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- Title
The effect of stress state factor on fracture of sandstones under true triaxial loading.
- Authors
Alexeev, A. D.; Revva, V. N.; Bachurin, L. L.; Prokhorov, I. Y.a
- Abstract
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 σ3 ≠ 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 (σ2 ≠ 0) at low values of the minimal stress component (σ3) due to high initial porosity and dilatancy.
- Subjects
ROCK deformation; CLEAVAGE of rocks; SANDSTONE; STRAINS &; stresses (Mechanics); MATERIALS compression testing; SHEAR (Mechanics)
- Publication
International Journal of Fracture, 2008, Vol 149, Issue 1, p1
- ISSN
0376-9429
- Publication type
Article
- DOI
10.1007/s10704-008-9214-6