Fracture of sedimentary rocks under a complex triaxial stress state

Most sedimentary rocks have layered structure, and their strength properties are therefore anisotropic; as a consequence, the rock strength depends on the direction of the applied stresses. In this case, various fracture mechanisms are possible. The following two possible fracture mechanisms are con...

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Bibliographic Details
Published in:Mechanics of solids 2016-09, Vol.51 (5), p.522-526
Main Authors: Karev, V. I., Klimov, D. M., Kovalenko, Yu. F., Ustinov, K. B.
Format: Article
Language:English
Subjects:
Alloys
Axial stress
Classical Mechanics
Fracture mechanics
Fracturing
Natural gas
Physics
Physics and Astronomy
Planes
Qualitative analysis
Sedimentary rocks
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Summary:Most sedimentary rocks have layered structure, and their strength properties are therefore anisotropic; as a consequence, the rock strength depends on the direction of the applied stresses. In this case, various fracture mechanisms are possible. The following two possible fracture mechanisms are considered: actions along the bedding planes, which are weakening surfaces, and along the planes where stresses exceeding the total rock strength are attained. A triaxial independent loading test bench was used to study the fracture conditions for layered rocks composed of productive oil-and-gas strata in complex true triaxial loading tests. The study shows a good qualitative agreement between experimental results and theoretical estimates.
ISSN:0025-6544
1934-7936
DOI:10.3103/S0025654416050022