Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11016550 | International Journal of Solids and Structures | 2018 | 61 Pages |
Abstract
This study presents the development of a thermodynamics-based constitutive model for describing the macro-mechanical behaviour of porous rocks. The model formulation is developed within the well-established framework of generalised thermodynamics, or thermodynamics with internal variables (TIV), in order to guarantee the thermodynamics admissibility of the results. A new way for coupling different mechanisms of energy dissipation is proposed within the framework of TIV, so that the essential aspects of macro-mechanical behaviour of porous rocks ranging from brittle to ductile, dilation and compaction, as well as various modes of localised failure, under shearing at a wide range of confining pressures are correctly captured. The pressure sensitive behaviour of porous rocks is captured by introducing a shift stress in the formulation of the yield function, through the concept of 'frozen elastic energy' or non-dissipative part of the plastic work, which is stored within the material during loading. The proposed model allows the investigation of several important aspects of macro-mechanical behaviour of porous rocks at both material and specimen levels.
Related Topics
Physical Sciences and Engineering
Engineering
Civil and Structural Engineering
Authors
Arash Mir, Giang D. Nguyen, Abdul Hamid Sheikh,