Characterizing damage evolution and yield surfaces for Berea sandstone under triaxial loading as a function of effective pressure Conference Paper uri icon


  • Copyright (2014) ARMA, American Rock Mechanics Association Granular porous material is idealized as an elastic-plastic material, where macroscopic failure occurs at a critical stress by localized dilatant shear at low effective pressure and compactional cataclastic flow at high effective pressure. Yielding and accumulation of microscopic damage at sub-critical stress levels are also important characteristics of the failure process. Here, load- reload triaxial compression tests are used to investigate damage development at low and high effective pressures, and test models of yield across the brittle-ductile transition. Water saturated cylinders of Berea sandstone were deformed at an axial strain rate of 10-5 s-1 and effective pressures of 20-240 MPa to investigate the dilational, transitional, and compactional regimes. Results illustrate that contours of equivalent damage for sub-critical stress states between yield and macroscopic failure are sub-parallel to the failure envelope except in the highest pressure regime. Damage induced at one effective pressure has a systematic, but variable effect on failure at other effective pressure conditions. The behavior across the transition from dilation to compaction is most consistent with a model based on two distinct yield envelopes, each associated with distinct damage mechanisms and a sharp transition between the low and high pressure regimes.

published proceedings

  • 48th US Rock Mechanics / Geomechanics Symposium 2014

author list (cited authors)

  • Choens, R. C., & Chester, F. M

complete list of authors

  • Choens, RC||Chester, FM

publication date

  • January 2014