TY - JOUR
T1 - Gas migration in a Cenozoic clay
T2 - Experimental results and numerical modelling
AU - Gonzalez-Blanco, Laura
AU - Romero, Enrique
AU - Jommi, Cristina
AU - Li, Xiangling
AU - Sillen, Xavier
PY - 2016/6/1
Y1 - 2016/6/1
N2 - Gas migration through a potential host clay formation for the geological disposal of radioactive waste in Belgium is experimentally investigated in the laboratory, and numerical modelling is performed to help in the interpretation of the results. Selected air injection tests under oedometer conditions on initially saturated Boom Clay samples with oriented bedding planes are presented. Priority in the experimental programme is given to the study of the deformation response along the injection and dissipation stages, as well as to the analysis of the pore network changes, which detect the opening of fissures that can act as preferential air pathways. The experimental results are simulated using a fully coupled hydro-mechanical finite element code, which incorporates an embedded fracture permeability model to account for the simulation of the gas flow along preferential pathways. The intrinsic permeability and the retention curve of the clay are assumed to be dependent on strains through fracture aperture changes. The numerical results could reproduce upstream/downstream pressures, outflow volume and soil volume change accurately. The experimental results, combined with the numerical simulation, provide good insight into the role of the volumetric response and of the bedding planes on the air transport properties of Boom Clay samples, confirming that fracture aperture occurs during gas injection, which eventually dominates further injection and pressure release stages.
AB - Gas migration through a potential host clay formation for the geological disposal of radioactive waste in Belgium is experimentally investigated in the laboratory, and numerical modelling is performed to help in the interpretation of the results. Selected air injection tests under oedometer conditions on initially saturated Boom Clay samples with oriented bedding planes are presented. Priority in the experimental programme is given to the study of the deformation response along the injection and dissipation stages, as well as to the analysis of the pore network changes, which detect the opening of fissures that can act as preferential air pathways. The experimental results are simulated using a fully coupled hydro-mechanical finite element code, which incorporates an embedded fracture permeability model to account for the simulation of the gas flow along preferential pathways. The intrinsic permeability and the retention curve of the clay are assumed to be dependent on strains through fracture aperture changes. The numerical results could reproduce upstream/downstream pressures, outflow volume and soil volume change accurately. The experimental results, combined with the numerical simulation, provide good insight into the role of the volumetric response and of the bedding planes on the air transport properties of Boom Clay samples, confirming that fracture aperture occurs during gas injection, which eventually dominates further injection and pressure release stages.
KW - Coupled hydro-mechanical response
KW - Deep clay
KW - Discontinuities opening
KW - Gas transport
KW - Microstructure analysis
KW - Preferential air flow
UR - http://www.scopus.com/inward/record.url?scp=84973855894&partnerID=8YFLogxK
U2 - 10.1016/j.gete.2016.04.002
DO - 10.1016/j.gete.2016.04.002
M3 - Article
AN - SCOPUS:84973855894
SN - 2352-3808
VL - 6
SP - 81
EP - 100
JO - Geomechanics for Energy and the Environment
JF - Geomechanics for Energy and the Environment
ER -