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Response of a circular opening in a friable low‐permeability medium to temperature and pore pressure changes
Author(s) -
Wang Yarlong,
Dusseault Maurice B.
Publication year - 1995
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.1610190302
Subject(s) - borehole , materials science , porous medium , permeability (electromagnetism) , isothermal process , plane stress , pore water pressure , stress (linguistics) , effective stress , geotechnical engineering , plasticity , displacement (psychology) , mechanics , constitutive equation , composite material , porosity , geology , finite element method , thermodynamics , structural engineering , engineering , chemistry , psychology , biochemistry , physics , linguistics , philosophy , membrane , psychotherapist
A general analysis using an incremental elastic, perfectly plastic constitutive stress–strain relationship for poroelastoplastic materials is presented to simulate an opening in a low‐permeability friable porous medium under non‐isothermal conditions. Analytical solutions are obtained for the stresses and strains around a 2‐D plane strain circular borehole. An expansion potential is introduced by combining the strains induced by temperature and pore pressure changes. Steady‐state pressures and temperatures are considered, and a non‐associated plastic flow rule is applied to calculate plastic strains. Focusing on stress distribution near a circular opening, the classic solutions for those stresses under dry and isothermal conditions are used to compare with the newly derived solution. The general poroelastoplastic effect and the thermal effect on sand production and borehole stability are addressed. We suggest that the knowledge of stress history is critical to achieve adequate solutions for displacement and stress in friable media such as clays, shales and oil sands.