Failure patterns caused by localized rise in pore-fluid overpressure and effective strength of rocks

Details Failure patterns caused by localized rise in pore-fluid overpressure and effective strength of rocks Failure patterns caused by localized rise in pore-fluid overpressure and effective strength of rocks

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3422304r&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 22, CiteID L22304

Physics

Geophysics

8

Nonlinear Geophysics: Pattern Formation, Structural Geology: Role Of Fluids, Structural Geology: Mechanics, Theory, And Modeling, Physical Properties Of Rocks: Fracture And Flow, Tectonophysics: Dynamics And Mechanics Of Faulting (8004)

Scientific paper

In order to better understand the interaction between pore-fluid overpressure and failure patterns in rocks we consider a porous elasto-plastic medium in which a laterally localized overpressure line source is imposed at depth below the free surface. We solve numerically the fluid filtration equation coupled to the gravitational force balance and poro-elasto-plastic rheology equations. Systematic numerical simulations, varying initial stress, intrinsic material properties and geometry, show the existence of five distinct failure patterns caused by either shear banding or tensile fracturing. The value of the critical pore-fluid overpressure p c at the onset of failure is derived from an analytical solution that is in excellent agreement with numerical simulations. Finally, we construct a phase-diagram that predicts the domains of the different failure patterns and p c at the onset of failure.

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