Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 143, Issue -, Pages 218-231Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2018.03.011
Keywords
Rock; Damage; Microfracture; Porosity; Eshelby stress; Drucker-Prager
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Geosciences Research Program [DE-FG02-03ER15454]
- National Science Foundation [CMMI-1462231]
- Stanford University James M. Gere Research Fellowship
- Directorate For Engineering [1462231] Funding Source: National Science Foundation
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Relations between porosity, damage, and bulk plasticity are examined in the context of continuum damage and hyper-elastoplasticity of porous rocks. Attention is given to a thermodynamically consistent derivation of the damage evolution equations and their role in the constitutive equations, for which the Eshelby stress is found to be important. The provided phenomenological framework allows for volumetric damage associated with pore growth to be distinguished from the isochoric damage associated with distributed microcracks, and a novel Drucker-Prager/cap type material model that includes damage evolution is presented. The model is shown to capture well the hardening/softening behavior and pressure dependence of the so-called brittle-ductile transition by comparison with confined triaxial compression measurements from the literature. Non-linear finite element simulations are also provided of the prediction of damage within porous limestone around a horizontal borehole wall. (C) 2018 Elsevier Ltd. All rights reserved.
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