TY - GEN
T1 - Aseismic slip propagation in fractured rock masses driven by pore-fluid diffusion
AU - Ciardo, F.
AU - Lecampion, B.
N1 - Publisher Copyright:
© 2021 ARMA, American Rock Mechanics Association.
PY - 2021
Y1 - 2021
N2 - We address the coupled hydro-mechanical problem of fluid injection in a fractured rock mass in the limit of negligible matrix hydraulic diffusivity. The fact that fluid-induced aseismic slip may outpace pore-fluid diffusion along a planar fault is also valid in the case of fluid injection into a Discrete Fracture Network. Upon revisiting the problem of self-similar fluid driven shear crack propagation on a planar fault under critically stressed and marginally pressurized regimes, we show via numerical simulations that a critically stressed DFN exhibits fast aseismic slipping path that migrates away from both injection point and fluid front location. This scenario persists regardless the geometrical connectivity of the DFN, since elastic stress interactions between active fractures represents the main driving force for such fast slip propagation. On the other hand, the opposite scenario occurs on a marginally pressurized DFN, where the aseismic slip front is localized near the injection point and well within the pressurized region.
AB - We address the coupled hydro-mechanical problem of fluid injection in a fractured rock mass in the limit of negligible matrix hydraulic diffusivity. The fact that fluid-induced aseismic slip may outpace pore-fluid diffusion along a planar fault is also valid in the case of fluid injection into a Discrete Fracture Network. Upon revisiting the problem of self-similar fluid driven shear crack propagation on a planar fault under critically stressed and marginally pressurized regimes, we show via numerical simulations that a critically stressed DFN exhibits fast aseismic slipping path that migrates away from both injection point and fluid front location. This scenario persists regardless the geometrical connectivity of the DFN, since elastic stress interactions between active fractures represents the main driving force for such fast slip propagation. On the other hand, the opposite scenario occurs on a marginally pressurized DFN, where the aseismic slip front is localized near the injection point and well within the pressurized region.
UR - http://www.scopus.com/inward/record.url?scp=85122919760&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85122919760&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85122919760
T3 - 55th U.S. Rock Mechanics / Geomechanics Symposium 2021
BT - 55th U.S. Rock Mechanics / Geomechanics Symposium 2021
PB - American Rock Mechanics Association (ARMA)
T2 - 55th U.S. Rock Mechanics / Geomechanics Symposium 2021
Y2 - 18 June 2021 through 25 June 2021
ER -