Dynamically induced spatial variations of pore pressure and the meaning of Terzhagi‘s effective stress Conference Paper uri icon


  • Terzaghi's principle of effective stress [1] states that deformation and shear resistance of fluid- saturated porous and granular material are the result of changes in the effective stress, which is a linear combination of the externally applied confining stress and the internal pressure of the pore fluid. The validity of Terzaghi's principle has been demonstrated in simple macro-scale systems [2]. However, when attempting to apply the effective stress concept to natural complex systems, two fundamental questions arise: What is the range of scales over which Terzaghi's principle is valid?, and how should the effective stress be defined when the fluid pressure is not homogeneous throughout the domain of interest? In order to address these questions, we develop a micro-mechanical model of fluid-saturated granular layer that can undergo both elastic and plastic deformation in response to …

publication date

  • April 1, 2013