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Self-Sealing Capacity of Macro-Cracked Argillite under Confinement
The drilling of storage tunnels generates an Excavated Damaged Zone, where clay-rock properties could change due to the presence of fractures. It's also expected that underground water seepage will contribute to argillite self-sealing. To simulate fractures responses to water seepage and mechanical loading, experimental procedures are developed on fractured samples. The specimen is then placed in a triaxial cell and the device is connected to four LVDT sensors which provide information about argillite deformation due to swelling or crushing. Under 3 MPa confining pressure, LVDT sensors exhibit the crushing of the macro-cracked sample. After water injection at a flow rate of 0.05 mL/min, the sample water permeability decreases rapidly to reach a value close to undisturbed sample permeability Kw=8.7 10-20m2 . When gas is injected, the permeability increases. At the end of experiment, the fracture was visualized using a 3D optical microscope highlighting its complete closure and the self-sealing phenomenon.
Self-Sealing Capacity of Macro-Cracked Argillite under Confinement
The drilling of storage tunnels generates an Excavated Damaged Zone, where clay-rock properties could change due to the presence of fractures. It's also expected that underground water seepage will contribute to argillite self-sealing. To simulate fractures responses to water seepage and mechanical loading, experimental procedures are developed on fractured samples. The specimen is then placed in a triaxial cell and the device is connected to four LVDT sensors which provide information about argillite deformation due to swelling or crushing. Under 3 MPa confining pressure, LVDT sensors exhibit the crushing of the macro-cracked sample. After water injection at a flow rate of 0.05 mL/min, the sample water permeability decreases rapidly to reach a value close to undisturbed sample permeability Kw=8.7 10-20m2 . When gas is injected, the permeability increases. At the end of experiment, the fracture was visualized using a 3D optical microscope highlighting its complete closure and the self-sealing phenomenon.
Self-Sealing Capacity of Macro-Cracked Argillite under Confinement
Ghayaza, M. (Autor:in) / Skoczylas, F. (Autor:in) / Robinet, J. C. (Autor:in) / Talandier, J. (Autor:in)
Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria
Poromechanics V ; 1580-1589
18.06.2013
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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