The effect of stress state factor on fracture of sandstones under true triaxial loading

Experimental results on rock deformation and fracture under true triaxial compression have revealed a misfit between strain state and stress state, strain state varying from generalized compression to generalized shear at σ 3 ≠ 0. This misfit can lead to data misinterpretation during the stress fiel...

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Bibliographic Details
Published in:International journal of fracture 2008, Vol.149 (1), p.1-10
Main Authors: Alexeev, A. D., Revva, V. N., Bachurin, L. L., Prokhorov, I. Y.
Format: Article
Language:English
Subjects:
Automotive Engineering
Characterization and Evaluation of Materials
Chemistry and Materials Science
Civil Engineering
Classical Mechanics
Compressive properties
Deformation
Dilatancy
Embrittlement
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Hydrostatic pressure
Materials Science
Mechanical Engineering
Original Paper
Physics
Porosity
Sandstone
Solid mechanics
Static elasticity (thermoelasticity...)
Strain
Stress distribution
Stress state
Structural and continuum mechanics
Transverse shear
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Summary:Experimental results on rock deformation and fracture under true triaxial compression have revealed a misfit between strain state and stress state, strain state varying from generalized compression to generalized shear at σ 3 ≠ 0. This misfit can lead to data misinterpretation during the stress field reconstruction after unloading. Fracture of rock specimens under true triaxial compression occurs by a combined longitudinal/transverse shear and produces the highest dilatancy. An increase in the hydrostatic pressure level diminishes limiting values of shear strains and suppresses the dilatancy effect. A maximum of dilatancy coincides with a maximum of fresh surface area formed during the fracture of the rock. The generalized cleavage of rocks becomes energetically disadvantageous in a true triaxial compressive stress field. Some sandstone becomes more brittle under true triaxial compression (σ 2  ≠ 0) at low values of the minimal stress component (σ 3 ) due to high initial porosity and dilatancy.
ISSN:0376-9429
1573-2673
DOI:10.1007/s10704-008-9214-6