condition is described. It mixes two modes of water exchanges in partial saturation: seepage and evaporation flows. Seepage flow avoids unphysical water inflow into the rock mass, which might be obtained with usual boundary condition in dilatant geomaterial. Evaporation flows enable the thermodynamical equilibrium between air relative humidity in the cavity and in the rock mass. The numerical modeling of a cavity excavation in dilatant geomaterial is carried out. The results show the influence of the hydraulic boundary condition on the convergence of the cavity. Depending on the value of the transfer coefficient, the proposed numerical model can recover the results obtained with an imposed atmospheric pressure or suction at the cavity wall. The determination of the mass transfer coefficient is thus needed and can be achieved through drying experiments or can be estimated thanks to in situ measurements.
Disciplines :
Civil engineering
Author, co-author :
Gerard, Pierre ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Mécanique des sols et des roches & infrastructures - Géomécanique et géologie de l'ingénieur
Charlier, Robert ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géomécanique et géologie de l'ingénieur
Chambon, René;  Université Joseph Fourier Grenoble > Laboratoire 3S-R
Collin, Frédéric  ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géomécanique et géologie de l'ingénieur
Language :
English
Title :
Influence of evaporation and seepage on the convergence of a ventilated cavity
Publication date :
2008
Journal title :
Water Resources Research
ISSN :
0043-1397
eISSN :
1944-7973
Publisher :
American Geophysical Union, Washington, United States - District of Columbia
Volume :
44
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Projet Européen TIMODAZ
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 12 August 2008

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